Relays & Sockets
RY/RM
RY/RM Series Miniature Relays
Key features:
• RY2 (3A), RY4 (5A), RM2 (5A)
• General purpose miniature relays
• 3A or 5A contact capacity
• Wide variety of terminal styles and coil voltages meet a wide range of applications
• All 4PDT types have arc barriers.
Part Number Selection
Part Number
Contact Model Plug-in Terminal PC Board Terminal Coil Voltage Code
DPDT (Slim) 3A
DPDT (Wide) 5A
4PDT 5A
Top mount models are designed to mount directly to a panel and do not require a socket.
Standard
With Indicator
With Check Button
Top Bracket Mounting
With Diode (DC coil only)
Standard
With Indicator
With Check Button
With Indicator and Check Button
Top Bracket Mounting
With Diode (DC coil only)
With Indicator and Diode (DC coil only)
Standard
With Indicator
With Check Button
With Indicator and Check Button
Top Bracket Mounting
With Diode (DC coil only)
With Indicator and Diode (DC coil only)
0 RY2V-U 0
RY2S-U
0 RY2V-UL 0
RY2S-UL
0
RY2S-UC
RY2S-ULC
RY2S-UT
RY2S-UD
RM2S-U
RM2S-UL
RM2S-UC
RM2S-ULC
RM2S-UT
RM2S-UD
RM2S-ULD
RY4S-U
RY4S-UL
RY4S-UC
RY4S-ULC
RY4S-UT
RY4S-UD
RY4S-ULD
0
0
0 RY2V-UD 0
0 RM2V-U 0
0 RM2V-UL 0
0
0
0
0
0
0 RY4V-U 0
0 RY4V-UL 0
0
0
0
0
0
AC6V, AC12V, AC24V, AC110V, AC120V,
AC220V, AC240V
—With Indicator and Check Button
—
—
DC6V, DC12V, D24V, DC48V, DC110V
DC6V, DC12V, DC24V, DC48V, DC110V
RYAC6V, AC12V, AC24V, AC110-120V, AC220-240V
DC6V, DC12V, DC24V, DC48V, DC100-110V
DC6V, DC12V, DC24V, DC48V, DC100-110V
AC6V, AC12V, AC24V, AC110-120V,
AC220-240V
DC6V, DC12V, DC24V, DC48V, DC100-110V
DC6V, DC12V, DC24V, DC48V, DC100-110V
Ordering Information
When ordering, specify the Part No. and coil voltage code:
(example) RY4S-U AC110-120V
Part No. Coil Voltage Code
Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers
800-262-IDEC (4332) • USA & Canada
799
RY/RM
Relays & Sockets
Sockets
Relays
RY2S SY2S-05 SY2S-05C SY2S-51 SY2S-61
RM2 SM2S-05 SM2S-05C SM2S-51
Switches & Pilot LightsSignaling LightsRelays & SocketsTimersContactorsTerminal BlocksCircuit Breakers
RY4S SY4S-05 SY4S-05C SY4S-51
Standard DIN
Rail Mount
Finger-safe DIN
Rail Mount
Through Panel Mount PCB Mount
Hold Down Springs & Clips
Appearance Item Relay
RY2S SY2S-02F1 SY4S-51F1
Pullover Wire
Spring
RM2
RY4S
For DIN
Mount Socket
SY4S-51F1 SY4S-51F1
For Through Panel &
PCB Mount Socket
SY4S-61
SY4S-62
Leaf Spring 1
(side latch)
Leaf Spring 1
(top latch)
1. Not available for PCB mount socket SY4S-62.
2. Order 2 pieces per relay.
RY2S
RM2, RY4S
RY2S
RY4S
SFA-202
SFA-101
2
2
SFA-302
SFA-301RM2
Accessories
Item Appearance Use with Part No. Remarks
Aluminum
DIN Rail
(1 meter length)
DIN Rail End
Stop
Replacement
Hold-Down
Spring Anchor
All DIN rail sockets BNDN1000
DIN rail BNL5 9.1 mm wide.
