Universal Relays

RU Series

SafetyThe contact position can be confirmed through the five small
windows.
Using the latching lever, operation can be checked without
energizing the coil. The latching lever is color coded for AC andDC coils.(AC coil: Orange DC coil: Green)
Non-polarized LED indicator available on plug-in relays.
Latching Lever

Mechanical IndicatorMarking Plate

20.4

5.1

19.0

3.7

Dimensions

LED Indicator

Reliable

Full featured universal miniature relays.
Designed with environment taken into
consideration.

No internal wires. Simple construction.

Easy-to-Use
Marking plate for easy identification of relays(Optional marking plates available in four other colors)
Applicable for small loads to maximum contact currents.
(See table below)
Max. continuous current
Min. applicable load(Note)
Note: Reference value.

• See website for details on approvals and standards.
• Lloyd Register type approved.

H-015

RU2
10A
24V DC
5mA

RU4
6A
1V DC
1mA

Green

Blue

With latching lever
DC coilWithout latching lever
DC coilOrangeRed

With latching lever
AC coilWithout latching lever
AC coil

RU42
3A
1V DC
0.1mA

Relays & Sockets

RU Series Universal Relays
Single Contact

shape

APEM

Plug-in Terminal With Latching Lever
Standard (DPDT)

Termination

Latching Lever

With Latching
Lever
Plug-in Terminal(*1)
Without Latching
Lever

PCB Terminal

Without Latching
Lever

PCB Terminal Without Latching Lever
Standard (4PDT)

Part No.

Style

DPDT

Coil Voltage Code ∗4PDT
RU4S-∗

A24, A100, A110, A200, A220
D6, D12, D24, D48, D100, D110

With RC (AC coil only)

RU2S-R-∗

RU4S-R-∗

A100, A110, A200, A220

With diode (DC coil only)

RU2S-D-∗

RU4S-D-∗

D6, D12, D24, D48, D110

Explosion Proof

With diode (DC coil only)
Reverse polarity coil

RU2S-D1-∗

RU4S-D1∗

D24

Terminal Blocks

Standard

RU2S-C-∗RU4S-C-∗

A24, A100, A110, A200, A220
D6, D12, D24, D48, D100, D110

Relays & Sockets

With RC (AC coil only)

RU2S-CR-∗

RU4S-CR-∗

A100, A110, A200, A220

With diode (DC coil only)

RU2S-CD-∗

RU4S-CD-∗

D6, D12, D24, D48, D110

Power Supplies

With diode (DC coil only)
Reverse polarity coil

RU2S-CD1-∗

RU4S-CD1-∗

D24

LED Illumination

Simple (*2)

RU2V-NF-∗

RU4V-NF-∗

A24, A100, A110, A200, A220
D6, D12, D24, D48, D100, D110

Controllers

Specify a coil voltage code in place of ∗in the Part No.
Coil Voltage Code ∗shapePlug-in Terminal With Latching Lever
Standard

Latching Lever

Style

Without Latching
Lever

PCB Terminal

Without Latching
Lever

Part No.
4PDT
RU42S-∗

Standard

Plug-in Terminal(*1)

Emergency
Stop Switches
Enabling
Switches

RU2S-∗Part No. Development

With Latching
Lever

Control Boxes

Standard

Bifurcated Contact

Termination

Switches &Pilot Lights

Coil Voltage Code ∗A24, A100, A110, A200, A220
D6, D12, D24, D48, D100, D110

With RC (AC coil only)

RU42S-R-∗

A100, A110, A200, A220

With diode (DC coil only)

RU42S-D-∗

D6, D12, D24, D48, D100, D110

With diode (DC coil only)
Reverse polarity coil

RU42S-D1-∗

D24Standard

RU42S-C-∗

A24, A100, A110, A200, A220
D6, D12, D24, D48, D100, D110

With RC (AC coil only)

RU42S-CR-∗

A100, A110, A200, A220

With diode (DC coil only)

RU42S-CD-∗

D6, D12, D24, D48, D100, D110

With diode (DC coil only)
Reverse polarity coil

RU42S-CD1-∗

D24

Simple (*2)

RU42V-NF-∗

A24, A100, A110, A200, A220
D6, D12, D24, D48, D100, D110

24V AC
100-110V AC
110-120V AC
200-220V AC
220-240V AC
24V DC
6V DC
12V DC48V DC
100V DC
110V DC

Safety Products

Circuit
Protectors

Operator
Interfaces
Sensors
AUTO-ID

Coil Rating
White
Clear
Blue
Black
Red
Green

Voltage marking
on yellow tape

RelaysSockets
DIN Rail
Products

RJ
RU
RV8H
RL

*1) Plug-in terminal, except for simple types, have an LED indicator and a mechanical indicator as standard.
*2) Simple types do not have an LED indicator, a mechanical indicator, and a latching lever.

Accessory
Name
Marking Plate

Part No.
RU9Z-P∗

Ordering No.
RU9Z-P∗PN10

Color Code ∗A (orange), G (green), S (blue), W (white), Y (yellow)

Package Quantity10

Note: Specify a color code in place of the Part No. When ordering, specify the Ordering No.
The marking plate can be removed from the relay by inserting a flat screwdriver under the marking plate.

