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. 476-577
BrandRS PRO
£8.38
Each
Units
12V dc SPNO PCB Mount 50 A - - 440V ac - - - 39mm 15mm 30.2mm 39 x 30.2 x 15mm
RS Stock No. 476-628
BrandRS PRO
£5.86
Each
Units
24V dc SPNO PCB Mount 50 A - - 440V ac - - - 39mm 15mm 30.2mm 39 x 30.2 x 15mm
RS Stock No. 511-1098
Mfr. Part No.20.23.9.024.0000
BrandFinder
£24.38
Each
Units
24V dc DPST DIN Rail 16 A - - 250V ac - - 20 - 58.4mm 84mm -
RS Stock No. 803-304
Mfr. Part No.MY2K 24DC
BrandOmron
£22.96
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. 718-1941
Mfr. Part No.5-1462037-3
£1.83
Each
Units
3V dc DPDT PCB Mount 2 A - - 250V ac 220V dc 60 W Axicom 10mm 6mm 5.65mm 10 x 5.65 x 6mm
RS Stock No. 136-2014
Mfr. Part No.5-1462037-3
£1,395.00
1 Tube of 1000
Tube(s)
3V dc DPDT PCB Mount 2 A - - 250V ac 220V dc 60 W Axicom 10mm 6mm 5.65mm 10 x 5.65 x 6mm
RS Stock No. 240-9235
Mfr. Part No.IK8800.01 DC24V
BrandDold
£28.82
Each
Units
24V dc SPNO DIN Rail 16 A - - 230V ac - - - 89mm 58mm 17.5mm 89 x 58 x 17.5mm
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. 511-1076
Mfr. Part No.20.23.8.230.0000
BrandFinder
£24.38
Each
Units
230V ac DPST DIN Rail 16 A - - 250V ac - - 20 - 58.4mm 84mm -
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. 184-5977
Mfr. Part No.G4Q-212S 220AC
BrandOmron
£62.75
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. 159-745
Mfr. Part No.20.21.8.230.0000
BrandFinder
£20.42
Each
Units
230V SPNO DIN Rail 16 A - - - - - 20 - 58.4mm - -
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. 511-1032
Mfr. Part No.20.22.9.012.0000
BrandFinder
£24.38
Each
Units
12V dc DPST DIN Rail 16 A - - 250V ac - - 20 - 58.4mm 84mm -
RS Stock No. 515-571
Mfr. Part No.V23079-B1203-B301
£3.24
Each
Units
12V dc DPDT PCB Mount 5 A - - 250V ac 220V dc 60 W - 14.5mm 7.2mm 9.8mm 14.5 x 9.8 x 7.2mm
RS Stock No. 135-4507
Mfr. Part No.V23079-B1203-B301
£2.156
Each (In a Tube of 50)
Units
12V dc DPDT PCB Mount 5 A - - 250V ac 220V dc 60 W - 14.5mm 7.2mm 9.8mm 14.5 x 9.8 x 7.2mm
RS Stock No. 240-9257
Mfr. Part No.IK8800.11 DC24V
BrandDold
£34.87
Each
Units
24V dc SPDT DIN Rail 16 A - - 230V ac - - - 89mm 58mm 17.5mm 89 x 58 x 17.5mm
RS Stock No. 511-1054
Mfr. Part No.20.23.8.024.0000
BrandFinder
£24.38
Each
Units
24V ac DPST DIN Rail 16 A - - 250V ac - - 20 - 58.4mm 84mm -
RS Stock No. 161-4061
Mfr. Part No.V23079-B1201-B301
£2.068
Each (In a Tube of 50)
Units
5V dc DPDT PCB Mount 5 A - - 250V ac 220V dc 60 W - 14.5mm 7.2mm 9.8mm 14.5 x 9.8 x 7.2mm
RS Stock No. 515-587
Mfr. Part No.V23079-B1201-B301
£2.43
Each
Units
5V dc DPDT PCB Mount 5 A - - 250V ac 220V dc 60 W - 14.5mm 7.2mm 9.8mm 14.5 x 9.8 x 7.2mm
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