Horseshoe clip for all DIN rail
sockets
Y778-011
The BNDN1000 is designed to accommodate DIN mount sockets.
Made of durable extruded aluminum, the BNDN1000 measures 0.413
(10.5mm) in height and 1.37 (35mm) in width (DIN standard). Standard
length is 39” (1,000mm).
For use on DIN rail mount socket when using pullover wire hold down
spring. 2 pieces included with each socket.
800
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Relays & Sockets
RY/RM
Specifications
Contact Model
RY2 - DPDT Slim RM2 - DPDT Wide RY4 - 4PDT
Contact Material Gold-plated silver Silver Gold-plated silver
Contact Resistance
Minimum Applicable Load
Operating Time
Release Time
Power Consumption
(approx.)
1
50 mΩ maximum 30 mΩ maximum 50 mΩ maximum
24V DC, 5 mA; 5V DC,
10 mA (reference value)
2
2
AC: 1.1 VA (50 Hz), 1 VA (60 Hz)
DC: 0.8W
Insulation Resistance 100 MΩ minimum (500V DC megger)
1500V AC, 1 minute 2000V AC, 1 minute 2000V AC, 1 minute
Dielectric Strength
1500V AC, 1 minute 2000V AC, 1 minute 2000V AC, 1 minute
1500V AC, 1 minute 2000V AC, 1 minute 2000V AC, 1 minute
1000V AC, 1 minute 1000V AC, 1 minute 1000V AC, 1 minute
Operating Frequency
Vibration Resistance
Shock Resistance
Electrical: 1800 operations/h maximum
Mechanical: 18,000 operations/h maximum
Damage limits: 10 to 55 Hz, amplitude 0.5 mm
Operating extremes: 10 to 55 Hz, amplitude 0.5 mm
Damage limits: 1000 m/s
2
Operating extremes: 100 m/s2 (DPDT Slim), 200 m/s2 (4PDT, DPDT Wide)
Mechanical Life 50,000,000 operations
Electrical Life 200,000 operations (220V AC, 3A) 500,000 operations (220V AC, 5A)
Operating Temperature
3
–25 to +55°C (no freezing) –25 to +45°C (no freezing) –25 to +55°C (no freezing)
Operating Humidity 45 to 85% RH (no condensation)
Weight (approx.) 23g 35g 34g
Note: Above values are initial values.
1. Measured using 5V DC, 1A voltage drop method
2. Measured at the rated voltage (at 20°C), excluding contact bouncing
Release time of relays with diode: 40 ms maximum
Standard Contact
24V DC, 10 mA; 5V DC,
20 mA (reference value)
24V DC, 5 mA; 5V DC,
10 mA (reference value)
20 ms maximum
20 ms maximum
AC: 1.4 VA (50 Hz), 1.2 VA (60 Hz)
DC: 0.9W
AC: 1.4 VA (50 Hz), 1.2 VA (60 Hz)
DC: 0.9W
Between live and dead parts:
Between contact and coil:
Between contacts of different poles:
Between contacts of the same pole:
100,000 operations (220V AC, 5A)
200,000 operations (220V AC, 3A)
3. For use under different temperature conditions, refer to Continuous Load
Current vs. Operating Temperature Curve. The operating temperature range
of relays with indicator or diode is –25 to +40°C.
