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. 350-383
Mfr. Part No.C3-R20 / DC 24 V
BrandReleco
£25.65
Each
Units
24V dc DPDT Plug In 10 A - - 250V ac - - C3-R20 35mm 35mm 66mm 35 x 35 x 66mm
RS Stock No. 213-0793
Mfr. Part No.C9-R21 / DC 24 V
BrandReleco
£24.80
Each
Units
24V dc DPDT Plug In 5 A - - 120V ac - - - 21mm 28mm 37.5mm 21 x 37.5 x 28mm
RS Stock No. 352-480
Mfr. Part No.C3-R20N/AC 230V
BrandReleco
£27.02
Each
Units
230V ac DPDT Plug In 10 A - - 250V ac 30V dc - - 35mm 35mm 66mm 35 x 66 x 35mm
RS Stock No. 213-0838
Mfr. Part No.C9R21N230A
BrandReleco
£27.17
Each
Units
230V ac DPDT Plug In 5 A - - 120V ac 30V dc - - 28mm 21mm 37.5mm 28 x 37.5 x 21mm
RS Stock No. 350-377
Mfr. Part No.C3-R20 / DC 12 V
BrandReleco
£27.36
Each
Units
12V dc DPDT Plug In 10 A - - 250V ac 30V dc - C3-R20 35mm 35mm 66mm 35 x 66 x 35mm
RS Stock No. 213-0800
Mfr. Part No.C9-R21 / AC 24 V
BrandReleco
£27.05
Each
Units
24V ac DPDT Plug In 5 A - - 120V ac - - - 21mm 28mm 37.5mm 21 x 37.5 x 28mm
RS Stock No. 213-0787
Mfr. Part No.C9-R21 / DC 12 V
BrandReleco
£26.07
Each
Units
12V dc DPDT Plug In 5 A - - 120V ac - - - 21mm 28mm 37.5mm 21 x 37.5 x 28mm
RS Stock No. 350-406
Mfr. Part No.C3-R20N
BrandReleco
£30.70
Each
Units
115V ac DPDT Plug In 10 A - - 250V ac 30V dc - - 35mm 35mm 66mm 35 x 66 x 35mm
RS Stock No. 213-0816
Mfr. Part No.C9-R21 / AC 115 V
BrandReleco
£29.63
Each
Units
115V ac DPDT Plug In 5 A - - 120V ac 30V dc - - 28mm 21mm 37.5mm 28 x 37.5 x 21mm