SMC Networks D-A72H, D-A73H, D-A76H, D-A80H, D-A73C User Manual

Auto Switch Guide

Reed Switches/Solid State Switches

For Air Grippers (Rotary Actuators)

Applicable Auto Switch

Type

mounting

Reed switchSolid state switch

2-color

indication

2-color

indication

Auto

switch

Rail

Direct

Rail

Tie-rod

Rail

Direct

Rail

Direct

Tie-rod

Electrical

entry

Grommet

Connector

Grommet

Grommet

Connector

Grommet

Grommet

Grommet

Connector

Grommet

Grommet

Connector

Grommet

Grommet

Grommet

Grommet

Auto switch model

D-A72/A73/A80

D-A72H/A73H
D-A76H/A80H

D-A73C/A80C

D-A53/A54/A56

D-A64/A67

D-A90/A93/A96

D-A90V/A93V/A96V

D-90A/93A

D-R731/R732

D-R801/R802

D-R731C/R732C

D-R801C/R802C

D-A79W

D-A59W

D-F79/F7P/J79

D-F7NV/F7PV/F7BV

D-F59/F5P/J51/J59

D-S991/S992/S99V1/S99V2

D-T991/T992/T99V1/T99V2

D-S9P1/S9P2/S9PV1/S9PV2

D-S791/S792

D-T791/T792

D-S7P1/S7P2

D-T791C/T792C

D-F8N/F8P/F8B

D-M9N/M9P/M9B

D-M9NV/M9PV/M9BV

D-Y59A/Y7P/Y59B

D-Y69A/Y7PV/Y69B

D-F79W/F7PW/J79W

D-Y7NW/Y7PW/Y7BW

D-Y7NWV/Y7PWV/Y7BWV

D-F9NW/F9PW/F9BW

D-F9NWV/F9PWV/F9BWV

D-F59W/F5PW/J59W

D-90/97

D-J79C

Applicable rotary actuators

Size

CDRA1 CDRB CDRQ2
30 50-100 10/15 20-100 10/15 20-40 32/40 1/3 7/20 10-200 10-25 10-25 10-2510-40 10-30 16-25 32-125 10-25 32-63 20-50

MRQ

MDSUB

MSQ

MHZ2 MHZJ2

Applicable air grippers

Size

MHL2 MDHR MHS

MHK MHS MHC2 MHT2
12-25

MHW2

MHY MRHQ
10-25

Page

12-13-7

12-13-8

12-13-9

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—

12-13-10

—

—

—

—

—

12-13-11

—

12-13-12

12-13-13

12-13-14

—

—

—

—

—

—

—

—

12-13-15

12-13-16

12-13-17

12-13-18

12-13-19

12-13-20

—

1

MHZ

MHF

MHL

MHR

MHK

MHS

MHC

MHT

MHY

MHW

MRHQ

Misc.

D-

20-

Rail

2-color indication

With diagnosis output

Rail

Tie-rod

Direct

Water resistant

2-color indication

Rail

Tie-rod

With timer

Note) As for the applicable auto switches on Rotary Actuators, refer to pages in Best Pneumatics Vol. 11.

Grommet

Grommet

Grommet

D-F79F

D-F59F

D-F7BAL/F7BAVL

D-F5BAL

D-Y7BAL

D-F9BAL

D-F7NTL

D-F5NTL

12-13-21

—

12-13-22

—

12-13-24

12-13-23

—

—

12-13-1

1. Check the specifications.

Read the specifications carefully and use this product
appropriately. The product may be damaged or malfunction if it
is used outside the range of specifications of current current,
voltage, temperature or impact.

2. Use caution when multiple cylinders are used
and close to each other.

When two or more auto switch cylinders are lined up in close
proximity to each other, magnetic field interference may cause
the switches to malfunction. Maintain a minimum cylinder
separation of 40 mm. (When the allowable interval is specified
for each cylinder series, use the indicated value.)

3. Use caution to the ON time of a switch at the
intermediate position of stroke.

When an auto switch is placed at an intermediate position of
the stroke and a load is driven at the time the piston passes,
the auto switch will operate, but if the speed is too great, the
operating time will be shortened and the load may not operate
properly. The maximum detectable piston speed is:

In cases of high piston speed, the use of an auto switch (D­F5NT/F7NT/G5NT and M5T) with a built-in OFF delay timer
(≅ 200 ms) makes it possible to extend the load operating time.