H-016

RU Series Universal Relays
Relays & Sockets

Coil RatingsAC(50/60 Hz)
APEM
Switches &Pilot Lights
Control Boxes
Emergency
Stop Switches
Enabling
SwitchesDC

Rated Current (mA) ±15%
(at 20°C)
50 Hz
60 Hz
49.3
42.5
9.2-11.0
7.8-9.0
8.4-10.0
7.1-8.2
4.6-5.5
4.0-4.6
4.2-5.0
3.6-4.2
155
80
44.7
18
9.7
8.9

Coil
Voltage Code

Rated Voltage (V)24100-110110-120200-220220-240
  6
12
24
48
100
110

A24
A100
A110
A200
A220
D6
D12
D24
D48
D100
D110

Safety Products• The rated current includes the current draw by the LED indicator.

Explosion ProofContact Ratings

Terminal Blocks
Relays & Sockets

Contact

Circuit
Protectors

10A

AUTO-ID

4PDT
(RU4)

6A

Relays4PDT(RU42)
bifurcated

3A

Operator
Interfaces
Sensors

Sockets
DIN Rail
Products

Inductive
Load

Voltage
(V)

Res.
Load

Ind.
Load

Electrical Life
(operations)

10A
5A
100,000 min.
5A—
500,000 min.
250 AC—
2.5A 300,000 min.
2500VA AC 1250VA AC
10A
5A
100,000 min.
300W DC 150W DC
30 DC
5A
—
500,000 min.
—
2.5A 300,000 min.
110 DC 0.6A 0.4A 100,000 min.
6A
2.6A
50,000 min.
250 AC
3A
0.8A 200,000 min.
6A
2.7A
50,000 min.
1500VA AC 600VA AC
30 DC
180W DC 90W DC
3A
1.5A 200,000 min.
0.65A 0.33A 50,000 min.
110 DC
0.33A 0.18A 200,000 min.
250 AC
3A
0.8A 100,000 min.
750VA AC 200VA AC
30 DC
3A
1.5A 100,000 min.
90W DC
45W DC110 DC 0.44A 0.22A 100,000 min.

Controllers

Operating Characteristics (against rated values at 20°C)
Maximum Continuous
Minimum Pickup
Dropout Voltage
Applied Voltage
Voltage

110%

80% maximum

30% minimum

110%

80% maximum

10% minimumSpecifications

Continu­ous
Current
Resistive
Load

DPDT
(RU2)

164
3,460
4,550
14,08018,230
40
160
605
2,560
10,00012,100

Rated Load

Allowable
Contact PowerPower Supplies
LED Illumination

Coil Resistance (Ω) ±10%
(at 20°C)• On 4PDT relays, the maximum allowable total current of neighboring two poles is 6A. At
the rated load, make sure that the total current of neighboring two poles does not exceed
6A (3A + 3A = 6A).

Model
Contact Material

RU2 (DPDT)Silver alloy

RU4 (4PDT)
Silver(gold clad)

RU42 (4PDT)
Silver-nickel(gold clad)Contact
50 mΩ maximum
Resistance(*1)
24V DC, 5 mA
1V DC, 1 mA
1V DC, 0.1 mA
Minimum
Applicable Load (*2) (reference value)
Operate Time (*3) 20 ms maximum
Release Time (*3) 20 ms maximum
AC: 1.1 to 1.4VA (50 Hz), 0.9 to 1.2VA (60 Hz)
Power Consumption
DC: 0.9 to 1.0W
Insulation Resistance 100 MΩ minimum (500V DC megger)
Between contact and coil: 2500V AC, 1 minuteBetween contacts of different poles:
Dielectric Strength
2500V AC,
2000V AC, 1 minute
1 minute
Between contacts of the same pole: 1000V AC, 1 minuteElectrical: 1800 operations/h maximum
Operating Frequency
Mechanical: 18,000 operations/h maximum
Vibration Resistance

Damage limits:
10 to 55 Hz, amplitude 0.5 mm
Operating extremes: 10 to 55 Hz, amplitude 0.5 mm

Shock Resistance

Damage limits:
1000 m/s2
Operating extremes: 150 m/s2

AC: 50,000,000 operations
50,000,000
DC: 100,000,000 operations
operations
Electrical LifeSee H-019 and H-021.
Operating
PCB terminal: –55 to +70°C (no freezing)
Temperature(*4) Others:–55 to +60°C (no freezing)
Operating Humidity 5 to 85% RH (no condensation)
Storage Temperature –55 to +70°C RH (no freezing)
Storage Humidity
5 to 85% RH (no condensation)
Weight (Approx.)
35g
Mechanical Life

RJ
RU
RV8H

UL and c-UL Ratings
Voltage
250V AC
30V DC

RU2
10A
10A

Resistive
RU4 RU42
—
—
6A
3A

RU2
—
—

General Use
RU4 RU42
6A
3A——

Horse Power Rating
RU2
RU4 RU42— 1/10HP —
—
—
—

RL

CSA Ratings
Voltage
250V AC
30V DC

Resistive
RU2
RU4 RU42
10A
—
—
10A
6A
3A

RU2
—
—

RU4
6A
—

RU42
3A
—

TÜV Ratings
Voltage
250V AC
30V DC

RU2
10A
10A

Resistive
RU4 RU42
6A
3A
6A
3A

RU2
5A
5A

Inductive
RU4 RU42
0.8A 0.8A
1.5A 1.5A

Surge Suppressor Ratings
Type

H-017

AC CoilWith RCDC CoilWith Diode

Ratings
RC series circuit
R: 20 kΩ, C: 0.033 µF
Diode reverse voltage: 1000V
Diode forward current: 1A