4. When the total current of 4 contacts is less than 15A, the operating temperature range is –25 to +70°C.
Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers
4
800-262-IDEC (4332) • USA & Canada
801
RY/RM
Relays & Sockets
AC Coil Ratings
Rated Current (mA) ±15% at 20°C
Voltage (V)
Switches & Pilot LightsSignaling LightsRelays & SocketsTimersContactorsTerminal BlocksCircuit Breakers
6 170 240 150 200 18.8 9.4
12 86 121 75 100 76.8 39.3
24 42 60.5 37 50 300 153
110 9.6 — 8.4 — 6,950 —
110-120 — 9.4-10.8 — 8.0-9.2 — 4,290
120 8.6 — 7.5 — 8,100 —
220 4.7 — 4.1 — 25,892 —
220-240 — 4.7-5.4 — 4.0-4.6 — 18,820
240 4.9 — 4.3 — 26,710 —
AC 50Hz AC 60Hz
DPDT
Slim
DPDT Wide &
4PDT
DPDT
Slim
DPDT Wide &
4PDT
Coil Resistance (Ω) ±10%
DPDT
DC Coil Ratings
Rated Current (mA)
Voltage (V)
DPDT Slim DPDT Wide & 4PDT DPDT Slim DPDT Wide & 4PDT
6 128 150 47 40
12 64 75 188 160
24 32 36.9 750 650
48 18 18.5 2,660 2,600
100-110 — 8.2-9.0 — 12,250
110 8 — 13,800 —
±15% at 20°C
Coil Resistance (Ω)
±10% at 20°C
Slim
at 20°C
DPDT Wide &
4PDT
Max. Continuous
Applied Voltage
Operation Characteristics
(against rated values at 20ºC)
Max. Continuous
Applied Voltage
110% 80% maximum
Operation Characteristics
(against rated values at 20ºC)
Pickup
Voltage
110% 80% maximum 10% minimum
Pickup
Voltage
Dropout
Voltage
minimum
Dropout
Voltage
30%
Contact Ratings UL Ratings
Maximum Contact Capacity
Contact
DPDT Slim
(RY2)
DPDT Wide
(RM2)
4PDT (RY4) 5A
Continuous
Current
3A
5A
Note: Inductive load for the rated load — cos ø = 0.3, L/R = 7 ms
Allowable Contact Power Rated Load
Resistive Load Inductive Load Voltage (V) Res. Load Ind. Load
660 VA AC
90W DC
1100VA AC
150W DC
1200 VA AC
150W DC
TÜV Ratings
Voltage
240V AC 3A 5A 5A
30V DC 3A 5A 5A
DPDT
Slim
AC: cos ø = 1.0, DC: L/R = 0 ms
DPDT
Wide
4PDT
176 VA AC
45W DC
440VA AC
75W DC
288 VA AC
60W DC
110V AC 3A 1.5A
220V AC 3A 0.8A
30V DC 3A 1.5A
110V AC 5A 2.5A
220V AC 5A 2A
30V DC 5A 2.5A
240V AC 5A 1.2A
30V DC 5A 2A
Voltage
240V AC 3A 5A 5A 0.8A 2A 5A
120V AC — — — 1.5A 2.5A —
100V DC 0.2A 0.4A 0.2A 0.2A — 0.2A
30V DC 3A 5A 5A 3A — 5A
CSA Ratings
Voltage
240V AC 3A 5A 5A 0.8A 2A 5A
120V AC 3A 5A — 1.5A 2.5A —
100V DC — — — 0.2A 0.4A 0.2A
30V DC 3A 5A 5A 1.5A 2.5A 1.5A
Resistive General use
DPDT
DPDT
Slim
Wide
Resistive General use
DPDT
DPDT
Slim
Wide
4PDT
4PDT
DPDT
Slim
DPDT
Slim
DPDT
Wide
DPDT
Wide
4PDT
4PDT
802
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Relays & Sockets
RY/RM
Socket Specifications
Sockets Terminal Electrical Rating Wire Size Torque
DIN Rail
Mount
Sockets
Finger-safe
DIN Rail
Mount
Through
Panel Mount
Socket
PCB Mount
Socket
SY2S-05 M3 screws with captive wire clamp 300V, 7A Maximum up to 2–#14AWG 5.5-9in•lbs
SM2S-05 M3 screw with captive wire clamp 300V, 10A Maximum up to 2–#14AWG 5.5-9in•lbs
SY4S-05 M3 screw with captive wire clamp 300V, 7A* Maximum up to 2–#14AWG 5.5-9in•lbs
SY2S-05C M3 screws with captive wire clamp, fingersafe 300V, 7A Maximum up to 2–#14AWG 5.5-9in•lbs
SM2S-05C M3 screw with captive wire clamp, fingersafe 300V, 10A Maximum up to 2–#14AWG 5.5-9in•lbs
SY4S-05C M3 screw with captive wire clamp, fingersafe 300V, 7A* Maximum up to 2–#14AWG 5.5-9in•lbs
SY2S-51 Solder 250V, 7A — —
SM2S-51 Solder 250V, 10A — —
SY4S-51 Solder 250V, 7A* — —
SY2S-61 PCB Mount 300V, 7A — —
SY4S-61 PCB Mount 300V, 7A — —
SY4S-62 PCB Mount 250V, 7A — —
* When using only 2 poles of the 4-poles, the UL recognized current is 10A.
Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers
800-262-IDEC (4332) • USA & Canada
803
RY/RM
Electrical Life Curves
AC Load
(RY2)
Switches & Pilot LightsSignaling LightsRelays & SocketsTimersContactorsTerminal BlocksCircuit Breakers
Life (¥ 10,000 operations)
(RM2)
1000
500
200
100
50
20
10
0 1
1000
500
110V AC resistive
220V AC resistive
220V AC inductive
Load Current (A)
110V AC resistive
220V AC resistive
110V AC inductive
2 3
Relays & Sockets
Characteristics (Reference Data)
(RY4)
1000
500
200
100
Life ( ¥ 10,000 operations)
50
20
10
240V AC resistive
240V AC inductive
10 3 52 4
Load Current (A)
100
Life ( ¥ 10,000 operations)
50
10
10 3 52 4
110V AC inductive
220V AC inductive
Load Current (A)
DC Load `
(RY2)
1000
500
200
100
Life (¥ 10,000 operations)
50
20
10
0 5
30V DC resistive
30V DC inductive
100V DC resistive
100V DC inductive
Load Current (A)
2 3
(RM2)
1000
500
30V DC resistive
30V DC inductive
(RY4)
1000
500
200
100
50
Life (¥ 10,000 operations)
20
10
30V DC resistive
30V DC inductive
10 3 52 4
Load Current (A)
804
100
50
Life (¥ 10,000 operations)
10
10 3 52 4
100V DC resistive
100V DC inductive
Load Current (A)
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Relays & Sockets
RY/RM
Maximum Switching Capacity
(RY2)
(RM2)
5
3
1
0.5
Load Current (A)
0.1
1 5
5
1
Load Current (A)
0.5
0.1
1 5
DC inductive
10 100 200 30050
Load Voltage (V)
DC inductive
10
AC
inductive
AC resistive
DC resistive
AC resistive
AC
inductive
100 200 30050
DC
resistive
(RY4)
5
3
2
1
0.5
Load Current (A)
0.3
0.2
1
DC resistive
DC inductive
10
Load Voltage (V)
Load Voltage (V)
Continuous Load Current vs. Operating Temperature Curve (Standard Type, With Check Button, and Top Bracket Mounting Type)
(RM2)
(RY2)
100
90
80
70
60
50
40
30
Operating Temperature (C)
20
10
AC Coil
0
1
Load Current (A)
(RY4)
DC Coil
32
100
90
80
70
60
50
AC Coil
40
30
Operating Temperature (C)
20
10
0
1 32
Load Current (A)
DC Coil
AC resistive
AC inductive
100 200 300503020
100
90
80
70
60
50
40
30
Operating Temperature (C)
20
10
0
1
Load Current (A)
DC Coil
AC Coil
3 52 4
Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers
800-262-IDEC (4332) • USA & Canada
805
RY/RM
Internal Connection (View from Bottom)
Standard Type
DPDT Slim (RY2) DPDT Wide (RM2) 4PDT (RY4) With Check Button
Switches & Pilot LightsSignaling LightsRelays & SocketsTimersContactorsTerminal BlocksCircuit Breakers
With Indicator (-L type)
DPDT Slim (RY2) DPDT Wide (RM2) 4PDT (RY4)
Relays & Sockets
Front
Pushbutton
Contacts can be operated by pressing the
check button.