4. Wiring should be kept as short as possible.

<Reed switches>
As the length of the wiring to a load gets longer, the rush
current at switching ON becomes greater, and this may
shorten the product’s life. (The switch will stay ON all the time.)

1) For an auto switch without a connect protection circuit, use

a contact protection box when the wire length is 5 m or
longer.

2) Even if an auto switch has a built-in contact protection

circuit, when the wiring is more than 30 m long, it is not able
to adequately absorb the rush current and its life may be
reduced. It is again necessary to connect a contact
protection box in order to extend its life. Please contact
SMC in this case.

<Solid state switches>

3) Although wire length should not affect switch function, use a

wire 100 m or shorter.

5. Use caution to the internal voltage drop of a
switch.

<Reed switches>

1) Switches with an indicator light (Except D-A56/A76H/A96/

A96V/C76/E76A/Z76)

• If auto switches are connected in series as shown below,

take note that there will be a large voltage drop because of
internal resistance in the light emitting diodes. (Refer to
internal voltage drop in the auto switch specifications.)
[The voltage drop will be “n” times larger when “n” auto
switches are connected.]
Even though an auto switch operates normally, the load
may not operate.

• Similarly, when operating below a specified voltage, it is
possible that the load may be ineffective even though the
auto switch function is normal. Therefore, the formula below
should be satisfied after confirming the minimum operating
voltage of the load.

2) If the internal resistance of a light emitting diode causes a
problem, select a switch without an indicator for right
(MODEL D-A6/A80/A80H/A90/A90V/C80/R80/90/E80A/
Z80)

<Solid state switches>

3) Generally, the internal voltage drop will be greater with a 2­wire solid state auto switch than with a reed switch. Take
the same precautions as in 1).
Also note that a 12 VDC relay is not applicable.

6. Use caution to the leakage current.

<Solid state switches>
With a 2-wire solid state auto switch, current (leakage current)
flows to the load to operate the internal circuit even when in
the OFF state.

If the condition given in the above formula is not met, it will not
reset correctly (stays ON). Use a 3-wire switch if this
specification cannot be satisfied.
Moreover, leakage current flow to the load will be “n” times
larger when “n” auto switches are connected in parallel.

7. Do not use a load that generates surge voltage.

<Reed switches>
If driving a load such as a relay that generates a surge
voltage, use a switch with a built-in contact protection circuit or
use a contact protection box.
<Solid state switches>
Although a zener diode for surge protection is connected at
the output side of a solid state auto switch, damage may still
occur if the surge is applied repeatedly. When a load, such as
a relay or solenoid, which generates surge is directly driven,
use a type of switch with a built-in surge absorbing element.

8. Cautions for use in an interlock circuit

When an auto switch is used for an interlock signal requiring
high reliability, devise a double interlock system to avoid
trouble by providing a mechanical protection function, or by
also using another switch (sensor) together with the auto
switch.
Also perform periodic maintenance inspections and confirm
proper operation.

9. Ensure sufficient space for maintenance
activities.

When designing an application, be sure to allow sufficient
space for maintenance and inspection.

Design and Selection

V (mm/s) =

Auto switch operating range (mm)

Load operating time (ms)

x 1000

Load

Supply
voltage

–

Internal voltage
drop of switch

>

Minimum operating
voltage of load

Current to operate load (OFF condition) > Leakage current

Warning

Auto Switches

Precautions 1

Be sure to read before handling.
For detailed precautions on every series, refer to main text.

2

12-13-2

Auto Switches

Precautions 2

Be sure to read before handling.
For detailed precautions on every series, refer to main text.

3

Mounting and Adjustment

Warning

1. Do not drop or bump.

Do not drop, bump, or apply excessive impacts (300 m/s2 or
more for reed switches and 1000 m/s
switches) while handling. Although the body of the switch may
not be damaged, the inside of the switch could be damaged
and cause a malfunction.

2

or more for solid state

2. Do not carry a cylinder by the auto switch lead
wires.

Never carry a cylinder by its lead wires. This may not only
cause broken lead wires, but it may cause internal elements of
the switch to be damaged by the stress.

