Omron ZC-55 DATASHEET

Enclosed Switch

ZC-@55

Small, High-precision Enclosed Switch

• Employs a modified version of Z Basic Switch as built-in switch.

• Same mounting pitch as Z Basic Switch.

• Pre-wired molded terminal models are available.

• Requires less operating force than conventional limit switches.

• Long life expectancy and economical.

• UL, CSA, and EN models are available.

Model Number Structure

■ Model Number Legend

ZC-@55

1

1. Actuator

D: Plunger
Q: Panel mount plunger
Q22: Panel mount roller plunger
Q21: Panel mount crossroller plunger
N22: Sealed roller plunger
N21: Sealed crossroller plunger

Ordering Information

■ List of Models

Actuator Model Actuator Model

Plunger

Panel mount
plunger

Panel mount
roller plunger

Panel mount
crossroller plunger

ZC-D55 ZC-W55

ZC-Q55 ZC-W155

ZC-Q2255 ZC-W255

ZC-Q2155 ZC-W2155

W: Short hinge lever
W1: Hinge lever
W2: Short hinge roller lever
W21: Hinge roller lever
W3: One-way action short hinge roller lever
W31: One-way action hinge roller lever

Short hinge
lever

Hinge lever

Short hinge
roller lever

Hinge roller
lever

Limit

Switches

Sealed roller
plunger

Sealed crossroller
plunger

Note: 1. Use molded terminal models (refer to page 117) when using the Switch under one of the following conditions:

a) dusty, b) high amount of dripping oil, or c) high humidity

2. Micro-load models are available.

e.g. Standard model

ZC-Q55 ZC-Q55-01

ZC-N2255 ZC-W355

ZC-N2155 ZC-W3155

Micro-load model

One-way action
short hinge roller
lever

One-way action
hinge roller lever

Enclosed Switch ZC-@55 F-109

Terminal Protective Cover, Seal Rubber, and Rubber Packing

(The Switch is equipped with these 3 items as a standard.)

• ZC Terminal Cover

Rubber packing

Terminal cover

Seal rubber

(Product code: ZC55-0002H)

• ZC Seal Rubber

(Product code: SC-1404C)

• ZC Rubber Packing

(Product code: ZC55-9999G)

Specifications

■ Approved Standards

(Except Molded Terminal Models and Operation Indicator-equipped Model)

Agency Standard File No.

UL UL508 E76675
CSA C22.2, No. 14 LR45258
TÜV Rheinland EN60947-1, EN60947-5-1 J9650089

■ Approved Standard Ratings

UL/CSA
A300

Voltage Carry current Current Volt-amperes

Make Break Make Break

120 VAC 10 A 60 A 6 A 7,200 VA 720 VA
240 VAC 30 A 3 A

Micro load 0.1 A, 125 VAC

0.1 A, 30 VDC

TÜV Rheinland

250 V, 10 A (AC12)

■ Ratings

Rated voltage Non-inductive load Inductive load

Resistive load Lamp load Inductive load Motor load

NC NO NC NO NC NO NC NO
125 VAC 10 A 3 A 1.5 A 10 A 5 A 2.5 A
250 VAC 10 A 2.5 A 1.25 A 10 A 3 A 1.5 A
8 VDC 10 A 3 A 1.5 A 6 A 5 A 2.5 A
14 VDC 10 A 3 A 1.5 A 6 A 5 A 2.5 A
30 VDC 6 A 3 A 1.5 A 5 A 5 A 2.5 A
125 VDC 0.5 A 0.4 A 0.4 A 0.05 A 0.05 A 0.05 A
250 VDC 0.25 A 0.2 A 0.2 A 0.03 A 0.03 A 0.03 A

Inrush current NC 30 A max.

NO 15 A max.

Note: 1. The above figures are for steady-state currents.

2. Inductive loads have a power factor of 0.4 min. (AC) and a time constant of 7 ms max. (DC).

3. Lamp load has an inrush current of 10 times the steady-state current.

4. Motor load has an inrush current of 6 times the steady-state current.

5. The above ratings were tested under the following conditions according to JIS C4508.

Ambient temperature: 20±2°C
Ambient humidity: 65±5%
Operating frequency: 20 operations/min

F-110 Enclosed Switch ZC-@55

■ Characteristics

Degree of protections IP67
Durability Mechanical: 10,000,000 operations min.