Coil
Below
100V
AC/DC
Coil
100V
AC/DC
and over
With Diode (-D type)
DPDT Slim (RY2) DPDT Wide (RM2) 4PDT (RY4)
With Indicator and Diode (-LD type)
DPDT Wide (RM2) 4PDT (RY4) DPDT Wide (RM2) 4PDT (RY4)
Coil
Below
24V DC
Coil
Below
24V AC/
DC
Coil 24V
AC/DC
and over
Coil 24V
DC and
over
When the relay is energized,
the indicator goes on.
•An LED protection diode
is not contained in DPDT
relays for coils below 100V
DC.
•If coil polarity is reversed
LED will not light.
Contains a diode to absorb the back emf generated when the coil is de-energized. The release
time is slightly longer.
•Diode Characteristics
Reverse withstand voltage: 1,000V
Forward current: 1A
1
5
9
4
8
12
(+)1413(–)
13(–)
1
2
3
5
6
10
9
4
7
8
11
12
(+)14
Contains an LED
indicator and a surge
absorber.
806
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Relays & Sockets
RY/RM
Dimensions (mm)
RY2S RY4S RM2S
Total length from panel surface including relay socket
SY2S-05: 61.5 (63.5) max., SY2S-51: 39.6 (41.6) max.
3 × ø1.2 oblong hole
Dimensions in the ( )
include a hold-down spring.
2.6
0.5
4
518
9
12
13
14
27.5
35.6 max. 5.4 14
RY2V RY4V RM2V
0.5
35.6 max. 4 14 4.4
2.6
8-ø1 holes
4
518
9
12
0.5 0.8
13
14
27.5
7.15
12.7 4.1
6.4
Total length from the panel surface including relay socket
SY4S-05: 61.5 (63.5) max., SY4S-51: 39.6 (41.6) max.
2.2 × ø1.2
oblong
hole
Dimensions in the ( )
include a hold-down spring.
2.6
12
6135
10
9
0.5
35.6 max. 6.4 21
0.5
0.8
2.6
0.5
35.6 max. 4 21
14-ø1 holes
4
3
1 2
8
7
6135
10
9
7.15
121411
27.5
4.4
4
3
8
7
121411
27.5
6.6
12.7 4.1
6.4
4.4
4.4
35.6 max. 4 21
Total length from the panel surface including relay socket.
SM2S-05: 61.5 (63.5) max., SM2S-51: 39.6 (41.6) max.
Dimensions in the ( )
include a hold-down spring.
2.2 × ø1.2 hole
2.6
1
4
8
5
12
9
0.5
27.5
1413
35.6 max. 6.4 21
0.8
0.5
2.6
1
548
9
12
27.5
13
0.5
14
7.15
8-ø1 hole
13.2
Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers
12.7 4.1
6.4
RY2S-UT RY4S-UT RM2S-UT
2.6
4.4
3 ¥ ø1.2 oblong hole
38
43.2
4.4
0.5 2.6
4
518
9
12
27.5
13
14
38
43.2
2.2 ¥ ø1.2 oblong hole
6.4 6.3 4.1
3.5
14.5
2
35.6 max. 5.4
3.5
21.5
2
35.6 max. 6.4
4.4
4.4
0.5
4.1
6.3
6.4
4873651 2
12141110139
38
43.2
27.5
3.5
21.5
2.2 ¥ ø1.2 hole
2
35.6 max. 6.4
13.2
2.6
4.1
0.5
4
1
8
5
12
9
6.3
27.5
1413
6.4
800-262-IDEC (4332) • USA & Canada
807
RY/RM
623 0.7
31.5
30
623 0.7
1.6 64
17.2
30
64
1.6
Relays & Sockets
Dimensions
Standard DIN Rail Mount Sockets
SY2S-05 SM2S-05
17
6
Switches & Pilot LightsSignaling LightsRelays & SocketsTimersContactorsTerminal BlocksCircuit Breakers
622
16
20
SY4S-05
M3 Terminal
Screw
4.2
31.5
DIN Rail
18
(BNDN)
2-ø4.2 Mounting Holes
(or M4 Tapped Holes)
45
14.5
25
16
4 max.