RU2
—
—

RU4 RU42
1/10HP ———Note: Above values are initial values.
*1) Measured using 5V DC, 1A voltage drop method*2) Measured at operating frequency of 120 operations/min(failure rate level P, reference value)*3) Measured at the rated voltage (at 20°C), excluding contact bouncing;Release time of AC relays with RC: 25 ms maximum
Release time of DC relays with diode: 40 ms maximum*4) Measured at the rated voltage.

RU Series Universal Relays
Relays & Sockets

RU2 (DPDT Contact)
Dimensions
Plug-in Terminal

PCB Terminal

APEM
Switches &Pilot Lights
Control Boxes

Photo: RU2V-NF-A100

Photo: RU2S-A100

RU2S

RU2S-C/RU2S-NF
Mechanical Indicator Window

Safety Products
Marking Plate (yellow)

Explosion Proof

Marking Plate (yellow)
Color Marking
AC: Yellow
DC: Blue

LED Indicator(green)Latching
Lever
AC: Orange
DC: Green

RU2V

Mechanical Indicator Window (RU2S-C only)

Marking Plate (yellow)

Emergency
Stop Switches
Enabling
Switches

LED Indicator(green)(RU2S-C only)

Color Marking
AC: Yellow
DC: Blue

Terminal Blocks
Relays & Sockets
Circuit
Protectors
Power Supplies
35.0

Marking Plate
Removal Slot

LED Illumination

4.0

6.4
14

5

12

4

8

1

Controllers

13.2

Operator
Interfaces

0.8
2.6

Sensors

ø1.2 × 2.2 HoleAUTO-ID
21.0

21.0

0.5

2.6

21.0

9

14

2.6

13

6.4

12

ø1.2 × 2.2 Hole

9

5

0.5

0.5

13

4

8

1

0.5

35.0

Marking Plate
Removal Slot

35.0

Marking Plate
Removal Slot

27.5

27.5

27.5

RelaysMounting Hole Layout
7.0

1

8-ø

13.2

Marking plate removal slot is provided only on one side.
Insert a flat screwdriver into the slot to remove the marking plate.

es
Hol

4.1

Sockets
DIN Rail
Products

6.4
12.7
RJ

All dimensions in mm.

Internal Connection (Bottom View)
RU2S-* Standard

RV8H

RU2S-*D With DiodeRU2S-*D1 With Diode
Reverse Polarity CoilRU2S-*R With RC(1) 12(4) 42

(1)12

(4)42

(1) 12(4) 42(1) 12(4) 42(5)14(8) 44(5)14(8) 44(5) 14(8) 44(5)14(8) 44(9) 11(12) 41(9) 11(12) 41(9) 11(12) 41(9)11(12) 41(13) A1(14) A2(13) A1(14) A2(13) A1(14) A2(13) A1(14) A2(1) 12(4) 42(1)12(4) 42(5)14(8) 44(5)14(8) 44(9) 11(12) 41(9)11(12) 41(13) A1(14) A2(13) A1(14) A2

24V DC or lessRL

24V DCOver 24V DC

Over 24V DC

RU

RU2S-NF-*/RU2V-NF-*(1) 12(4) 42(5) 14(8) 44(9) 11(12) 41(13) A1(14) A2

24V DC or less

Blank or C comes in place of ∗ to represent types with or without a latching lever.

H-018

RU Series Universal Relays
Relays & Sockets

Electrical Life Curves
RU2 (Resistive Load)

RU2 (Inductive Load)

250V AC
30V DC
110V DC

250V AC/30V DC
110V DC
1000

Control Boxes
Emergency
Stop Switches
Enabling
Switches(× 10,000 operations)

APEM
Switches &Pilot Lights(× 10,000 operations)

1000

100

10

100

10
AC: cos ø = 0.3
DC: L/R = 7 ms

1

Safety Products

0.1

0.5

1

5

1

10

0.1

0.5

1

5

10

Load Current (A)Load Current (A)Explosion Proof
Terminal Blocks
Relays & Sockets
Circuit
Protectors

Maximum Switching Current
RU2

Power Supplies

AC resistive
AC inductive (cos ø = 0.3)

10

LED Illumination

5

Operator
Interfaces
Sensors

Load Current (A)Controllers

AUTO-ID

DC resistive
1

DC inductive
L/R = 7 ms

0.1

Relays1030

100 250 500

Load Voltage (V)Sockets
DIN Rail
Products

Ambient Temperature vs. Temperature Rise Curves
RU2 (AC Coil, 50 Hz)

RL

Temperature Rise (°C)

RV8H

RU2 (DC Coil)

120

120

120

110

110

110

100

100

100

90

90

90

80

Load current
10A × 2 poles

70
60
50
40
30

Load current
5A × 2 poles

20

70

Load current
10A × 2 poles

60
50
40
20

10
0

80

30

No load current

Load current
5A × 2 poles

20

30

40

50

Ambient Temperature (°C)

60

70

0

10

20

80
70

30

40

Load current
10A × 2 poles

60
50
40
30

Load current
5A × 2 poles

20

No load current

1010Temperature Rise (°C)

RU

RU2 (AC Coil, 60 Hz)

Temperature Rise (°C)

RJ

No load current

10
50

Ambient Temperature (°C)

60

70

0

10

20

30

40

The above temperature rise curves show the characteristics when 100% the rated coil voltage is applied.
The heat resistance of the coil is 120°C. The slant dashed line indicates the allowable temperature rise for the coil at different ambient
temperatures.