Operating speed 0.05 mm to 0.5 m/s (at pin plunger)
Operating frequency Mechanical: 120 operations/min

Insulation resistance 100 MΩ min. (at 500 VDC)
Contact resistance 15 mΩ max. (initial value)
Dielectric strength 1,000 VAC, 50/60 Hz for 1 min between non-continuous terminals

Rated insulation voltage (U
Pollution degree

(operating environment)
Short-circuit protective device 10 A-fuse type gG (IEC 269)
Protection against electric

shock
PT1 (tracking characteristics) 175
Switch category D (IEC335)
Rated operating current (Ie) 10 A
Rated operating voltage (Ue) 250 VAC
Vibration resistance Malfunction: 10 to 55 Hz, 1.5-mm double amplitude (see note)
Shock resistance

Ambient temperature Operating: –10°C to 80°C (with no icing)
Ambient humidity Operating: 35% to 95%
Weight Approx. 92 g (in case of ZC-Q22(21)55)

Note: Less than 1 ms under a free state at the operating limits.

Electrical: 500,000 operations min.

Electrical: 20 operations/min

2,000 VAC, 50/60 Hz for 1 min between current-carrying metal part and ground, and between each terminal
and non-current-carrying metal parts

) 1,000 VAC

i

3 (IEC947-5-1)

Class II

2

Destruction: 1,000 m/s
Malfunction: 300 m/s

max.

2

max. (at pin plunger) (see note)

Limit

Switches

■ Operating Characteristics

Model ZC-D55 ZC-Q55 ZC-Q2255 ZC-Q2155 ZC-N2255 ZC-N2155
OF max. 11.8 N 11.8 N 6.86 N
RF min. 4.90 N 4.90 N 1.67 N
PT max. 1.5 mm 1.5 mm 1.5 mm
OT min. 2.4 mm 3 mm 2.5 mm
MD max. 0.2 mm 0.2 mm 0.2 mm
OP 32.4±0.8 mm 38.2±0.8 mm 47.4±0.8 mm

Model ZC-W55 ZC-W155 ZC-W255 ZC-W2155 ZC-W355 ZC-W3155
OF max. 3.92 N 2.75 N 3.92 N 2.75 N 3.92 N 2.75 N
RF min. 0.78 N 0.59 N 0.78 N 0.59 N 0.78 N 0.59 N
OT min. 6 mm 8.4 mm 6 mm 8.4 mm 6 mm 8.4 mm
MD max. 1 mm 1.4 mm 1 mm 1.4 mm 1 mm 1.4 mm
OP 28.5±1.2 mm 28.5±1.2 mm 43±1.2 mm 43±1.2 mm 53±1.2 mm 53±1.2 mm
FP max. 34.7 mm 36.7 mm 49.2 mm 51.3 mm 59.2 mm 61.2 mm

■ Contact Form

NC

COM NO NC

COM

EN60947-5-1

NO

Enclosed Switch ZC-@55 F-111

Engineering Data

)

■ Mechanical Durability

■ Electrical Durability

(for ZC-Q55)

Operating temperature: 20±2°C
Operating humidity: 65±5%
No load
Operating frequency: 120 operations/min

operations)

operations)

4

Durability (x 10

OT (mm)

4

Durability (x 10

Operating temperature: 20±2°C
Operating humidity: 65±5%
Operating frequency: 20 operations/min

Switching current (A

Nomenclature

Changing the Terminal Protective Cover around allows the cable to be pulled out from either the right or the left.

Roller

Plunger

Case

NC fixed contact

Switch

Packing

Terminal
Protective
Cover

Common
terminal
(COM)

Normally
open
terminal
(NO)

Normally
closed
terminal
(NC)

Moving contact

NO fixed contact

Seal rubber

Note: M4 binding head screws (with toothed washers) are used as the terminal screws.