5.9 max.
Terminal Arrangement
4.8 min.
ø3.2 min.
8
451
14
12
(
Top View
13
9
)
30
6
M3 Terminal
Screw
4.2
26
18
DIN Rail
(BNDN)
2-ø4.2 Mounting Holes
(or M4 Tapped Holes)
45
18.5
25
26
4 max.
5.9 max.
4.8 min.
ø3.2 min.
Terminal Arrangement
8
5
1
4
13914
12
(
)
Top View
6
M3 Terminal
Screw
4.2
26
31.5
DIN Rail
18
(BNDN)
45
18.5
25
2-ø4.2 Mounting Holes
(or M4 Tapped Holes)
26
4 max.
5.9 max.
4.8 min.
ø3.2 min.
Terminal Arrangement
78
432
14
12 1110
(
Top View
56
1
13
9
)
Finger-safe DIN Rail Mount Sockets
SY2S-05C SM2S-05C
35.5
DIN Rail
25
(BNDN)
46
18.2
2
29
2-ø4.2 Mounting Holes
(or M4 Tapped Holes)
16
Ring terminals
cannot be used.
Terminal Arrangement
8
451
13
14
12
9
(
)
Top View
26
16
20
6
M3 Terminal
Screw
ø
5
4.2
SY4S-05C
30
M3 Terminal
6
Screw
ø
5.5
4.2
64
26
1.6
35.5
DIN Rail
25
(BNDN)
18
46
18.2
2
29
2-ø4.2 Mounting Holes
(or M4 Tapped Holes)
26
Ring terminals
cannot be used.
Terminal Arrangement
56
78
432
1
13
14
12 11 10
9
(
)
Top View
6
M3 Terminal
Screw
ø
5.5
4.2
25
18.2
DIN Rail
(BNDN)
2-ø4.2 Mounting Holes
18
(or M4 Tapped Holes)
26
Ring terminals
cannot be used.
Terminal Arrangement
8
5
1
4
13
14
12
9
(
)
Top View
35.5
46
2
29
808
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Relays & Sockets
RY/RM
Through Panel Mount Socket
SY2S-51 SM2S-51
Panel Thickness:
1 to 2
31
0.3
18
12.2
3
11
18.7
2.4
25.4
Terminal Arrangement
1
4
8
5
9
12
13
14
(Bottom View)
[18(N–1)+12.4]
0
+0.2
5.4 min.* 25.6
* 10.4 min. when husing hold-down springs
+0.5
0
N: No. of sockets mounted
31
27
21.2
SY4S-51
Panel Thickness:
1 to 2
31
27
21.2
3
11
18.7
2.4
0.3
25.4
Terminal Arrangement
3
2
1
5
7
846
12
10
11
9
13
14
(Bottom View)
[27 (N–1) + 21.4]
0
+0.2
25.6
5.4 min.*
* 10.4 min. when using hold-down springs
+0.5
0
N: No. of sockets mounted
PCB Mount Sockets
SY2S-61 SY4S-61
13.6 min.