H-019

50

Ambient Temperature (°C)

6070

RU Series Universal Relays
Relays & Sockets

RU4 (4PDT Contact)
Dimensions
Plug-in Terminal

PCB Terminal

APEM
Switches &Pilot Lights
Control Boxes

Photo: RU42S-A100

RU4S/RU42S

RU4S-C/RU4S-NF
RU42S-C/RU42S-NF

RU4V/RU42V

Safety Products
Explosion Proof

Mechanical Indicator Window (RU4S-C/RU42S-C only)

Mechanical Indicator Window

Marking Plate (yellow)
Terminal Blocks

Marking Plate (yellow)

Marking Plate (yellow)
Color Marking
AC: Yellow
DC: Blue

LED Indicator(green)Latching
Lever
AC: Orange
DC: Green

Emergency
Stop Switches
Enabling
Switches

Photo: RU4V-NF-D24

LED Indicator(green)(RU4S-C/
RU42S-C only)

Color Marking
AC: Yellow
DC: Blue

Relays & Sockets
Circuit
Protectors
Power Supplies
LED Illumination
35.0

Marking Plate
Removal Slot

Controllers

27.5

3-4.4

4.0

6.4

2.6

0.8
2.6

14

ø1.2 × 2.2 Hole

27.5

7.0

Sockets
ø1

14-

RU4S-∗D1/RU42S-∗D1
With Diode Reverse Polarity CoilRU4S-∗R/RU42S-∗R
With RC

(1)12

(2)22

(3)32

(4)42

(1)12

(2)22

(3)32

(4)42

(1)12

(2)22

(3)32

(4)42

(1)12

(2)22

(3)32

(4)42

(5)14

(6)24

(7)34

(8)44

(5)14

(6)24

(7)34

(8)44

(8)44

(5)14

(6)24

(7)34

(8)44

(14)A2

(5)14

(6)24

(7)34

(9)11 (10)21 (11)31 (12)41(9)11(10)21(11)31 (12)41(14)A2(13)A1(13)A1

Over 24V DC

Over 24V AC/DC
(2)22

(3)32

(4)42

(1)12

(2)22

(3)32

(4)42

(5)14

(6)24

(7)34

(8)44

(5)14

(6)24

(7)34

(8)44

(13)A1(14)A2

24V AC/DC or less(14)A2(9)11 (10)21 (11)31 (12)41(13)A1

RJ

RV8H
RL

(9)11 (10)21 (11)31 (12)41(14)A2(13)A1

24V DC(1)12(9)11 (10)21 (11)31 (12)41

DIN Rail
Products

RU

All dimensions in mm.

Internal Connection (Bottom View)(13)A1

H

4.4

6.4
12.7

4.1

(9)11 (10)21 (11)31 (12)41

oles

13.2

Marking plate removal slot is provided only on one side.
Insert a flat screwdriver into the slot to remove the marking plate.

RU4S-∗D/RU42S-∗DWith Diode

AUTO-ID

Relays27.5

Mounting Hole Layout

RU4S-∗/RU42S-∗
Standard

Sensors

21.0

13

8

12
10
9

7
6

3
2

10
9

5

6

13

2

1

21.0

4

2.6

0.5

Operator
Interfaces

11

6.4
14

0.5

11

8

12

ø1.2 × 2.2 Hole

5

7

0.5

1

3

21.0

4

0.5

35.0

Marking Plate
Removal Slot

35.0

Marking Plate
Removal Slot

(14)A224V DC or less

RU4S-NF-∗/RU4V-NF-∗
RU42S-NF-∗/RU42V-NF-∗
(1)12

(2)22

(3)32

(4)42

(5)14

(6)24

(7)34

(8)44

(9)11 (10)21 (11)31 (12)41(13)A1(14)A2

Blank or C comes in place of ∗ to represent types with or without a latching lever.

H-020

RU Series Universal Relays
Relays & Sockets

Electrical Life Curves
RU4 (Resistive Load)

Control Boxes

100

10

Emergency
Stop Switches
Enabling
Switches
Safety Products

100

10

1
1

0.1

0.5

1

3

0.02

0.1

6

0.5

1

3

6

Load Current (A)Load Current (A)RU4 (Inductive Load)

RU42 (Inductive Load)

250V AC
30V DC
110V DC

250V AC
30V DC
110V DC

Explosion Proof
Terminal Blocks

250V AC
30V DC
110V DC(× 10,000 operations)Switches &Pilot Lights(× 10,000 operations)

1000

APEM

RU42 (Resistive Load)