3. Mount switches using the proper tightening
torque.

When a switch is tightened beyond the range of fastening
torque, the mounting screws or switch may be damaged.
On the other hand, tightening below the range of fastening
torque may alllow the switch to slip out of position. (Refer to
switch mounting for each series regarding switch mounting,
moving, and fastening torque, etc.)

4. Mount a switch at the center of the operating
range.

Adjust the mounting position of an auto switch so that the
piston stops at the center of the operating range (the range in
which a switch is ON). (The mounting positions shown in the
catalog indicate the optimum position at the stroke end.) If
mounted at the end of the operating range (around the
borderline of ON and OFF), the operation will be unstable.

Wiring

Warning

1. Avoid repeatedly bending or stretching lead
wires.

Broken lead wires will result from repeatedly applying bending
stress or stretching force to the lead wires.

2. Be sure to connect the load before power is
applied.

<2-wire type>
If the power is turned on when an auto switch is not connected
to a load, the switch will be instantly damaged because of
excess current.

3. Confirm proper insulation of wiring.

Be certain that there is no faulty wiring insulation (contact with
other circuits, ground fault, improper insulation between
terminals, etc.). Damage may occur due to excess current flow
into a switch.

4. Do not wire with power lines or high voltage
lines.

Wire separately from power lines or high voltage lines,
avoiding parallel wiring or wiring in the same conduit with
these lines. Control circuits including auto switches may
malfunction due to noise from these other lines.

5. Do not allow short circuiting of loads.

<Reed switches>
If the power is turned on with a load in a short circuited
condition, the switch will be instantly damaged because of
excess current flow into the switch.

<Solid state switches>
Model D-F9(Y)/F9W(V)/J51/G5NB and all models of PNP
output switches do not have built-in short circuit prevention
circuits. If loads are short circuited, the switches will be
instantly damaged.
Use caution to avoid reverse wiring with the brown [red] power
supply line and the black [white] output line on 3-wire type
switches.

6. Avoid incorrect wiring.

<Reed switches>

A 24 VDC switch with indicator light has polarity. The brown
lead wire or terminal no. 1 is (+), and the blue lead wire or

terminal no. 2 is (–).
[In the case of model D-97, the side without indicator is (+),
and the black line side is (–).]

1) If connections are reversed, a switch will operate, however,

the light emitting diode will not light up.

Also note that a current greater than the maximum

specified one will damage a light emitting diode and make it

inoperable.

Applicable models:

D-A73/A73H/A73C/C73/C73C/E73A/Z73/R73

D-97/93A/A93/A93V

D-A33/A34/A33A/A34A/A44/A44A

D-A53/A54/B53/B54

2) However, when using a two color indication auto switch, the

switch (D-A79W/A59W/B59W), be aware that the switch

will constantly remain ON if the connections are reversed.
<Solid state switches>

1) If connections are reversed on a 2-wire type switch, the

switch will not be damaged if protected by a protection

circuit, but the switch will always stay in an ON state.

However, it is still necessary to avoid reversed connections,

since the switch could be damaged by a load short circuit in

this condition.

2) If connections are reversed (power supply line (+) and

power supply line (–) on a 3-wire type switch, the switch will

be protected by a protection circuit. However, if the power

supply line (+) is connected to the blue (black) wire and the

power supply line (–) is connected to the black (white) wire,

the switch will be damaged.

∗ Lead wire color changes

Lead wire colors of SMC auto switches have been changed in
order to meet NECA Standard 0402 for production beginning
September, 1996 and thereafter. Please refer to the tables
provided.

2-wire 3-wire

Old

Red

Black

White

Yellow

New

Brown

Blue

New

Brown

Blue

Black

Orange

Power supply (+)
Power supply GND
Output

Solid State with
Latch Type Diagnostic Output

Power supply (+)
Power supply GND
Output
Latch type

diagnostic output

Old
Output (+)
Output (–)

Red

Black

Solid State
with Diagnostic Output

Power supply (+)
Power supply GND
Output
Diagnostic output

Old

Red
Black
White

Old

Red
Black
White

Yellow

New

Brown

Blue

Black

New

Brown

Blue

Black

Orange

MHZ

MHF

MHL

MHR

MHK

MHS

MHC

MHT

MHY

MHW

MRHQ

Misc.