Terminal Arrangement
1
4
5
31
18
3
25.4
0.3
8
12
9
13
14
(Bottom View)
11
15
1.5
* 19.2 min. when using
hold-down springs
12.2
10.4
16.8
14.2 min.*
4.4
4.1
9
31
ø2 holes
8-
(Tolerance 0.1)
21.2
Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers
Panel Thickness:
1 to 2
3
11
18.7
2.4
0.3
Terminal Arrangement
25.4
1
5
9
13 14
(Bottom View)
4
8
12
Terminal Arrangement
3
462
1
5
8
7
12
9
11
25.4
27
3
0.3
11
15
1.5
10
13
14
(Bottom View)
* 19.2 min. when using
hold-down springs
[27 (N–1) + 21.4]
0
+0.2
25.6
5.4 min.*
* 10.4 min. when using hold-down springs
10.4
16.8
14.2 min.*
+0.5
0
N: No. of sockets mounted
13.2
8.8
4.1
1.4
4.4
13.8 min.
ø2 holes
15-
(Tolerance 0.1)
9
SY4S-62
29
21.2
13.2
8.2 min.**
8.8
Terminal Arrangement
3
462
1
5
8
0.3
3
11
15
1.5
7
12
9
11
10
13
(Bottom View)
14
800-262-IDEC (4332) • USA & Canada
4.4
4.1
10.4
16.8
1.4
12.2 min.*
*
17.2 min. when using a hold-down spring.
13.2 min. when using a hold-down spring for
* *
the relay with check button
15-ø2 holes
(Tolerance 0.1)
9
809
Relays & Sockets
Pulsation
)¥
Back emf
Operating Instructions
Operating Instructions
Driving Circuit for Relays
1. To ensure correct relay operation, apply rated voltage to the relay coil.
2. Input voltage for the DC coil:
A complete DC voltage is best for the coil power to make sure of stable relay
operation. When using a power supply containing a ripple voltage, suppress
the ripple factor within 5%. When power is supplied through a rectification
circuit, the relay operating characteristics, such as pickup voltage and dropout
voltage, depend on the ripple factor. Connect a smoothing capacitor for better
operating characteristics as shown below.
Smoothing
Capacitor
+
Relay
R
–
Emin Emax Emean
Ripple Factor (%
Emax = Maximum of pulsating current
Emin = Minimum of pulsating current
Emean = DC mean value
Emax –
Emean
3. Leakage current while relay is off:
When driving an element at the same time as the relay operation, special
consideration is needed for the circuit design. As shown in the incorrect
circuit below, leakage current (Io) flows through the relay coil while the relay
is off. Leakage current causes coil release failure or adversely affects the
vibration resistance and shock resistance. Design a circuit as shown in the
correct example.
Incorrect Correct
R
TE
Io
R
4. Surge suppression for transistor driving circuits:
When the relay coil is turned off, a high-voltage pulse is generated, causing a
transistor to deteriorate and sometimes to break. Be sure to connect a diode
to suppress the back electromotive force. Then, the coil release time becomes
slightly longer. To shorten the coil release time, connect a Zener diode
between the collector and emitter of the transistor. Select a Zener diode with
a Zener voltage slightly higher than the power voltage.
suppressing diode
+
Relay
R
–
Emin
DC
100%
Protection for Relay Contacts
1. The contact ratings show maximum values. Make sure that these values are
not exceeded. When an inrush current flows through the load, the contact
may become welded. If this is the case, connect a contact protection circuit,
such as a current limiting resistor.
