The document provides technical specifications and details for Werner's 20 series power relays, designed for high performance and reliability in industrial applications. It highlights features such as extensive model options, durability, and compliance with international standards, along with detailed model number structures and selection criteria. The relays are suitable for various electrical environments and applications, supporting multiple voltage configurations and operational types.

1. Living Industrial Partnerships
PRODUCT SPECIFICATIONS
Power Relays
20Series

2. 20 Series Power Relays
Technical Data .......................................................................................................................20/1
Specification .........................................................................................................................20/2
Model Number Structure ........................................................................................................20/3
Model Number Selection - Blade Type .......................................................................20/4 - 20/5
Model Number Selection - PC Board Type ...............................................................20/6 - 20/7
Accessories & Electrical Characteristics ..................................................................20/8 - 20/10
Dimensions Details .................................................................................................................20/11
Internal Connection (Bottom View) ........................................................................................20/12
Protection & Safety Precautions ................................................................................20/13 - 20/14
20 Series Power Relays

3. 20 Series Power Relays
Power Relays
WERNER`s 20 Series General Purpose & Power Relays represent the most complete line of state-of-the-art high
performance electrical Relays, designed and manufactured to highest international industry standards.
Mechanical lifetimes of up to 10 Million operations and electrical durability of up to 250.000 switching cycles under
full load make WERNER Relays your best choice of all.
Features Overview
? All models designed applying MFMS design principles (Max Function Min Space)
? All models designed applying solid modeling and finite elements design methods
? All Power Relay Series are equipped with mechanical operation status indicator
? All models approved under UL, CE, RoHS, CCC and DEMKO standards
? All models design for heavy duty or even vibrating environments
? All models available for use with 50 Hz and 60 Hz cycles
Highlights
? All fixed contacts powered by WERNER AFT (Anti-Fuse-Technology)
? All Power Relays Series provide massive silver blade or pin contacts
? Power Relay Series with up to 10 Ampere Continuous Load Current
? Most models available in 6V, 12V, 24V, 110V & 220V AC or DC
? Most models available in SPDT, DPDT, 3PDT as well as 4DPT
? Up to 7 types of operation status indication available
20 Series General Purpose & Power Relays by WERNER provide our highly demanding industrial customers out of
all industry verticals worldwide with the most reliable devices in the industry. Combined with the vast selection of
sockets in our 70 – 75 Product Series you will find an industrial solution exceeding your expectations whilst
satisfying you're every need and design requirement.
20 Series Power Relays

4. 20 Series Power Relays
20 Series Power Relays
Features:
Power Relays
Dielectric strength 2,000V
Compact and small
Contact Capacity of 10A
Built-in Diode models
Large Capacity
DPDT, 3PDT & 4PDT
Approvals Overvoltage category
Approbations and Declaration of conformity III, as per EN IEC 60947-5-1
UL
R
CE
RoHS
CCC S
Demko
AC Coil Ratings
Rated Current (mA)
Coil Resistance (Ù) Operation Properties
Voltage AC 60Hz AC 50Hz +/- 10%
Continuous Pickup Dropout
DPDT 3PDT 4PDT DPDT 3PDT 4PDT DPDT 3PDT 4PDT Voltage Voltage Voltage
6V 200 280 330 240 330 390 12.0 5 4
12V 100 140 170 121 165 196 46.0 20 16
24V 50 70 83 60.5 81 98 180.0 81 63
48V 25 35 42 30 41 48 780.0 322 252 110% 80% 30%
110V – 15.5 20 – 18.1 21.6 – 1694 1323 max. max. min.
120V – 14.2 19 – 16.4 19.5 – 2258 1760
220V – 7.7 9.8 – 10 12.06 – 6770 5290
240V – 7.1 8.9 – 8.2 9.8 – 8650 7120
±15% at 20°C
DC Coil Ratings
Rated Current (mA) Coil Resistance (Ù) Operation Properties
Voltage +/- 10%
DPDT 3PDT 4PDT DPDT 3PDT 4PDT Continuous Voltage Pickup Voltage Dropout Voltage
6V 150 240 250 40 25 24
12V 75 120 125 160 100 96
24V 36.9 60 62 650 400 388
48V 18.5 30 31 2.600 1.600 1.550
110% max. 80% max. 10% min.
110V – 12.8 15 – 8.600 7.340
120V
220V
240V
±15% at 20°C
Weight
Model No. 20.12 & 20.22 (DPDT) 20.13 & 20.23 (3PDT) 20.14 & 20.24 (4PDT)
Weight (approx.) 37g 50g 74g
20 Series Power Relays 20/1