250V AC
30V DC
110V DC1000

LED Illumination

100

10

Controllers

10
AC: cos ø = 0.3
DC: L/R = 7 ms

AC: cos ø = 0.3
DC: L/R = 7 ms

Operator
Interfaces

1
1

0.1

0.5

1

3

AUTO-ID

Maximum Switching Current
RU4 (Rated Load)
AC inductive(cos ø = 0.3)

RU42
AC resistive

AC resistive

AC inductive(cos ø = 0.3)

6

6

6

3

3

3

Load Current (A)Load Current (A)0.5

RU4 (Maximum Load)AC resistive

Sockets

0.1

Load Current (A)Load Current (A)Relays0.02

6

Sensors

DIN Rail
Products

100

1

DC resistive
DC inductive
L/R = 7 ms

0.1

Load Current (A)Power Supplies(× 10,000 operations)

Circuit
Protectors(× 10,000 operations)

Relays & Sockets

1

DC resistive
DC inductive
L/R = 7 ms

0.1

AC inductive(cos ø = 0.3)

1

DC resistive
DC inductive
L/R = 7 ms

0.1

RJ
RU
10

RV8H

100

250 500

10

30

100

10

250 500

30

100

250 500

Load Voltage (V)Load Voltage (V)Ambient Temperature vs. Temperature Rise Curves
RU4/RU42 (AC Coil, 60 Hz)

RU4/RU42 (DC Coil)

120

120

120

110

110

110

100

100

100

90

90

90

80

Temperature Rise (°C)

Temperature Rise (°C)

RU4/RU42 (AC Coil, 50 Hz)

Load current
6A × 2 poles

70
60
50
40
30

Load current
3A × 4 poles

70

Load current
6A × 2 poles

60
50
40
20

Load current
3A × 4 poles

10

20

30

40

50

Ambient Temperature (°C)

60

70

0

20

70

30

40

50

Ambient Temperature (°C)

Load current
6A × 2 poles

60
50
40
20

No load current

10

80

30

10

10
0

80

30

No load current

20

Temperature Rise (°C)

RL

30

Load Voltage (V)Load current
3A × 4 poles

No load current

10
60

70

0

10

20

30

40

50

60

70

Ambient Temperature (°C)

The above temperature rise curves show the characteristics when 100% the rated coil voltage is applied.
Load current 6A × 2 poles is for the RU4 only.
The heat resistance of the coil is 120°C. The slant dashed line indicates the allowable temperature rise for the coil at different ambient temperatures.

H-021

RU Series Universal Relays
Relays & Sockets

Applicable Socket
Relay

Wiring Style

Shape

Part No.
SM2S-05B

SM2S-05C(*1)
Front Wiring Socket(*2)

SN2S-05D

Rated Current

7A

7A (UL: 10A)

10A

Style

Applicable Spring
Hold-down Spring
Wire Spring

Standard

Finger-safe

SFA-202
SFA-101—

Switches &Pilot Lights

Standard

Control Boxes

SFA-503
SM2S-05DF
(*1)

10A

APEM

Finger-safe—

Emergency
Stop Switches
Enabling
Switches
Safety Products

RU2
SU2S-21L

12A

Push-in (*3)—

SU9Z-S21R

Explosion Proof
Terminal Blocks

SM2S-51

Rear Wiring Socket

SM2S-61

10A

10A

Solder

PC board

Relays & Sockets

SFA-301
SFA-302

SY4S-51F1

Circuit
Protectors
Power Supplies
LED Illumination

SM2S-6210A

SY4S-05B

7A

SY4S-05C(*1)

7A

PC board

Controllers

SFA-504

SY4S-51F1

Sensors

Standard

Finger-safe

Operator
Interfaces

SFA-202
SFA-101

AUTO-ID—

RelaysFront Wiring Socket(*2)

SN4S-05D

6A

Standard

SFA-502—

Sockets
DIN Rail
Products

SY4S-05DF
(*1)

6A

RU4
RU42
SU4S-21L

8A

Finger-safe

Push-in (*3)

SFA-502—
RJ—

SU9Z-S21R

RU
RV8H

SY4S-51

Rear Wiring Socket

7A

SY4S-61

7A

SY4S-62

7A

Solder

PC board

PC board

RL

SFA-301
SFA-302

SY4S-51F1

SFA-504

SY4S-51F1*1) Finger-safe cannot be used with ring terminal.
*2) Front wiring socket can be mounted directly on DIN rail and mounting panel (some sockets need spacers for the ends).
*3) SU2S-21L and SU4S-21L are Push-in socket which does not require tightening screws. Stranded wire, solid wire, and ferrule can be attached using a screwdriver.

H-022

RU Series Universal Relays
Relays & Sockets

Hold-down Springs
Style

Shape

Material

Wire Spring

Part No.

Ordering No.

SY4S-51F1

SY4S-51F1PN10

SFA-101

SFA-101PN20

SFA-202

SFA-202PN20

SFA-301

SFA-301PN20

Package Quantity

10

APEM
Switches &Pilot Lights
Control Boxes
Emergency
Stop Switches
Enabling
Switches
Safety Products
Explosion Proof
Terminal Blocks
Relays & Sockets
Circuit
Protectors
Power Supplies

10 pairs

Stainless SteelLeaf Spring

SFA-302

SFA-302PN20

SFA-502

SFA-502PN20

SFA-503

SFA-503PN20

SFA-504

SFA-504PN10

LED Illumination
Controllers
Operator
Interfaces
Sensors
AUTO-ID

RelaysSockets
DIN Rail
Products

RJ
RU
RV8H
RL

H-023

• A relay needs a pair of leaf springs, except for SFA-504 (one spring per relay).
• When the wire spring SY4S-51F1 or leaf spring SFA-504 is used on a relay with latcing lever, lever cannot be opened or closed.
• Leaf springs (except for the leaf spring SFA-504) cannot be removed after being installed on a socket.

