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. 815-5142
Mfr. Part No.DSP1-L2-DC12V-F
BrandPanasonic
£6.74
Each
Units
12V dc SPDT PCB Mount 5 A - - 250V 125V 150 W - 20.2mm 11mm 10.5mm 20.2 x 11 x 10.5mm
RS Stock No. 699-6011
Mfr. Part No.DK1AL212
BrandPanasonic
£9.32
Each
Units
12V dc SPST PCB Mount 10 A - - 250V ac 125V dc 300 W - 20mm 12.5mm 9.7mm 20 x 9.7 x 12.5mm
RS Stock No. 173-8937
Mfr. Part No.DK1AL212
BrandPanasonic
£9.274
Each (In a Box of 50)
Units
12V dc SPST PCB Mount 10 A - - 250V ac 125V dc 300 W - 20mm 12.5mm 9.7mm 20 x 9.7 x 12.5mm
RS Stock No. 173-9243
Mfr. Part No.DS2E-SL2-DC12V
BrandPanasonic
£4.924
Each (In a Box of 50)
Units
12V dc DPDT PCB Mount 3 A - - 250V 220V 60 W - 20mm 9.9mm 9.9mm 20 x 9.9 x 9.9mm
RS Stock No. 815-4988
Mfr. Part No.DS2E-SL2-DC12V
BrandPanasonic
£5.16
Each
Units
12V dc DPDT PCB Mount 3 A - - 250V 220V 60 W - 20mm 9.9mm 9.9mm 20 x 9.9 x 9.9mm
RS Stock No. 815-4922
Mfr. Part No.TX2-L2-12V
BrandPanasonic
£3.41
Each
Units
12V dc DPDT PCB Mount 2 A - - - 220V 60 W - 15mm 7.4mm 8.2mm 15 x 7.4 x 8.2mm
RS Stock No. 173-9239
Mfr. Part No.TX2-L2-12V
BrandPanasonic
£3.356
Each (In a Tube of 40)
Units
12V dc DPDT PCB Mount 2 A - - - 220V 60 W - 15mm 7.4mm 8.2mm 15 x 7.4 x 8.2mm
RS Stock No. 699-6238
Mfr. Part No.TQ2L3ULCSA
BrandPanasonic
£1.25
Each
Units
3V dc DPDT PCB Mount 2 A - - 125V ac 220V dc 60 W - 14mm 9mm 5mm 14 x 5 x 9mm
RS Stock No. 173-9244
Mfr. Part No.DS2E-SL2-DC24V
BrandPanasonic
£6.244
Each (In a Box of 50)
Units
24V dc DPDT PCB Mount 3 A - - 250V 220V 60 W - 20mm 9.9mm 9.9mm 20 x 9.9 x 9.9mm
RS Stock No. 815-4984
Mfr. Part No.DS2E-SL2-DC5V
BrandPanasonic
£5.30
Each
Units
5V dc DPDT PCB Mount 3 A - - 250V 220V 60 W - 20mm 9.9mm 9.9mm 20 x 9.9 x 9.9mm
RS Stock No. 815-4997
Mfr. Part No.DS2E-SL2-DC24V
BrandPanasonic
£5.36
Each
Units
24V dc DPDT PCB Mount 3 A - - 250V 220V 60 W - 20mm 9.9mm 9.9mm 20 x 9.9 x 9.9mm
RS Stock No. 699-5866
Mfr. Part No.AGN2104H
BrandPanasonic
£3.30
Each
Units
4.5V dc DPDT PCB Mount 1 A - - 125V ac 110V dc 30 W - 10.6mm 5.7mm 9mm 10.6 x 9 x 5.7mm
RS Stock No. 173-8905
Mfr. Part No.AGN2104H
BrandPanasonic
£2.168
Each (In a Tube of 50)
Units
4.5V dc DPDT PCB Mount 1 A - - 125V ac 110V dc 30 W - 10.6mm 5.7mm 9mm 10.6 x 9 x 5.7mm
RS Stock No. 173-8898
Mfr. Part No.ADJ54024
BrandPanasonic
£15.166
Each (In a Box of 100)
Units
24V dc DPDT PCB Mount 10 A - - 250V ac - - - 29mm 13mm 16.5mm 29 x 16.5 x 13mm
RS Stock No. 699-5803
Mfr. Part No.ADJ54024
BrandPanasonic
£12.17
Each
Units
24V dc DPDT PCB Mount 10 A - - 250V ac - - - 29mm 13mm 16.5mm 29 x 16.5 x 13mm
RS Stock No. 127-9320
Mfr. Part No.S4-L2-DC12V
BrandPanasonic
£12.21
Each
Units
12V dc 4PST-NO PCB Mount 3 A - - 250V ac 30V dc 90 W - 28mm 12mm 10.4mm 28 x 10.4 x 12mm
RS Stock No. 815-4868
Mfr. Part No.TQ2-L2-5V
BrandPanasonic
£3.23
Each
Units
5V dc DPDT PCB Mount - - - - - - - 14mm 9mm 5mm 14 x 9 x 5mm
RS Stock No. 173-8152
Mfr. Part No.S4-L2-DC12V
BrandPanasonic
£11.49
Each (In a Box of 50)
Units
12V dc 4PST-NO PCB Mount 3 A - - 250V ac 30V dc 90 W - 28mm 12mm 10.4mm 28 x 10.4 x 12mm
RS Stock No. 699-6345
Mfr. Part No.TX2L5C
BrandPanasonic
£1.70
Each
Units
5V dc DPDT PCB Mount 2 A - - - 220V dc 60 W - 15mm 7.4mm 8.2mm 15 x 8.2 x 7.4mm
RS Stock No. 173-8995
Mfr. Part No.TX2L5C
BrandPanasonic
£3.702
Each (In a Tube of 40)
Units
5V dc DPDT PCB Mount 2 A - - - 220V dc 60 W - 15mm 7.4mm 8.2mm 15 x 8.2 x 7.4mm