D-

20-

12-13-3

1. Never use in the presence of explosive gases.

The construction of our auto switches does not make them
explosion-proof. Never use them in the presence of an
explosive gas, as this may cause a serious explosion.

2. Do not use in an area where a magnetic field is
generated.

Auto switches will malfunction or magnets inside cylinders will
become demagnetized. (Please consult with SMC regarding
the availability of a magnetic field resistant auto switch.)

3. Do not use in environments where the auto
switches will be constantly exposed to water.

Although switches except D-A3/A44/G39/K39 satisfy the
IEC standard IP67 structure (JIS C 0920: anti-immersion
structure), do not use switches in applications where
continually exposed to water splash or spray. Poor insulation
or swelling of the potting resin inside switches may cause
malfunction.

4. Do not use in environments with oil or
chemicals.

Please consult with SMC if auto switches will be used in an
environment with coolants, cleaning solvents, various oils or
chemicals. If auto switches are used under these conditions
for even a short time, they may be adversely affected by
improper insulation, a malfunction due to swelling of the
potting resin, or hardening of the lead wires.

5. Do not use in an environment with temperature
cycles.

Please consult with SMC if switches are to be used where
there are temperature cycles other than normal temperature
changes, as they may be adversely affected internally.

6. Do not use in environments where there is
excessive impact shock.

<Reed switches>
When excessive impact (300 m/s

2

or more) is applied to a
reed switch during operation, the contact point may
malfunction and generate or cut off a signal momentarily (1 ms
or less). Please consult with SMC regarding the need to use a
solid state switch depending on the environment.

7. Do not use in locations where surges are
generated.

<Solid state switches>
When there are units (solenoid type lifters, high frequency
induction furnaces, motors, etc.) which generate a large
amount of surge in the area around cylinders with solid state
auto switches, this may cause deterioration or damage to the
switches. Avoid sources of surge generation and crossed lines.

8. Avoid accumulation of iron debris or close
contact with magnetic substances.

When a large amount of ferrous debris such as machining
chips or spatter is accumulated, or a magnetic substance
(something attracted by a magnet) is brought into close
proximity with an auto switch cylinder, it may cause the auto
switches to malfunction due to a loss of the magnetic force
inside the cylinder.

Operating Environment

1. Perform the following maintenance periodically
in order to prevent possible danger due to
unexpected auto switch malfunction.

1) Securely tighten switch mounting screws.

If screws become loose or the mounting position is
dislocated, retighten screws securely after readjusting the
mounting position.

2) Confirm that there is no damage to lead wires.

To prevent faulty insulation, replace switches or repair lead
wires if damage is discovered.

3) Confirm that the green light on the 2-color indicator type

switch lights up.
Confirm that the Green LED is ON when stopped at the set
position. If the Red LED is ON when stopped at the set
position, the mounting position is not appropriate. Readjust
the mounting position until the Green LED lights up.

Maintenance

1. Please consult with SMC concerning water
resistance, elasticity of lead wires, and use at
welding sites.

Other

Warning

Warning

Warning

Auto Switches

Precautions 3

Be sure to read before handling.
For detailed precautions on every series, refer to main text.

4

12-13-4

Before Operation

Auto Switches Common Specifications

Precautions

Refer to “Auto Switches Precautions” on pages 12-13-2 to 12-13-4 before handling.

5

Auto Switches Common Specifications

Type

Leakage current

Operating time

Impact resistance

Insulation resistance

Withstand voltage

Ambient temperature

Enclosure

Reed switch

None

1.2 ms

2

300 m/s

50 MΩ or more at 500 M VDC (Between lead wire and case)

1500 VAC for 1 minute

(Between lead wire and case)

IEC529 Standard IP67, Immersible construction (JIS C 0920)

3-wire: 100 µA or less, 2-wire: 0.8 mA or less

(1)

–10 to 60°C

Solid state switch

1 ms or less

1000 m/s

1000 VAC for 1 minute

(Between lead wire and case)

Lead Wire Length

Lead wire length indication

(Example)

D-A73

L

Lead wire length

Nil

0.5 m

L

3 m

∗ Applicable for the connector

(Example)

type (D-

C) only.