F-112 Enclosed Switch ZC-@55

Dimensions

Note: 1. All units are in millimeters unless otherwise indicated.

2. Unless otherwise specified, a tolerance of ±0.4 mm applies to all dimensions.

Plunger
ZC-D55

7.8 dia.
(see note)

22 max.

15

Terminal
Protective
Cover

Two, 4.3±0.1 dia.
mounting holes

14 dia

(21 × 21)

Note: Stainless steel plunger

Seal rubber (NBR)

Panel Mount Plunger
ZC-Q55

22 max.

(See
note 2)

Terminal
Protective
Cover

7.8 dia.
(see note 1)

M14 × 1 mounting screw

Two hexagon nuts
(thickness: 3
width: 17)

(15)

Two, 4.3±0.1 dia.
mounting holes

(21 × 21)

Note: 1. Stainless steel plunger

Seal rubber (NBR)

2. The length of the imperfect threads
is 1.5 mm maximum.

3. Do not use the M14 mounting
screw and the case mounting hole
at the same time.

Limit

Switches

Enclosed Switch ZC-@55 F-113

Panel Mount Roller Plunger
ZC-Q2255

(See
note 2)

11 dia. × 4.7
(see note 1)

Set position

indication line
Two hexagon nuts
(thickness: 3
width: 17)

M14 × 1 mounting
screw

22 max.

Terminal
Protective
Cover

Panel Mount Crossroller Plunger

22 max.

Set position
indication
line

Terminal
Protective
Cover

ZC-Q2155

Sealed Roller Plunger
ZC-N2255

22 max.

Terminal
Protective
Cover

Sealed Crossroller Plunger
ZC-N2155

15

Two, 4.3±0.1 dia.
mounting holes

M14 × 1 mounting
screw

Two hexagon nuts
(thickness: 3
width: 17)

15

Two, 4.3±0.1 dia.
mounting holes

9.5 dia. × 4.7
(see note)

Rubber boot
(chloroprene
rubber)

15

Two, 4.3±0.1 dia.
mounting holes

Rubber boot
(chloroprene
rubber)

(21

× 21)

11 dia. × 4.7
(see note 1)

× 21)

(21

× 21)

(21

Seal rubber (NBR)

Seal rubber (NBR)

Seal rubber (NBR)

9.5 dia. × 4.7
(see note)

Note: 1. Stainless sintered alloy roller

2. The length of the imperfect

threads is 1.5 mm maximum.

3. Do not use the M14 mounting
screw and the case mounting
hole at the same time.

Note: 1. Stainless sintered alloy roller

2. The length of the imperfect
threads is 1.5 mm maximum.

3. Do not use the M14 mounting
screw and the case mounting
hole at the same time.

Note: Stainless sintered alloy roller

22 max.

Terminal
Protective

22 max.

Cover

t = 1
(see note)

5

Terminal
Protective
Cover

Short Hinge Roller Lever
ZC-W55

F-114 Enclosed Switch ZC-@55

34.6

50R

15

Two, 4.3±0.1 dia.
mounting holes

15

Two, 4.3±0.1 dia.
mounting holes

(21

(21

× 21)

× 21)

Note: Stainless sintered alloy roller

Seal rubber (NBR)

Note: Stainless steel lever

Seal rubber (NBR)

Hinge Lever
ZC-W155

Short Hinge Roller Lever
ZC-W255

22 max.

t = 1
(see note)

Terminal
Protective
Cover

t = 1
(see note1)

34.6

34.6

50R

70R

15

Two, 4.3±0.1 dia.
mounting holes

(21 × 21)

12.7 dia. × 7.5
(see note 2)

Note: Stainless steel lever

Seal rubber (NBR)

22 max.

Terminal
Protective

22 max.

Cover

t = 1
(see note1)

Terminal
Protective
Cover

Hinge Roller Lever
ZC-W2155

One-way Action Short Hinge Roller Lever
ZC-W355

t = 1
(see note1)

22 max.