10

RU Series Universal Relays
Relays & Sockets

Accessories for Sockets
Name

Shape

Specifications
Aluminum
Weight: Approx. 200g

DIN Rail

Ordering No.

Package
Quantity

BAA1000

BAA1000PN10

10

BNL5

BNL5PN10

10Part No.

Zinc-plated steel
Weight: Approx. 15g

End Clip

Plastic (black)

DIN Rail Spacer

Remarks
Length: 1m
Width: 35 mm

APEM

Used on a DIN rail to fasten relay
sockets
BNL6

BNL6PN1010

SA-406B

SA-406B

1

Thickness: 5 mm
Used for adjusting spacing between
sockets mounted on a DIN rail

Switches &Pilot Lights
Control Boxes
Emergency
Stop Switches
Enabling
Switches
Safety Products
Explosion Proof

SA-203B
End Spacer2
Jumper(for 2-polesocket)Rated current: 10A (*1)

58

1Used for mounting DIN rail mountsockets directly on a panel surface

Brass(Nickel-plated)with polyprene sheathSA-204B

SA-204B

SM9Z-JF2

SM9Z-JF2PN10

SM9Z-JF5

SM9Z-JF5PN10

SM9Z-JF8

SM9Z-JF8PN10

1

10
SY9Z-JF2

SY9Z-JF2PN105

SY9Z-JF5

SY9Z-JF5PN10

8

SY9Z-JF8

SY9Z-JF8PN10

2Jumper(for 4-polesocket)SA-203B

Plastic (black)

Terminal Blocks
Relays & Sockets
Circuit
Protectors

Used for interconnecting relay coilterminals on SM2S-05DF sockets;
can be cut to required length.
No. of sockets:
SM9Z-JF2: 2 SM9Z-JF5: 5
SM9Z-JF8: 8
Used for interconnecting relay coilterminals on SY4S-05DF sockets;
can be cut to required length
SY9Z-JF2: 2 SY9Z-JF5: 5
SY9Z-JF8: 8

Power Supplies
LED Illumination
Controllers
Operator
Interfaces
Sensors
AUTO-ID*1) Ensure that the total current to the jumper does not exceed the rated current.
RelaysSockets
DIN Rail
Products

RJ
RU
RV8H
RL

H-024

RU Series Universal Relays
Relays & Sockets

Safety Precautions

APEM
Switches &Pilot Lights
Control Boxes
Emergency
Stop Switches
Enabling
Switches• Turn off the power to the relay before starting installation, removal,
wiring, maintenance, and inspection of the relays. Failure to turnpower off may cause electrical shock or fire hazard.
• Observe specifications and rated values, otherwise electri­cal shock orfire hazard may be caused.
• Use wires of the proper size to meet the voltage and cur­rent requirements. Tighten the terminal screws on the relay socket to the proper
tightening torque.
• Before operating the latching lever, 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 toterminals 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.
• The surge absorbing element on AC relays with RC or DC relays. withdiode is provided to absorb the counter 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 anothersurge absorbing provision to the relay to prevent damage.

Safety Products
Explosion Proof

Instructions

Terminal Blocks

Driving Circuit for Relays

Relays & Sockets

1. To make sure of correct relay operation, apply rated volt­age to therelay coil.
2. Input voltage for the DC coil:
A complete DC voltage is best for the coil power to make sure ofstable relay operation. When using a power supply containing aripple voltage, suppress the ripple factor within 5%. When poweris supplied through a rectification circuit, the relay operating
characteristics, such as pickup voltage and dropout voltage, dependon the ripple factor. Connect a smoothing capacitor for better
operating char­acteristics as shown below.

Circuit
Protectors
Power Supplies
LED Illumination
Controllers
Operator
Interfaces
Sensors+–

Sockets

RU
RV8H
RL

DC

Emin Emax Emean
Ripple factor (%) =Emax – Emin
×100%
Emean

Emax = Maximum of pulsating current
Emin = Minimum of pulsating current
Emean = DC mean value

Correct
TE

R

R

Io

5. Surge suppression for transistor driving circuits:
When the relay coil is turned off, a high-voltage pulse is generated,causing the transistor to deteriorate and sometimes to break. Be
sure to connect a diode to sup­press the counter electromotive force.
Then, the coil release time becomes slightly longer. To shorten thecoil release time, connect a Zener diode between the collector andemitter of the transistor. Select a Zener diode with a Zener voltage
slightly higher than the power voltage.
Counter emf
suppressing diode+3. Operating the relay in synchronism with AC load:
If the relay operates in synchronism with the AC power voltage ofthe load, the relay life may be reduced. If this is the case, selecta relay in consideration of the required reliability for the load. Or,
make the relay turn on and off irrespective of the AC power phase ornear the point where the AC phase crosses zero voltage.
R
Vin

EAC
Vin

H-025

R Relay

Pulsation

RelaysRJ

Incorrect

Smoothingcapacitor

AUTO-ID

DIN Rail
Products

4. Leakage current while relay is off:
When driving an element at the same time as the relay operation,a special consideration is needed for the circuit design. As shownin the incorrect circuit below, Leakage current (Io) flows throughthe relay coil while the relay is off. Leakage current causes the coilrelease failure or adversely affects the vibration resistance andshock resis­tance. Design a circuit as shown in the correct example.