D-F8PL-

5 m

Z

∗

None

N

Flexible lead wire

specifications

(D-Y59, D-Y69, D-Y7 and D-M9/M9V
series use flexible lead wire as srandard. )

Part No. of Lead Wires
with Connectors

(Applicable only for connector type)

Model

D-LC05

D-LC30

D-LC50

Lead wire length

0.5 m

3 m

5 m

•

61

•

Note 1)

Applicable auto switch with 5
m lead wire (“Z”)
Reed switch: D-B53/B54, D­C73(C)/C80C, D-A73(C)(H)/
A80C, D-A53/A54, D-Z73, D­90/97/90A/93A
Solid state switch:
Manufactured upon receipt of
order as standard.
The standard lead wire length

Note 2)

of solid state switches with
timer, water resistant 2-color
indication type, wide range
detection type or heat
resistant 2-color indication
type is 3 meters in length.
(0.5 m is not available.)

Note 3)

Lead wire lengths of 3 m and
5 m are standard for magnetic
field resistant 2-color indicator
type solid state switches. (0.5
m is not available.)
Add “-61” at th end of the part

Note 4)

number for the flexible lead
wire except D-Y59, D-Y69, D­Y7 and D-M9/M9V type
auto switches.

Auto Switch Hysteresis

Hysteresis is the distance between the position at which piston movement
operates an auto switch to the position at which reverse movement turns
the switch off. This hysteresis is included in part of the operating range
(one side).

Auto switch

Note 1)

Electrical entry: Connector type (A73C/A80C/C73C/C80C)
and D-9/9

(4)

(3)

2

Note 2)

Note 3)

Note 4)

(2)

Contact Protection Box:

1
<Applicable switch types>

D-A7/A8, D-A7H/A80H, D-A73C/A80C, D-C7/C8, D-C73C/C080C, D­E7A/E80A, D-Z7/Z8, D-9/9A, D-A9/A9V, and D-A79W type
The above auto switches do not have internal contact protection circuits.

1. Operating load is an inductive load.

2. The length of wiring to the load is 5 m or more.

3. The load voltage is 100 or 200 VAC.
A contact protection box should be used in any of the above
conditions, Unless using a contact protection box, the contact life may

be shortened. (Due to permanent energizing conditions.)

D-A72(H) must be used with the contact protection box regardless
of load styles and lead wire length.

2

Please contact SMC when using built-in contact protection circuit style (D­A34[A][C], D-A44[A][C], D-A54/A64, D-B54/B64, D-A59W, D-B59W) in the
following conditions: 1. The wiring length to load is more than 30 m; 2.

When using PLC with large flow current.

A/A9/A9V type: 1000 VAC/min. (Between

lead wire and the case)
The following switches, Terminal conduit type (D­A3/A3

A/A3C/G39/G39A/G39C/K39/K39A/K39C), DIN

terminal type (D-A44/A44A/A44C) and Heat resistant auto
switch (D-F7NJL) meet the IEC529 standard.
IP63, JIS C 0920 Rainproof construction
Except solid state switch with timer (D-M5
G5NTL/F7NTL/F5NTL) and magnetic resistant 2-color indi­cation type solid state switch (D-P5DWL). D-J51: 5 ms or
less
Except D-J51 (1 mA or less at 100 VAC, 1.5 mA or less at
200 VAC), D-M5NW/M5PW/M5BW, D-F9BAL, D-P5DWL (1
mA or less at 24 VDC).

TL,

CD-P11, CD-P12

Contact Protection Box Specifications

Part no.

Load voltage

Max. load current

∗ Lead wire length — Switch connection side 0.5 m

CD-P11

100 VAC or less

25 mA

Load connection side 0.5 m

200 VAC

12.5 mA

CD-P12

24 VDC

50 mA

Contact Protection Box Internal Circuit

CD-P11

CD-P12

Surge absorber

Zener diode

Choke

coil

Choke

coil

OUT Brown

~

OUT Blue

OUT (+) Brown

OUT (–) Blue

MHZ

MHF

MHL

MHR

MHK

MHS

MHC

MHT

MHY

MHW

MRHQ

Misc.