5. *Note: P level: ë60= 0.1x10-6/Opeartion,reference value.
1800 operations/hour maximum
1800 operations/hour maximum
20/2

6. 20 Series Power Relays
Model Number Structure - Power Relays
20.13.11.120
Series Voltage
20 Series Power Relays 006 6V
012 12V
024 24V
Terminal Type 048 48V
110 110V
1 Blade
120 120V
2 PC Board
220 220V
240 240V
Number of Poles
2 DPDT Coil
3 3PDT
1 AC
4 4PDT
2 DC
Types
0 Basic
1 LED
2 LED & Diode DC Only
3 LED & Check button
4 LED & Check button & Diode DC Only
5 LED & RC AC Only
6 LED & Check button & RC AC Only
20 Series Power Relays 20/3

7. 20 Series Power Relays
Model Number Selection
Model No.
Terminal
Appearance Types Voltage DPDT
Type
AC
6V 20.12.01.006
12V 20.12.01.012
24V 20.12.01.024
48V 20.12.01.048
Basic
110V 20.12.01.110
120V 20.12.01.120
220V 20.12.01.220
240V 20.12.01.240
6V 20.12.11.006
12V 20.12.11.012
24V 20.12.11.024
48V 20.12.11.048
LED
110V 20.12.11.110
120V 20.12.11.120
DPDT 220V 20.12.11.220
240V 20.12.11.240
6V –
12V –
24V –
48V –
LED & Diode
110V –
120V –
220V –
240V –
6V 20.12.31.006
12V 20.12.31.012
24V 20.12.31.024
LED & 48V 20.12.31.048
Blade
Check button 110V 20.12.31.110
120V 20.12.31.120
220V 20.12.31.220
240V 20.12.31.240
3PDT
6V –
12V –
24V –
LED & 48V –
Diode &
110V –
Check button
120V –
220V –
240V –
6V 20.12.51.006
12V 20.12.51.012
24V 20.12.51.024
48V 20.12.51.048
LED & RC
110V 20.12.51.110
120V 20.12.51.120
220V 20.12.51.220
240V 20.12.51.240
6V 20.12.61.006
4PDT
12V 20.12.61.012
24V 20.12.61.024
LED & 48V 20.12.61.048
RC &
110V 20.12.61.110
Check button
120V 20.12.61.120
220V 20.12.61.220
240V 20.12.61.240
20/4
20 Series Power Relays