2. Contact protection circuit:
When switching an inductive load, arcing causes carbides to form on the
contacts, resulting in increased contact resistance. In consideration of contact
reliability, contact life, and noise suppression, use of a surge absorbing circuit
is recommended. Note that the release time of the load becomes slightly
longer. Check the operation using the actual load. Incorrect use of a contact
protection circuit will adversely affect switching characteristics. Four typical
examples of contact protection circuits are shown in the following table:
This protection circuit can be used when the load
impedance is smaller than the RC impedance in an
Power
CR
RC
+
Power
–
Power
D
Varistor
Diode
Varistor
3. Do not use a contact protection circuit as shown below:
This protection circuit is very effective in arc suppression when
opening the contacts. But, the capacitor is charged while the
contacts are opened. When the contacts are closed, the capacitor
Load
is discharged through the contacts, increasing the possibility of
contact welding.
Power
C
AC load power circuit.
Ind. Load
•R: Resistor of approximately the same resistance
value as the load
•C:0.1 to 1 µF
This protection circuit can be used for both AC and
DC load power circuits.
R: Resistor of approximately the same resistance
value as the load
C: 0.1 to 1 µF
This protection circuit can be used for DC load power
circuits. Use a diode with the following ratings.
Reverse withstand voltage: Power voltage of the
Ind. Load
load circuit x 10
Forward current: More than the load current
This protection circuit can be used for both AC and
DC load power circuits.
For a best result, when using a power voltage of 24
Ind. Load
to 48V AC/DC, connect a varistor across the load.
When using a power voltage of 100 to 240V AC/DC,
connect a varistor across the contacts.
Switches & Pilot Lights Signaling Lights Relays & Sockets Timers Contactors Terminal Blocks Circuit Breakers
Generally, switching a DC inductive load is more difficult than switching a DC
resistive load. Using an appropriate arc suppressor, however, will improve the
switching characteristics of a DC inductive load.
Soldering
1. When soldering the relay terminals, use a soldering iron of 30 to 60W, and
quickly complete soldering (within approximately 3 seconds).
2. Use a non-corrosive rosin flux.
800-262-IDEC (4332) • USA & Canada
Power
C
This protection circuit is very effective in arc suppression when
opening the contacts. But, when the contacts are closed, a current
Load
flows to charge the capacitor, causing contact welding.
817
Operating Instructions
Other Precautions
Relays & Sockets
Operating Instructions con’t
1. General notice:
To maintain the initial characteristics, do not drop or shock the relay.
The relay cover cannot be removed from the base during normal operation. To
Switches & Pilot LightsSignaling LightsRelays & SocketsTimersContactorsTerminal BlocksCircuit Breakers
maintain the initial characteristics, do not remove the relay cover.
Use the relay in environments free from condensation, dust, sulfur dioxide
(SO
), and hydrogen sulfide (H2S).
2
Make sure that the coil voltage does not exceed applicable coil voltage range.
Safety Precautions
• Turn off the power to the relay before starting installation, removal, wiring,
maintenance, and inspection of the relays. Failure to turn power off may
cause electrical shock or fire hazard.
• Observe specifications and rated values, otherwise electrical shock or fire
hazard may be caused.
• Use wires of the proper size to meet voltage and current requirements. Tighten the terminal screws on the relay socket to the proper tightening torque.
• Surge absorbing elements on AC relays with RC or DC relays with diode are
provided to absorb the back electromotive force generated by the coil. When
the relay is subject to an excessive external surge voltage, the surge absorbing element may be damaged. Add another surge absorbing provision to the
relay to prevent damage.
2. UL and CSA ratings may differ from product rated values determined by IDEC.
3. Do not use relays in the vicinity of strong magnetic field, as this may affect
relay operation.
Precautions for the RU Relays
• Before operating the latching lever of the RU relay, turn off the power to
the RU relay. After checking the circuit, return the latching lever to the original position.
• Do not use the latching lever as a switch. The durability of the latching lever
is a minimum of 100 operations.
• When using DC loads on 4PDT relays, apply a positive voltage to terminals of
neighboring poles and a negative voltage to the other terminals of neighboring poles to prevent the possibility of short circuits.
• DC relays with a diode have a polarity in the coil terminals. Apply the DC voltage to the correct terminals.
818
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