D-

20-

Switch
operating
position
(ON)

Switch
operating
position
(OFF)

Note) Hysteresis may fluctuate due to the operating environment.

Please contact SMC if hysteresis causes an operational problem.

Hysteresis

Reed switch: 2 mm or less
Solid state switch: 1 mm or less

Contact Protection Box/Dimensions

Note)

Contact Protection Box Connection

To connect a switch unit to a contact protection box, connect the lead wire
from the side of the contact protection box marked SWITCH to the lead
wire coming out of the switch unit. Keep the switch as close as possible to
the contact protection box, with a lead wire length of no more than 1
meter.

12-13-5

Before Operation

Auto Switches Connection and Example

Basic Wiring

Example of Connection with PLC (Programmable Logic Controller)

Example of AND (Series) and OR (Parallel) Connection

Solid state 3-wire, NPN Solid state 2-wireSolid state 3-wire, PNP

Main
curcuit
of switch

Brown

Black

Blue

Brown

Black

Blue

Brown

Blue

Brown

Blue

Reed switch 2-wire

Indicator
protection
circuit,
etc.

Brown

Blue

~

~

Brown

Blue

Indicator
protection
circuit,
etc.

• Sink input specifications
3-wire, NPN

• Source input specifications
3-wire, PNP

2-wire

Switch

Input

Black

COM

Brown

Blue

2-wire

Switch

Input

Black

PLC internal circuit

COM

Brown

Blue

PLC internal circuit

PLC internal circuit

Switch

Input

Blue

COM

Brown

PLC internal circuit

Switch

Input

Blue

COM

Brown

• 3-wire

OR connection for NPN output

2-wire with 2-switch AND connection 2-wire with 2-switch OR connection

Load voltage at ON = Power supply voltage – Residual voltage x 2 pcs.

= 24 V – 4 V x 2 pcs.
= 16 V

Example: Power supply is 24 VDC

Internal voltage drop in switch is 4 V.

Load voltage at OFF = Leakage current x 2 pcs. x Load impedance

= 1 mA x 2 pcs. x 3 kΩ
= 6 V

Example: Load impedance is 3 kΩ.

Leakage current from switch is 1 mA.

Switch 2

Switch 1

Load

Brown
Black
Blue

Brown
Black
Blue

Switch 1

Brown

Switch 2

Black
Blue

Relay

Relay

Brown
Black
Blue

Load

Relay
contact

Switch 1

Switch 2

Brown

Blue

Brown

Blue

Load

Switch 1

Switch 2

Brown

Blue

Brown

Blue

Load

AND connection for NPN output
(Using relays)

• 2-wire

Switch 1

Brown

Switch 2

Black
Blue

Load

Brown
Black
Blue

AND connection for NPN output
(Performed with switches only)

The indicator lights will light up when
both switches are turned ON.

When two switches are
connected in series, a load
may malfunction because
the load voltage will decline
when in the ON state.
The indicator lights will light
up when both of the
switches are in the ON
state.

(Solid state switch)

When two switches are
connected in parallel,
malfunction may occur
because the load voltage
will increase when in the
OFF state.

(Reed switch)

Because there is no
current leakage, the load
voltage will not increase
when turned OFF.
However, depending on
the number of switches in
the ON state, the
indicator lights may
sometimes grow dim or
not light up, due to the
dispersion and reduction
of the current flowing to
the switches.

Brown

Black

Blue

Main
curcuit
of switch

Main
curcuit
of switch

Main
curcuit
of switch

Main
curcuit
of switch

Connect according to the applicable PLC
input specifications, as the connection
method will vary depending on the PLC
input specifications.

(Power supply for switch and load are separate)

Load

Load

Load

Load

Load

Load

Load

6

12-13-6

Reed Switch
Band Mounting Style

D-A72/D-A73/D-A80

For details about certified products
conforming to international standards,
visit us at www.smcworld.com.