8. 20 Series Power Relays
Model Number Selection
Model No. Model No. Model No.
DPDT 3PDT 4PDT
DC AC DC AC DC
20.12.02.006 20.13.01.006 20.13.02.006 20.14.01.006 20.14.02.006
20.12.02.012 20.13.01.012 20.13.02.012 20.14.01.012 20.14.02.012
20.12.02.024 20.13.01.024 20.13.02.024 20.14.01.024 20.14.02.024
20.12.02.048 20.13.01.048 20.13.02.048 20.14.01.048 20.14.02.048
20.12.02.110 20.13.01.110 20.13.02.110 20.14.01.110 20.14.02.110
20.12.02.120 20.13.01.120 20.13.02.120 20.14.01.120 20.14.02.120
20.12.02.220 20.13.01.220 20.13.02.220 20.14.01.220 20.14.02.220
20.12.02.240 20.13.01.240 20.13.02.240 20.14.01.240 20.14.02.240
20.12.12.006 20.13.11.006 20.13.12.006 20.14.11.006 20.14.12.006
20.12.12.012 20.13.11.012 20.13.12.012 20.14.11.012 20.14.12.012
20.12.12.024 20.13.11.024 20.13.12.024 20.14.11.024 20.14.12.024
20.12.12.048 20.13.11.048 20.13.12.048 20.14.11.048 20.14.12.048
20.12.12.110 20.13.11.110 20.13.12.110 20.14.11.110 20.14.12.110
20.12.12.120 20.13.11.120 20.13.12.120 20.14.11.120 20.14.12.120
20.12.12.220 20.13.11.220 20.13.12.220 20.14.11.220 20.14.12.220
20.12.12.240 20.13.11.240 20.13.12.240 20.14.11.240 20.14.12.240
20.12.22.006 – 20.13.22.006 – 20.14.22.006
20.12.22.012 – 20.13.22.012 – 20.14.22.012
20.12.22.024 – 20.13.22.024 – 20.14.22.024
20.12.22.048 – 20.13.22.048 – 20.14.22.048
20.12.22.110 – 20.13.22.110 – 20.14.22.110
20.12.22.120 – 20.13.22.120 – 20.14.22.120
20.12.22.220 – 20.13.22.220 – 20.14.22.220
20.12.22.240 – 20.13.22.240 – 20.14.22.240
20.12.32.006 20.13.31.006 20.13.32.006 20.14.31.006 20.14.32.006
20.12.32.012 20.13.31.012 20.13.32.012 20.14.31.012 20.14.32.012
20.12.32.024 20.13.31.024 20.13.32.024 20.14.31.024 20.14.32.024
20.12.32.048 20.13.31.048 20.13.32.048 20.14.31.048 20.14.32.048
20.12.32.110 20.13.31.110 20.13.32.110 20.14.31.110 20.14.32.110
20.12.32.120 20.13.31.120 20.13.32.120 20.14.31.120 20.14.32.120
20.12.32.220 20.13.31.220 20.13.32.220 20.14.31.220 20.14.32.220
20.12.32.240 20.13.31.240 20.13.32.240 20.14.31.240 20.14.32.240
20.12.42.006 – 20.13.42.006 – 20.14.42.006
20.12.42.012 – 20.13.42.012 – 20.14.42.012
20.12.42.024 – 20.13.42.024 – 20.14.42.024
20.12.42.048 – 20.13.42.048 – 20.14.42.048
20.12.42.110 – 20.13.42.110 – 20.14.42.110
20.12.42.120 – 20.13.42.120 – 20.14.42.120
20.12.42.220 – 20.13.42.220 – 20.14.42.220
20.12.42.240 – 20.13.42.240 – 20.14.42.240
– 20.13.51.006 – 20.14.51.006 –
– 20.13.51.012 – 20.14.51.012 –
– 20.13.51.024 – 20.14.51.024 –
– 20.13.51.048 – 20.14.51.048 –
– 20.13.51.110 – 20.14.51.110 –
– 20.13.51.120 – 20.14.51.120 –
– 20.13.51.220 – 20.14.51.220 –
– 20.13.51.240 – 20.14.51.240 –
– 20.13.61.006 – 20.14.61.006 –
– 20.13.61.012 – 20.14.61.012 –
– 20.13.61.024 – 20.14.61.024 –
– 20.13.61.048 – 20.14.61.048 –
– 20.13.61.110 – 20.14.61.110 –
– 20.13.61.120 – 20.14.61.120 –
– 20.13.61.220 – 20.14.61.220 –
– 20.13.61.240 – 20.14.61.240 –
20 Series Power Relays 20/5