Terminal
Protective
Cover

One-way Action Hinge Roller Lever
ZC-W3155

34.6

34.6

Angle of
roller
swing:
90

°

54R

34.6

70R

Operating
direction

15

Two, 4.3±0.1 dia.
mounting holes

15

Two, 4.3±0.1 dia.
mounting holes

15

Two, 4.3±0.1
dia. holes

Operating
direction

(21 × 21)

(21 × 21)

12.7 dia. × 7.5
(see note 2)

(21 × 21)

12.7 dia. × 7.5
(see note 2)

Seal rubber (NBR)

12.7 dia. × 7.5
(see note 2)

Seal rubber (NBR)

Seal rubber (NBR)

Note: 1. Stainless steel lever

2. Stainless steel roller

Note: 1. Stainless steel lever

2. Stainless steel roller

Note: 1. Stainless steel lever

2. Stainless steel roller

Limit

Switches

22 max.

t = 1
(see note1)

Terminal
Protective
Cover

73R

Angle of
roller
swing:
90°

15

Two, 4.3±0.1 dia.
mounting holes

(21 × 21)

Note: 1. Stainless steel lever

2. Stainless steel roller

Seal rubber (NBR)

Enclosed Switch ZC-@55 F-115

■ Operation Indicator-equipped Models

All the models can be equipped upon request with a operation indicator to facilitate maintenance and inspection.
Because the indicator is incorporated in the Terminal Protective Cover, the dimensions of the Limit Switch are not affected. In this model, the lead

wire is to be connected to the screw terminal. (A connecting washer is provided on the tip of the lead wire).
The lead wire can be connected to either the NC or NO terminal.
Operating characteristics are the same as the standard model from which the operation indicator equipped model is fabricated.

AC Operation

The operating voltage range is from 90 to 250 VAC.
The dimensions are the same as the standard type. The top of the

Terminal Protective Cover is transparent to allow checking the opera­tion easily.

When placing your order for the indicator equipped, AC-operated
model, add suffix “L” to the end of the model number.

Example:

Standard type: ZC-Q2255
Indicator equipped type: ZC-Q2255-L

Neon lamp position

DC Operation

The DC-operated is provided with an LED indicator.
Since a rectifier stack is incorporated into the unit to permit reversing

the polarity, this type can also operate on AC power source. An exter­nal 24VDC power supply can be used, eg. OMRON S8VS or S82K.

The LED projects from the housing for easy visibility.
When placing your order, add suffix “L2” to “L5” to the model number

of the standard type.

Example:

Standard type: ZC-Q2255
Indicator equipped type: ZC-Q2255-L2

Terminal Protective Cover (transparent)

Contact Circuit

NC terminal

NO terminal

Note: If the wiring is as shown above, the operation of the respective

parts will be as follows:

Contact Neon lamp Load Actuator

NC ON Does not operate Operates

OFF Operates Does not

NO ON Does not operate Does not

OFF Operates Operates

Power source

Neon lamp

Built-in switch

Power source

Built-in switch

Neon lamp

R = 240 k

Load

Load

R = 240 kΩ

Ω

operate

operate

LED

Type Voltage rating Leakage current Internal

resistance

L2 12 V Approx. 2.4 mA 4.3 kΩ
L4 24 V Approx. 1.2 mA 18 kΩ

Contact Circuit

NC terminal

NO terminal

Note: If the wiring is as shown above, the operation of the respective

parts will be as follows:

Contact LED Load Actuator

NC ON Does not operate Operates

OFF Operates Does not operate

NO ON Does not operate Does not operate

OFF Operates Operates

Power source

LED

Resistance

Load

Built-in switch

Power source

Built-in switch

Load

Resistance

LED

F-116 Enclosed Switch ZC-@55

Molded Terminal Models

■ Molded Terminal Model

The molded-terminal model is available with right-hand, left-hand
and underside leads and is recommended for use where the Switch
is exposed to dust, oil or moisture.

The molded-terminal model is not approved by UL and CSA.

ML

MD

Suffix by Location of Lead Outlet

Location of lead output Model

COM, NC and NO

Right-hand ZC-@-MR
Left-hand ZC-@-ML
Underside ZC-@-MD

Lead Supplies

MR

Note: When placing your order for the Switch, specify the required

length of V.C.T. cable in addition to the model number of the
Switch.