7

Grommet

Electrical entry: Perpendicular

Auto Switch Internal Circuit

D-A72

Contact protection box

LED

Resistor

Zener diode

Reed switch

Brown

Blue

CD-P11

Choke
coil

Surge
absorber

OUT
Brown

앑

OUT
Blue

D-A73

LED

Resistor

Zener diode

Reed switch

Brown

Blue

Contact
protection
box
CD-P11
CD-P12

OUT (
Brown

앑

OUT (–)
Blue

D-A80

OUT (±)
Brown

앑

OUT ( )
Blue

±

Reed switch

Contact
protection
box
CD-P11
CD-P12

Auto Switch Specifications

PLC: Abbreviation of Programmable Logic Controller

D-A7 (With indicator light)

Auto switch model

Applicable load

Load voltage

Load current range

Contact protection circuit

Internal voltage drop

Indicator light

(3)

D-A8 (Without indicator light)

Auto switch model

Applicable load

Load voltage

Maximum load current

Contact protection circuit

Internal resistance

• Lead wire — Oil resistant vinyl heavy-duty cord, ø3.4, 0.2 mm
Note 1) Regarding the common specifications of the reed switches, refer to page 12-13-5.
Note 2) Regarding the lead wire length, refer to page 12-13-5.
Note 3) Under 5 mA, the strength of the indicator light is poor. In some cases, visibility of the

indicator light will not be possible where the output signal is less than 2.5 mA. However,
there is no problem in terms of contact output, when an output signal exceeds 1 mA or
more.

D-A72

Relay, PLC

200 VAC

5 to 10 mA

24 VDC

5 to 40 mA

None

2.4 V or less

Red LED lights when ON.

D-A73

Relay, PLC

D-A80

AC

24 V or less

DC

50 mA 20 mA

1 Ω or less (Including lead wire length of 3 m)

Relay, IC circuit, PLC

AC

48 V

DC

40 mA

None

2

, 2 cores (Brown, Blue), 0.5 m

100 VAC

5 to 20 mA

AC

100 V

DC

MHZ

MHF

MHL

MHR

MHK

MHS

MHC

MHT

MHY

MHW

MRHQ

Misc.

Weight

D-

(g)

Auto switch model

Lead wire length

+)

(m)

0.5

3

5

D-A72

10

47

—

D-A73 D-A80

10

47

77

10

47

—

20-

Dimensions

Indicator light

D-A80 without

indicator light

15 (14)

23 (22)

Note 1) Operating load is an induction load.
Note 2) Wiring to the load is 5 m or longer.
Note 3) Load voltage is 100 VAC.
Use the contact protection box in any of the
above listed situations. The contact point life
may decrease. (Refer to page 12-13-5 for
contact protection box.)

6 (6.2) 3

9 (8.5)

( ) values for D-A72

Most sensitive position

12-13-7

Indicator light
D-A80H without

indicator light

Most sensitive position

Auto Switch Internal Circuit

D-A72H

D-A73H

D-A76H

D-A80H

Auto Switch Specifications

Dimensions

Auto switch model

0.5

3

5

10

47
—

10

47
—

11

52
—

10

47

77

D-A72H D-A73H D-A76H

D-A80H

D-A7H, D-A80H

Grommet

Electrical entry: In-line

Lead wire length

(m)

PLC: Abbreviation of Programmable Logic Controller

D-A7H (With indicator light)

Auto switch model

Applicable load

Load voltage

Max. load voltage/Load current range

(3)

Contact protection circuit

Internal voltage drop

Indicator light

24 VDC

5 to 40 mA

2.4 V or less

100 VAC

5 to 20 mA

D-A72H

Relay, PLC

200 VAC

5 to 10 mA

D-A76H

IC circuit

4 to 8 VDC

20 mA

0.8 V or less

D-A73H

Relay, PLC

None

Red LED lights when ON.

D-A80H

Relay, IC circuit, PLC

40 mA

None

1 Ω or less (Including lead wire length of 3 m)

D-A80H (Without indicator light)

Auto switch model

Applicable load

Load voltage

Maximum load current

Contact protection circuit

Internal resistance

50 mA 20 mA

24 V or less

AC
DC

48 V

AC
DC

100 V

AC
DC

LED

Reed switch

Resistor

Zener diode

Brown

Blue

OUT

(+)

Brown

앑

OUT (–)
Blue

LED

Reed switch

Resistor

Reverse
current
prevention
diode

OUT
Black

DC

(+)

Brown

DC

(–)

Blue

Load

(+)

(

–)

DC power
supply

Blue

LED

Reed switch

Resistor

Zener diode

Brown

OUT
Blue

OUT
Brown

Choke
coil

Contact protection box

CD-P11

Surge
absorber

앑

Reed switch

OUT (±)
Brown

앑

Note 1) Operating load is an induction load.
Note 2) In the case the wiring length to load is

more than 5 m.
Note 3) Wiring to the load is 5 m or longer.
Use the contact protection box in any of the
above listed situations. The contact point life
may decrease. Especially in the case of

D-A72H, be sure to use the contact
protection box. (Refer to page 12-13-5 for

contact protection box.)