9. 20 Series Power Relays
Model Number Selection
Model No.
Terminal
Appearance Types Voltage DPDT
Type
AC
– 20.22.01.006
– 20.22.01.012
– 20.22.01.024
– 20.22.01.048
Basic – 20.22.01.110
– 20.22.01.120
– 20.22.01.220
– 20.22.01.240
– 20.22.11.006
– 20.22.11.012
– 20.22.11.024
– 20.22.11.048
LED
110V 20.22.11.110
120V 20.22.11.120
DPDT 220V 20.22.11.220
240V 20.22.11.240
6V –
12V –
24V –
48V –
LED & Diode
110V –
120V –
220V –
240V –
6V 20.22.31.006
12V 20.22.31.012
24V 20.22.31.024
LED & 48V 20.22.31.048
PC Board
Check button 110V 20.22.31.110
120V 20.22.31.120
220V 20.22.31.220
240V 20.22.31.240
3PDT
6V –
12V –
24V –
LED & 48V –
Diode &
110V –
Check button
120V –
220V –
240V –
6V 20.22.51.006
12V 20.22.51.012
24V 20.22.51.024
48V 20.22.51.048
LED & RC
110V 20.22.51.110
120V 20.22.51.120
220V 20.22.51.220
240V 20.22.51.240
6V 20.22.61.006
4PDT
12V 20.22.61.012
24V 20.22.61.024
LED & 48V 20.22.61.048
RC &
110V 20.22.61.110
Check button
120V 20.22.61.120
220V 20.22.61.220
240V 20.22.61.240
20/6
20 Series Power Relays

10. 20 Series Power Relays
Model Number Selection
Model No. Model No. Model No.
DPDT 3PDT 4PDT
DC AC DC AC DC
20.22.02.006 20.23.01.006 20.23.02.006 20.24.01.006 20.24.02.006
20.22.02.012 20.23.01.012 20.23.02.012 20.24.01.012 20.24.02.012
20.22.02.024 20.23.01.024 20.23.02.024 20.24.01.024 20.24.02.024
20.22.02.048 20.23.01.048 20.23.02.048 20.24.01.048 20.24.02.048
20.22.02.110 20.23.01.110 20.23.02.110 20.24.01.110 20.24.02.110
20.22.02.120 20.23.01.120 20.23.02.120 20.24.01.120 20.24.02.120
20.22.02.220 20.23.01.220 20.23.02.220 20.24.01.220 20.24.02.220
20.22.02.240 20.23.01.240 20.23.02.240 20.24.01.240 20.24.02.240
20.22.12.006 20.23.11.006 20.23.12.006 20.24.11.006 20.24.12.006
20.22.12.012 20.23.11.012 20.23.12.012 20.24.11.012 20.24.12.012
20.22.12.024 20.23.11.024 20.23.12.024 20.24.11.024 20.24.12.024
20.22.12.048 20.23.11.048 20.23.12.048 20.24.11.048 20.24.12.048
20.22.12.110 20.23.11.110 20.23.12.110 20.24.11.110 20.24.12.110
20.22.12.120 20.23.11.120 20.23.12.120 20.24.11.120 20.24.12.120
20.22.12.220 20.23.11.220 20.23.12.220 20.24.11.220 20.24.12.220
20.22.12.240 20.23.11.240 20.23.12.240 20.24.11.240 20.24.12.240
20.22.22.006 – 20.23.22.006 – 20.24.22.006
20.22.22.012 – 20.23.22.012 – 20.24.22.012
20.22.22.024 – 20.23.22.024 – 20.24.22.024
20.22.22.048 – 20.23.22.048 – 20.24.22.048
20.22.22.110 – 20.23.22.110 – 20.24.22.110
20.22.22.120 – 20.23.22.120 – 20.24.22.120
20.22.22.220 – 20.23.22.220 – 20.24.22.220
20.22.22.240 – 20.23.22.240 – 20.24.22.240
20.22.32.006 20.23.31.006 20.23.32.006 20.24.31.006 20.24.32.006
20.22.32.012 20.23.31.012 20.23.32.012 20.24.31.012 20.24.32.012
20.22.32.024 20.23.31.024 20.23.32.024 20.24.31.024 20.24.32.024
20.22.32.048 20.23.31.048 20.23.32.048 20.24.31.048 20.24.32.048
20.22.32.110 20.23.31.110 20.23.32.110 20.24.31.110 20.24.32.110
20.22.32.120 20.23.31.120 20.23.32.120 20.24.31.120 20.24.32.120
20.22.32.220 20.23.31.220 20.23.32.220 20.24.31.220 20.24.32.220
20.22.32.240 20.23.31.240 20.23.32.240 20.24.31.240 20.24.32.240
20.22.42.006 – 20.23.42.006 – 20.24.42.006
20.22.42.012 – 20.23.42.012 – 20.24.42.012
20.22.42.024 – 20.23.42.024 – 20.24.42.024
20.22.42.048 – 20.23.42.048 – 20.24.42.048
20.22.42.110 – 20.23.42.110 – 20.24.42.110
20.22.42.120 – 20.23.42.120 – 20.24.42.120
20.22.42.220 – 20.23.42.220 – 20.24.42.220
20.22.42.240 – 20.23.42.240 – 20.24.42.240
– 20.23.51.006 – 20.24.51.006 –
– 20.23.51.012 – 20.24.51.012 –
– 20.23.51.024 – 20.24.51.024 –
– 20.23.51.048 – 20.24.51.048 –
– 20.23.51.110 – 20.24.51.110 –
– 20.23.51.120 – 20.24.51.120 –
– 20.23.51.220 – 20.24.51.220 –
– 20.23.51.240 – 20.24.51.240 –
– 20.23.61.006 – 20.24.61.006 –
– 20.23.61.012 – 20.24.61.012 –
– 20.23.61.024 – 20.24.61.024 –
– 20.23.61.048 – 20.24.61.048 –
– 20.23.61.110 – 20.24.61.110 –
– 20.23.61.120 – 20.24.61.120 –
– 20.23.61.220 – 20.24.61.220 –
– 20.23.61.240 – 20.24.61.240 –
20 Series Power Relays 20/7

