Latching Relays

A latching relay is similar in design and function to a standard general-purpose relay. However, there is one main difference with a latching relay, in that the latching relay will remain in the last position of which it was powered.



What is the difference between latching and non-latching relays?



Both types of relays in similar in design and function, however, a significant difference between them is that a latching relay will remain in the last position it when it was last powered, whereas a non-latching goes back to its normal position. This makes each more type of relay suitable for different applications.



Common Applications



Latching relays are used in a wide range of switching applications across many different types of environments and sectors. Some of the more common control circuits are telecommunication equipment, data processing equipment, alarms and security, measuring equipment and electronics designs.

Considerations when selecting a relay



When choosing a relay, it is important to consider a number of specifications to ensure it is fit for purpose, some factors include:

  • Coil voltage - the required voltage to actuate the switching mechanism. If a voltage is too high this could damage the components, if it is too low then it will not actuate


  • Contact configuration - This is the state the contacts are in without power. For example SPST, single pole single throw


  • Contact material - the relay contacts are available in many materials that have certain properties. Common materials are gold, silver, tin oxide and nickel


  • Coil power - the amount of power (watts) the coil operates at. This must match the power in the circuit for correct function


  • Coil resistance - the amount of resistance (ohms) in the circuit that the coil creates


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Description Price Coil Voltage Contact Configuration Mounting Type Switching Current Maximum Switching Current AC Maximum Switching Current DC Maximum Switching Voltage AC Maximum Switching Voltage DC Maximum Switching Power DC Series Length Depth Height Dimensions
RS Stock No. 803-304
Mfr. Part No.MY2K 24DC
BrandOmron
£23.27
Each
Units
24V dc DPDT Plug In 3 A - - 250V ac 125V dc 72 W - 28mm 21.5mm 36mm 28 x 36 x 21.5mm
RS Stock No. 184-5977
Mfr. Part No.G4Q-212S 220AC
BrandOmron
£63.54
Each
Units
220V ac DPDT Plug In 5 A - - 250V ac 250V dc 120 W - 92.5mm 63.5mm 80mm 92.5 x 63.5 x 80mm
RS Stock No. 210-6633
Mfr. Part No.G4Q-212S, 12 VDC
BrandOmron
£63.54
Each
Units
12V dc DPDT Plug In 5 A - - 250V ac 250V dc 120 W - 92.5mm 63.5mm 80mm 92.5 x 63.5 x 80mm
RS Stock No. 683-8766
Mfr. Part No.G2RK-2 12DC
BrandOmron
£7.37
Each
Units
12V dc DPDT PCB Mount 5 A - - 380V ac 125V dc 90 W - 29mm 13mm 25.5mm 29 x 25.5 x 13mm
RS Stock No. 683-8741
Mfr. Part No.G2RK-1 24DC
BrandOmron
£5.10
Each
Units
24V dc SPDT PCB Mount 5 A - - 380V ac 125V dc 150 W - 29mm 13mm 25.5mm 29 x 25.5 x 13mm
RS Stock No. 184-5949
Mfr. Part No.G4Q-212S, 24VDC
BrandOmron
£63.54
Each
Units
24V dc DPDT Plug In 5 A - - 250V ac 250V dc 120 W - 92.5mm 63.5mm 80mm 92.5 x 63.5 x 80mm
RS Stock No. 184-8386
Mfr. Part No.G4Q-212S 110AC
BrandOmron
£63.54
Each
Units
110V ac DPDT Plug In 5 A - - 250V ac 250V dc 120 W - 92.5mm 63.5mm 80mm 92.5 x 63.5 x 80mm
RS Stock No. 827-6283
Mfr. Part No.G5RLU1AEDC3
BrandOmron
£2.81
Each
Units
3V dc SPNO PCB Mount 16 A - - 250V 24V - - 29mm 12.7mm 15.7mm 29 x 12.7 x 15.7mm
RS Stock No. 683-8769
Mfr. Part No.G2RK-2 24DC
BrandOmron
£7.37
Each
Units
24V dc DPDT PCB Mount 3 A - - 380V ac 125V dc 90 W - 29mm 13mm 25.5mm 29 x 25.5 x 13mm
RS Stock No. 808-393
Mfr. Part No.G6BK-1114P-US 24DC
BrandOmron
£6.18
Each
Units
24V dc SPNO PCB Mount 5 A - - 380V ac 125V dc 150 W - 21mm 10mm 10mm 21 x 10 x 10mm
RS Stock No. 808-371
Mfr. Part No.G6BK-1114P-US 5DC
BrandOmron
£7.15
Each
Units
5V dc SPNO PCB Mount 5 A - - 380V ac 125V dc 150 W - 20mm 10mm 10mm 20 x 10 x 10mm
RS Stock No. 683-9756
Mfr. Part No.G6KU2PY12DC
BrandOmron
£3.49
Each
Units
12V dc DPDT PCB Mount 1 A - - 125V ac 60V dc 30 W - 10mm 6.5mm 5mm 10 x 5 x 6.5mm
RS Stock No. 184-5955
Mfr. Part No.G4Q-212S 24AC
BrandOmron
£63.54
Each
Units
24V ac DPDT Plug In 5 A - - 250V ac 250V dc 120 W - 92.5mm 63.5mm 80mm 92.5 x 63.5 x 80mm
RS Stock No. 683-8747
Mfr. Part No.G2RK-1 12DC
BrandOmron
£6.22
Each
Units
12V dc SPDT PCB Mount 5 A - - 380V ac 125V dc 150 W - 29mm 13mm 25.5mm 29 x 25.5 x 13mm
RS Stock No. 684-0378
Mfr. Part No.G6AU274P12DC
BrandOmron
£4.12
Each
Units
12V dc DPDT PCB Mount 2 A - - 250V ac 220V dc 60 W - 20.2mm 10.1mm 8.4mm 20.2 x 8.4 x 10.1mm
RS Stock No. 808-387
Mfr. Part No.G6BK-1114P-US 12DC
BrandOmron
£6.45
Each
Units
12V dc SPNO PCB Mount 5 A - - 380V ac 125V dc 150 W - 21mm 10mm 10mm 21 x 10 x 10mm
RS Stock No. 827-6315
Mfr. Part No.G5RLK1AEDC5
BrandOmron
£3.37
Each
Units
5V dc SPNO PCB Mount 16 A - - 250V 24V - - 29mm 12.7mm 15.7mm 29 x 12.7 x 15.7mm
RS Stock No. 683-9472
Mfr. Part No.G6EU-134P-US 24DC
BrandOmron
£4.02
Each
Units
24V dc SPDT PCB Mount 3 A - - 250V ac 220V dc 60 W - 16mm 10mm 8mm 16 x 8 x 10mm
RS Stock No. 683-9425
Mfr. Part No.G6CU2114PUS5DC
BrandOmron
£7.65
Each
Units
5V dc SPDT PCB Mount 8 A - - 250V ac 125V dc 240 W - 20mm 15mm 10mm 20 x 10 x 15mm
RS Stock No. 683-9885
Mfr. Part No.G6SK-2F 5DC
BrandOmron
£3.86
Each
Units
5V dc DPDT Surface Mount 2 A - - 250V ac 220V dc 60 W - 14.8mm 9.2mm 9.2mm 14.8 x 9.2 x 9.2mm