TE
Load

EAC

–

R RelayRU Series Universal Relays
Relays & Sockets

Instructions
Protection for Relay Contacts

Other Precautions

1. The contact ratings show maximum values. Make sure that thesevalues are not exceeded. When an inrush cur­rent flows through theload, the contact may become welded. If this is the case, connect acontact protection circuit, such as a current limiting resistor.
2. Contact protection circuit:
When switching an inductive load, arcing causes carbides to formon the contacts, resulting in an increased contact resistance.
In consideration of contact reliability, contact life, and noise
suppression, use of a surge absorbing cir­cuit is recommended. Notethat the release time of the load becomes slightly longer. Check theoperation using the actual load. Incorrect use of a contact protection
cir­cuit will adversely affect switching characteristics. Four typicalexamples of contact protection circuits are shown in the following
table:

1. General notice:
To maintain the initial characteristics, do not drop the relay or shock
the relay.
The relay cover cannot be removed from the base during normal
operation. To maintain the initial characteristics, do not remove therelay cover.
Use the relay in environments free from condensation of dust, sulfur
dioxide (SO2), and hydrogen sulfide (H2S).
Make sure that the coil voltage does not exceed the appli­cable coilvoltage range.
2. Connecting outputs to electronic circuits:
When the output is connected to a load which responds very
quickly, such as an electronic circuit, contact bounc­ing causes
incorrect operation of the load. Take the follow­ing measures into
consideration.
Connect an integral circuit.
Suppress the pulse voltage due to bouncing within the noise marginof the load.
3. UL- and CSA-approved ratings may differ from product rated values
determined by IDEC.
4. Do not use relays in the vicinity of strong magnetic field as this may
affect relay operation.
DC diode type has polarity.
The surge absorbing element on AC relays with RC or DC relays
with diode is provided to absorb the counter electro­motive force
generated by the coil. When the relay is sub­ject to an excessive
external surge voltage, the surge absorbing element may bedamaged. Add another surge absorbing provision to the relay toprevent damage.

C R

Ind. Load

RC

Power

This protection circuit can be used when
the load impedance is smaller than the RC
impedance in an AC load power circuit.
R: Resistor of approximately the same
resistance value as the load
C: 0.1 to 1 µF

Varistor

Diode

Power

C
R

Ind. LoadInd. Load

This protection circuit can be used for DC
load power circuits. Use a diode with thefollowing ratings.
Reverse withstand voltage:
Power voltage of the load circuit × 10
Forward current:More than the load current

Ind. Load

This protection circuit can be used for both
AC and DC load power circuits.
For a best result, when using on a power
voltage of 24 to 48V AC/DC, connect avaristor across the load. When using on a
power voltage of 100 to 240V AC/DC, connect
a varistor across the contacts.

+
Power

D

–

Power

Varistor

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

C
Power

Load

Load

Switches &Pilot Lights
Control Boxes
Emergency
Stop Switches
Enabling
Switches
Safety Products
Explosion Proof
Terminal Blocks
Relays & Sockets
Circuit
Protectors
Power Supplies
LED Illumination
Controllers
Operator
Interfaces
Sensors
AUTO-ID

RelaysSockets
DIN Rail
Products

RJ

3. Do not use a contact protection circuit as shown below:

C
Power

APEM

RU

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 areclosed, the capacitor is discharged through the contacts,
increasing the possibility of contact welding.

RV8H
RL

This protection circuit is very effective in arc sup­pression
when opening the contacts. But, when the contacts areclosed, a current flows to charge the capacitor, causing
contact welding.

Generally, switching a DC inductive load is more difficult thanswitching a DC resistive load. Using an appropriate arc suppressor,
however, will improve the switching char­acteristics of a DC inductive
load.

SAPEN01A_H RU June 2024

H-026

Ordering Terms and Conditions
Thank you for using IDEC Products.
By purchasing products listed in our catalogs, datasheets, and the like (hereinafter referred to as “Catalogs”) you agree to be bound by these terms and conditions. Please readand agree to the terms and conditions before placing your order.

1. Notes on contents of Catalogs

3. Inspections(1) Rated values, performance values, and specification values of IDEC products
listed in this Catalog are values acquired under respective conditions in
independent testing, and do not guarantee values gained in combined
conditions.
Also, durability varies depending on the usage environment and usage
conditions.
(2) Reference data and reference values listed in Catalogs are for reference
purposes only, and do not guarantee that the product will always operate
appropriately in that range.
(3) The specifications / appearance and accessories of IDEC products listed in
Catalogs are subject to change or termination of sales without notice, for
improvement or other reasons.
(4) The content of Catalogs is subject to change without notice.