11. 20 Series Power Relays
UL - Voltage Ratings
Resistive General
Model
DPDT 3PDT 4PDT DPDT 3PDT 4PDT
240V AC 10A 7.5A 7.5A 7A 6.5A 5A
120V AC – 10A 10A – 7.5A 7.5A
30V DC 10A 10A – 7A – –
28V DC – – 10A – – –
Accessories
DIN Rails
5.5
DIN Rail
35-mm-wide 1000
12.50
77.02.10 12.5 25.18 31.00
3.80
35.00
12.5
35
7.5
25 10.50
1.7
41.00 51.00
77.02.10 31
DIN Rail No. Material Length Weight Width
77.02.10 Aluminum 1000 mm 200 g 35 mm
Socket Specification
Model No.
Mounting Type Terminal Torque Wire Size
2 Poles 3 Poles 4 Poles
With M3 screws - coil Up to 3.5mm²
Finger-safe 0.6 to 1.0 N.m (12AWG) 70.12.01 70.13.01 70.14.01
M3.5 screws - contact
DIN Rail
Without M3 screws - coil Up to 3.5mm²
Finger-safe 0.6 to 1.0 N.m (12AWG) 70.12.00 70.13.00 70.14.00
M3.5 screws - contact
PCB Mount – – – – 70.22.00 70.23.00 70.24.00
Socket
No. of Poles 2 Poles 3 Poles 4 Poles
Voltage 300 V 300 V 300 V
A 10 10 10
20/8
20 Series Power Relays

12. 20 Series Power Relays
Mounting Clips
45
77.03.10
9
Mounting Clips No. Rails Width Weight
77.03.10 77.02.10 45 mm 15.2 g
Applicable Clips
Appearance Description Relay Suitable For DIN Suitable For
Mount Socket PCB Mount Socket
20.12 & 20.22 (DPDT)
Leaf Spring
20.13 & 20.23 (3PDT) 70.03.01 70.03.02
(top latch)
20.14 & 20.24 (4PDT)
20.12 & 20.22 (DPDT) 70.02.21
Wire Spring 20.13 & 20.23 (3PDT) 70.02.31 70.02.02
20.14 & 20.24 (4PDT) 70.02.41
* For suitable relay please check Sockets catalogue.
Switching Capacity
10.0
AC resistive
5.0 AC inductive
Load Current (A)
DC resistive
1.0
DC inductive
0.5
0.1
1 5 10 50 100 200 300
Load Voltage (V)
20.12 & 20.22 | 20.13 & 20.23 | 20.14 & 20.24
DPDT 3PDT 4PDT
20 Series Power Relays 20/9