Example:

Standard type: ZC-Q2155
Location of lead output: Underside
Length of lead: 1 m (V.C.T. lead)
When placing your order for the above Switch, specify the model
number as ZC-Q2155-MD VCT 1 m.

Limit

Switches

Leads Nominal

V.C.T. (vinyl cabtire cable)

cross-sectional area

1.25 mm

2

Finished outside

diameter

3 core: 10.5 dia. Black: COM

Terminal connections Standard length

White: NO
Red: NC

1, 3, 5 m

Enclosed Switch ZC-@55 F-117

Precautions

■ Correct Use

Dog Angle

When operating the roller type, be sure to set the dog angle to less
than 30° (even when operating at a low speed). Operating the model
at a dog angle exceeding 30° will soon cause abrasion or damage.
Do not apply a twisting force to the plunger. Set the OT to 70% to
100% of the specified value so that the actuator will not exceed the
OT.

Handling

When detaching the Terminal Protective Cover, insert a screwdriver
and apply a force in the opening direction. Do not use excess force to
remove the cover. Doing so may cause deformation in the fitting sec­tion and reduce the holding force.

Screwdriver

Terminal Protective Cover

When mounting the Terminal Protective Cover to the case, align the
cover on the case and then press the cover down to mount it firmly. If
the cover is pressed down in an inclined position, rubber packing will
deform and thus affect the sealing capability.

Rubber packing

• A 8.5- to 10.5-dia. cable can be applied as seal rubber for the lead

wire outlet. (Use two- or three-core cable of VCT1.25 mm

• Use weather-proof rubber (chloroprene rubber) as seal rubber for

the ZC-N22(21)55.

Mounting

• When mounting the Switch with screws on a side surface, fasten

the Switch with M4 screws and use washers, spring washers, etc.,
to ensure secure mounting.

Mounting Holes

Two, 4.3-dia. or M4 screw holes

• When mounting the Panel Mount-type Enclosed Switch (ZC-Q55,

ZC-Q2255, or ZC-Q2155) with screws on a side surface, remove
the hexagonal nuts from the actuator.

Rubber packing

2

.)

Mounting Hole Dimensions

+0.2

14.5

dia.

0

Tightening Torque

A loose screw may result in a malfunction. Be sure to tighten each
screw to the proper tightening torque as shown below.

No. Type Torque

1 Terminal screw 0.78 to 1.18 N·m
2 Panel mounting screw 4.90 to 7.84 N·m
3 Side mounting screw 1.18 to 1.47 N·m

Operation

With the ZC-Q22(21)55, an appropriate OT line is marked on the
plunger. Set the OT so that it is between the two X-surface lines.

Appropriate OT line

X-surface

Micro-load Applicable Ranges

Using a standard load switch for opening and closing a micro-load
circuit may cause wear on the contacts. Use the switch within the
operating range. (Refer to the diagram below.) Even when using
micro-load models within the operating range shown below, if inrush
current occurs when the contact is opened or closed, it may cause
the contact surface to become rough, and so decrease life expect­ancy. Therefore, insert a contact protection circuit where necessary.
The minimum applicable load is the N-level reference value. This
value indicates the malfunction reference level for the reliability level
of 60% (λ

the estimated malfunction rate is less than 1/2,000,000 operations
with a reliability level of 60%.

Voltage (VDC)

Model ZC-@55-01 ZC-@55
Minimum

applicable load

). The equation λ60 = 0.5 × 10−6/operations indicates that

60

0.8 W

100 mA

30

24

12

Unusable
area

5

0

Operating area for
ZC-@55-01 micro­load models

1 mA

1 10 100 1,0000.1

26 mA

100 mA 160 mA

Current (mA)

Operating
area for
ZC-@55
standard
models

1 mA at 5 VDC 160 mA at 5 VDC

ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.

Cat. No. C025-E1-09

In the interest of product improvement, specifications are subject to change without notice.

F-118 Enclosed Switch ZC-@55