2. Note on applications(1) If using IDEC products in combination with other products, confirm theapplicable laws / regulations and standards.
Also, confirm that IDEC products are compatible with your systems, machines,
devices, and the like by using under the actual conditions. IDEC shall bear no
liability whatsoever regarding the compatibility with IDEC products.
(2) The usage examples and application examples listed in Catalogs are forreference purposes only. Therefore, when introducing a product, confirm theperformance and safety of the instruments, devices, and the like before use.
Furthermore, regarding these examples, IDEC does not grant license to use
IDEC products to you, and IDEC offers no warranties regarding the ownershipof intellectual property rights or non-infringement upon the intellectual
property rights of third parties.
(3) When using IDEC products, be cautious when implementing the following.
i. Use of IDEC products with sufficient allowance for rating and 		
performanceii.	Safety design, including redundant design and malfunction prevention
design that prevents other danger and damage even in the event that an
IDEC product failsiii.	Wiring and installation that ensures the IDEC product used in yoursystem, machine, device, or the like can perform and function according
to its specifications(4) Continuing to use an IDEC product even after the performance has
deteriorated can result in abnormal heat, smoke, fires, and the like due toinsulation deterioration or the like. Perform periodic maintenance for IDEC
products and the systems, machines, devices, and the like in which they areused.
(5) IDEC products are developed and manufactured as general-purpose products
for general industrial products. They are not intended for use in the following
applications, and in the event that you use an IDEC product for theseapplications, unless otherwise agreed upon between you and IDEC, IDEC shallprovide no guarantees whatsoever regarding IDEC products.
i.	Use in applications that require a high degree of safety, including nuclear
power control equipment, transportation equipment (railroads / airplanes/ ships / vehicles / vehicle instruments, etc.), equipment for use in outerspace, elevating equipment, medical instruments, safety devices, or
any other equipment, instruments, or the like that could endanger life or
human healthii.	Use in applications that require a high degree of reliability, such asprovision systems for gas / waterworks / electricity, etc., systems that
operate continuously for 24 hours, and settlement systems
iii.	Use in applications where the product may be handled or used deviatingfrom the specifications or conditions / environment listed in the Catalogs,
such as equipment used outdoors or applications in environments
subject to chemical pollution or electromagnetic interference
If you would like to use IDEC products in the above applications, be sure
to consult with an IDEC sales representative.

Head Office
USA
EMEA

We ask that you implement inspections for IDEC products you purchase without
delay, as well as thoroughly keep in mind management/maintenance regarding
handling of the product before and during the inspection.

4. Warranty(1) Warranty period
The warranty period for IDEC products shall be one (1) year after purchase ordelivery to the specified location. However, this shall not apply in cases where
there is a different specification in the Catalogs or there is another agreementin place between you and IDEC.
(2) Warranty scope
Should a failure occur in an IDEC product during the above warranty period
for reasons attributable to IDEC, then IDEC shall replace or repair that
product, free of charge, at the purchase location / delivery location of the
product, or an IDEC service base. However, failures caused by the following
reasons shall be deemed outside the scope of this warranty.
i.	The product was handled or used deviating from the conditions / 		environment listed in the Catalogs
ii. The failure was caused by reasons other than an IDEC productiii. Modification or repair was performed by a party other than IDEC
iv.	The failure was caused by a software program of a party other than 		IDEC
v. The product was used outside of its original purposevi.	Replacement of maintenance parts, installation of accessories, or the like
was not performed properly in accordance with the user’s manual and
Catalogs
vii.	The failure could not have been predicted with the scientific and 		technical standards at the time when the product was shipped from
IDEC
viii.	The failure was due to other causes not attributable to IDEC (including
cases of force majeure such as natural disasters and other disasters)
Furthermore, the warranty described here refers to a warranty on the IDEC
product as a unit, and damages induced by the failure of an IDEC product are
excluded from this warranty.

5. Limitation of liability
The warranty listed in this Agreement is the full and complete warranty for IDEC
products, and IDEC shall bear no liability whatsoever regarding special damages,
indirect damages, incidental damages, or passive damages that occurred due to an
IDEC product.

6. Service scope
The prices of IDEC products do not include the cost of services, such as dispatching
technicians. Therefore, separate fees are required in the following cases.
(1) Instructions for installation / adjustment and accompaniment at test operation(including creating application software and testing operation, etc.)(2) Maintenance inspections, adjustments, and repairs(3) Technical instructions and technical training(4) Product tests or inspections specified by you
The above content assumes transactions and usage within your region. Please
consult with an IDEC sales representative regarding transactions and usage outsideof your region. Also, IDEC provides no guarantees whatsoever regarding IDEC
products sold outside your region.

www.idec.com

6-64, Nishi-Miyahara-2-Chome, Yodogawa-ku, Osaka 532-0004, JapanIDEC Corporation
APEM SAS

Singapore
ThailandIndia

IDEC Izumi Asia Pte. Ltd.
IDEC Asia (Thailand) Co., Ltd.
IDEC Controls India Private Ltd.

Specifications and other descriptions in this brochure are subject to change without notice.
2024 IDEC Corporation, All Rights Reserved.

China
TaiwanIDEC (Shanghai) Corporation
IDEC Izumi (H.K.) Co., Ltd.
IDEC Taiwan CorporationJapan

IDEC Corporation