13. 20 Series Power Relays
Electrical Characteristics
20.12 & 20.22 (DPDT)
AC DC
1000 1000
500 500
120V AC resistive 30V DC resistive
100 100 30V DC inductive
Life (x10,000 operations)
240V AC resistive
Life (x10,000 operations)
50 240V AC inductive 50
100V DC resistive
120V AC inductive
100V DC inductive
20 20
10 10
1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10
Load Current (A) Load Current (A)
20.13 & 20.23 (3PDT)
AC DC
1000 1000
500 500
30V DC resistive
120V AC resistive
100 100
Life (x10,000 operations)
Life (x10,000 operations)
30V DC inductive
50 50
240V AC resistive
240V AC inductive
20 20 100V DC resistive
120V AC inductive
100V DC inductive
10 10
1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10
Load Current (A) Load Current (A)
20.14 & 20.24 (4PDT)
AC DC
1000 1000
500 500
30V DC resistive
120V AC resistive
100 100
Life (x10,000 operations)
Life (x10,000 operations)
30V DC inductive
50 50
240V AC resistive
240V AC inductive
20 20 100V DC resistive
120V AC inductive
100V DC inductive
10 10
1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10
Load Current (A) Load Current (A)
20/10
20 Series Power Relays

14. 20 Series Power Relays
Dimensions
Blade Terminal PC Board Terminal
20.12 (DPDT) 20.22 (DPDT)
14.2
10
4.1
4.7
ø 2.6
27.5
0.5
5.5
21
3.4
6.4
Eight,
35.6 2.5-dia.
max
holes
20.13 (3PDT) 20.23 (3PDT)
10 10
4.1
4.7
27.5
ø 2.6
0.5
31.5 5.5
5.3
6.4
35.6 Eleven,
max 2.5-dia.
holes
20.14 (4PDT) 20.24 (4PDT)
10 10 10
4.1
4.7
4.6
27.5
ø 2.6 13.15
7.15
0.5
41
5.5
6.4 5.3
35.6 Fourteen,
max
2.5-dia.
holes
20 Series Power Relays 20/11

15. 20 Series Power Relays
Basic Type - Internal Connection (Bottom View)
DPDT 3PDT 4PDT
1 4 1 2 3 1 2 3 4
5 8 4 5 6 5 6 7 8
9 12 7 8 9 9 10 11 12
13(-) 14(+) 10(-) 11(+) 13(-) 14(+)
LED Type - Internal Connection (Bottom View)
DPDT 3PDT 4PDT
1 4 1 2 3 1 2 3 4
5 8 4 5 6 5 6 7 8
9 12 7 8 9 9 10 11 12
LED & Diode Type - Internal Connection (Bottom View)
DPDT 3PDT 4PDT
1 4 1 2 3 1 2 3 4
5 8 4 5 6 5 6 7 8
9 12 7 8 9 9 10 11 12
13( – ) ( + )14 10( – ) ( + )11 13( – ) ( + )14
LED & RC Type - Internal Connection (Bottom View)
DPDT 3PDT 4PDT
1 4 1 2 3 1 2 3 4
5 8 4 5 6 5 6 7 8
9 12 7 8 9 9 10 11 12
20/12
20 Series Power Relays