• Lead wire — Oil resistant vinyl heavy-duty cord, 0.2 mm2, 2 cores (Brown, Blue), 3 cores (Brown,
Black, Blue), 0.5 m

Note 1) Regarding the common specifications of the reed switches, refer to page 12-13-5.
Note 2) Regarding the lead wire length, refer to page 12-13-5.
Note 3) Under 5 mA, the strength of the indicator light is poor. In some cases, visibility of the

indicator light will not be possible where the output signal is less than 2.5 mA. However,
there is no problem in terms of contact output, when an output signal exceeds 1 mA or
more.

Reed Switch
Rail Mounting Style

D-A7



H/D-A80H

OUT ( )
Blue

±

Contact
protection
box
CD-P11
CD-P12

Contact
protection
box
CD-P11
CD-P12

Weight

(g)

For details about certified products
conforming to international standards,
visit us at www.smcworld.com.

8

12-13-8

Reed Switch
Rail Mounting Style

D-A73C/D-A80C

For details about certified products
conforming to international standards,
visit us at www.smcworld.com.

9

Connector

Caution

Precautions

1. Confirm that the connector is appropriately

tightened. If tightened insufficiently, the
waterproof performance will deteriorate.

2. Refer to Best Pneumatics Vol. 6/7/8/9/10
for the details.

Auto Switch Internal Circuit

D-A73C

LED

Resistor

Zener diode

Reed switch

D-A80C

Contact protection box

CD-P12

Brown

Blue

Choke coil

Zener
diode

OUT (+)
Brown

(–)

OUT
Blue

Auto Switch Specifications

PLC: Abbreviation of Programmable Logic Controller

D-A73C (With indicator light)

Auto switch model

Applicable load

Load voltage

Load current range

Contact protection circuit

Internal voltage drop

Indicator light

(4)

D-A73C

Relay, PLC

24 VDC

5 to 40 mA

None

2.4 V or less

Red LED lights when ON.

D-A80C (Without indicator light)

Auto switch model

Applicable load

Load voltage

Maximum load current

Contact protection circuit

Internal resistance

• Lead wire — Oil resistant vinyl heavy-duty cord, ø3.4, 0.2 mm2, 2 cores (Brown, Blue), 0.5 m
Note 1) Regarding the common specifications of the reed switches, refer to page 12-13-5.
Note 2) Regarding the lead wire length, refer to page 12-13-5.
Note 3) Lead wire with connector may be shipped with switch.
Note 4) Under 5 mA, the strength of the indicator light is poor. In some cases, visibility of the

indicator light will not be possible where the output signal is less than 2.5 mA. However,
there is no problem in terms of contact output, when an output signal exceeds 1 mA or
more.

1 Ω or less (Including lead wire length of 3 m)

D-A80C

Relay, IC circuit, PLC

24 V

50 mA

None

AC

DC

Weight

(g)

Auto switch model

Lead wire length

(m)

0.5

3

5

D-A73C

12

54

84

D-A80C

12

54

84

MHZ

MHF

MHL

MHR

MHK

MHS

MHC

MHT

MHY

MHW

MRHQ

Misc.

D-

20-

Contact
protection
box
CD-P11

Reed switch

Note 1) Operating load is an induction load.
Note 2) Wiring to the load is 5 m or longer.
Use the contact protection box in any of the
above listed situations. The contact point life
may decrease. (Refer to page 12-13-5 for
contact protection box.)

CD-P12

(±)

OUT
Brown

앑

OUT ( )
Blue

±

Dimensions

Lead wire
with connector

Indicator light
D-A80C without

indicator light

Most sensitive position

12-13-9