16. 20 Series Power Relays
Instructions
Apply rated voltage to the relay coil to ensure correct relay type.
When using a power supply containing a ripple voltage, suppress
the ripple factor within 6% however, a complete DC voltage is best for the coil
power to make sure of stable relay operation.
+
Pickup voltage and dropout voltage depend on the ripple factor R
–
when power is supplied through a rectification
circuit. Include a smoothing capacitor for better
operation.
Special consideration should be taken when driving an element at the Incorrect Correct
same time as the relay operation for the circuit design. Leakage current (Io)
TE
flows through the relay coil while the relay is off. Leakage current causes coil R
release failure or adversely affects the vibration resistance and shock Io
resistance. It is advisable to design a circuit as shown.
Connecting a diode to suppress at the back electromotive force prevents a Back emf suppressing diode
high-voltage pulse which is generated when the relay coil is turned off, causing
transistor to deteriorate or break, make sure the coil release time is slightly longer.
To shorten the coil release time, connect a Zener diode which is slightly higher
than the power voltage, between the collector and emitter of the transistor.
Protection
When an inrush current flows through the load, the contact may become welded. The contact ratings show maximum values,
Make sure that these values are not exceeded. Contact a contact protection circuit, such as a current limiting resistor
as a optional solution.
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
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 load circuit x 10
Forward current: More than the load current.
Prevents
This protection circuit is very effective in arc suppression when
opening the contact however, the capacitor is charged while the
contacts are opened else the capacitor is discharged through the
contacts, increasing the possibility of contact welding.
This protection circuit is very effective in arc suppression when
opening the contact however, a current flows to charge the capacitor,
causing contact welding when the contacts are closed.
20 Series Power Relays 20/13

17. 20 Series Power Relays
Safety Precautions
Do not drop, shock or remove the relay cover to maintain the initial characteristics.
The relay cover cannot be removed from the base during normal operation.
Use the relay in environments free from dust, condensation, dioxide or hydrogen sulfide.
Make sure that the coil voltage does not exceed applicable coil voltage range.
Prevent usage of relays in the vicinity of strong magnetic field, as that my cause in malfunctioning of relays.
Failure to turn off power before wiring, installation, removal and
maintenance may cause electrical shock or fire hazard.
Attention on specifications and rated values to prevent electrical shock or fire hazard.
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.
Prevent using the check button as a switch.
The durability of the check button is a minimum of 200 operations.
It is advisable to apply a positive voltage to terminals of neighboring poles and a negative voltage to the other terminals of neighboring
poles when using DC loads on 4PDT relays to prevent the possibility of short circuits.
A soldering iron of 30 to 60W would be recommended when soldering the relay terminals and the preferred
time to complete soldering is within 4 seconds approximately.
20/14
20 Series Power Relays

18. 20 Series Power Relays
Terms And Conditions
Please read this catalog before purchasing any products. Please consult your WERNER representative for any clarifications or
comments.
Application Considerations
WERNER shall not be responsible for conformity with any regulations, codes or standards that apply to use of the products.
WERNER shall provide applicable third party certification documents identifying ratings and limitations of use that apply to the
products in case of the customer's request.
Prevent use of the products for an application involving risk to life or property. Be sure that the WERNER’s products are properly
rated and installed for the overall system or equipment.
WERNER shall not be responsible for the user's programming of a programmable products.
Warranty
WERNER's warranty represents that the products are free from defects in materials and workmanship for a period of one year.
WERNER shall not be responsible for any special loss of profit, commercial loss, indirect or consequential damages relevant
to products.
WERNER shall not be responsible for repair, warranty or any claims regarding the products unless WERNER’s Analysis
conform that the products were properly stored, installed, handled, maintained and not a the results from accident, insufficient,
abuse, misuse, natural disaster, improper installation excessive electrical supply, environmental conditions or abnormal
mechanical.
Disclaimers
WERNER shall practice to change type/model numbers when published ratings or features are changed, however some
specifications and international certifications of the products may be changed without any notice.
When in doubt, please consult with your WERNER representative to confirm actual specifications & approvals on the products.
WERNER shall change product specifications and accessories at any time based on improvements and other reasons.
The information in this catalog has been carefully checked. However, WERNER take no responsibilities for clerical, typographical or proofreading errors.
All marks and symbols use for representation in catalogues belongs to the respective owners.
Please check with WERNER representative for the available marks.
Product specifications are subject to change without notice.
E lec trIc Inventing Innovation Thank you for choosing WERNER products.
Copyright WERNER Electric. All Right Reserved.
20 Series Power Relays

19. Werner Electric India (P) Ltd.
No. 38, Hunsur Road
Mysore 570012.
T : +91 821-425 4500
F : +91 821-425 4599
E : info@in.wernerelectric.de
W: www.wernerelectric.de