Non-Latching Relays

Relays are electrical switches that are operated by electrical impulses with the primary function to open and close a circuit, they can also be referred to as industrial switches. There are 2 main types available, latching and non–latching relays.


How do non-latching relays work?


Non-latching relays are in a normally closed (NC) position and will stay in this state without power. When power passes through the circuit, the relay switched to a normally open (NO) position by using an internal coil to generate a magnetic force, holding this NO position. Once the current is turned off, it returns to the NC position. This makes non-latching relays well suited to push-button applications like keyboards and micro-controller input buttons.


What are non-latching relays used for?


Non-latching relays are highly durable and versatile components, making their performance long lasting and suitable for use in a wide range of applications, such as:


  • Automotive engines

  • Household appliances

  • Industrial machinery

  • Medical equipment

  • Telecommunications equipment

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.


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 Coil Power Contact Configuration Coil Resistance Mounting Type Switching Current Isolation Coil To Contact Terminal Type Series Maximum Switching Voltage AC Maximum Switching Voltage DC Application Number of Poles Length
RS Stock No. 290-1416
Mfr. Part No.2961105
SGD26.89
Each
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24 V dc - SPDT 3.39 kΩ PCB Mount 10 mA - PCB Pin REL-MR- 24DC/21 - - Compact 1 28mm
RS Stock No. 508-0023
Mfr. Part No.2961192
SGD15.78
Each
units
24 V dc - DPDT 1.44 kΩ PCB Mount 8A - Through Hole REL-MR- 24DC/21-21 - - - - 29mm
RS Stock No. 507-9938
Mfr. Part No.2961215
SGD15.45
Each
units
24 V dc - DPDT 1.44 kΩ PCB Mount 50mA - Through Hole REL-MR- 24DC/21-21AU 30V ac 36V dc - - 12.7mm
RS Stock No. 358-8288
Mfr. Part No.2961121
SGD24.60
Each
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24 V dc - SPDT 3.39 kΩ PCB Mount 1mA - PCB Pin REL-MR- 24DC/21AU - - - - 28mm
RS Stock No. 290-1422
Mfr. Part No.2961118
SGD40.35
Each
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- - - - - - - - - - - - - -
RS Stock No. 794-3711
Mfr. Part No.2903330
SGD20.20
Each
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24 V dc 400mW DPDT 1.44 kΩ DIN Rail 50mA - Plug In RIF-1-RPT-LDP-24DC/2X21AU 30V ac 36V dc - - 16mm
RS Stock No. 507-9972
Mfr. Part No.2961312
SGD14.22
Each
units
24 V dc - SPDT 1.44 kΩ PCB Mount 16A - Through Hole REL-MR- 24DC/21HC 250V ac 250V dc - - 12.7mm
RS Stock No. 794-3759
Mfr. Part No.2903359
SGD12.75
Each
units
24 V dc 170mW SPNO 3.388 kΩ DIN Rail 50mA - Plug In RIF-0-RPT-24DC/ 1AU 30V ac 36V dc - - 6.2mm
RS Stock No. 794-3771
Mfr. Part No.2903370
SGD16.94
Each
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24 V dc 170mW SPDT 3.388 kΩ DIN Rail 6A - Plug In RIF-0-RPT-24DC/21 250V ac 250V dc - - 6.2mm
RS Stock No. 794-3780
Mfr. Part No.2903371
SGD20.39
Each
units
12 V dc 170mW SPDT 847 Ω DIN Rail 6A - Plug In RIF-0-RPT-12DC/21 250V ac 250V dc - - 6.2mm
RS Stock No. 794-3715
Mfr. Part No.2903331
SGD18.79
Each
units
230 V ac - DPDT 32.5 kΩ DIN Rail 8A - Plug In RIF-1-RPT-LV-230AC/2X21 250V ac 250V dc - - 16mm
RS Stock No. 308-1333
Mfr. Part No.2940391
SGD122.58
Each
units
24 V dc - DPDT - DIN Rail - - Screw EMG REL - - - - 75mm
RS Stock No. 794-3761
Mfr. Part No.2903361
SGD13.83
Each
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24 V dc 170mW SPNO 3.388 kΩ DIN Rail 6A - Plug In RIF-0-RPT-24DC/1 250V ac 250V dc - - 6.2mm
RS Stock No. 794-3869
Mfr. Part No.2903698
SGD14.68
Each
units
24 V dc 1.5W DPDT 430 Ω - 16A - Plug In REL-PR2- 24DC/2X21 440V ac 250V dc - - 38.6mm
RS Stock No. 794-3642
Mfr. Part No.2903279
SGD34.79
Each
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230 V ac 2.8W DPDT 7.08 kΩ DIN Rail 9A - Plug In RIF 440V ac 250V dc - - 43mm
RS Stock No. 794-3888
Mfr. Part No.2903706
SGD16.79
Each
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24 V dc 1.7W 3P-NO 345 Ω PCB Mount 16A - Plug In REL-PR3- 24DC/3X1 440V ac 250V dc - - 38.6mm
RS Stock No. 794-3632
Mfr. Part No.2903275
SGD29.72
Each
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24 V dc 1.7W 3P-NO 345 Ω DIN Rail 10A - Plug In RIF 440V ac 250V dc - - 43mm
RS Stock No. 857-1389
Mfr. Part No.2903664
SGD83.47
1 Box of 10
Box(es)
125 V dc - DPDT - Plug In - - Plug In REL-IR2/LDP-125DC/2X21 - - - - 21.2mm
RS Stock No. 508-0146
Mfr. Part No.2961545
SGD14.88
Each
units
24 V dc - SPDT 1.44 kΩ PCB Mount 50mA - Through Hole REL-MR- 24DC/21HC AU 30V ac 36V dc - - 12.7mm
RS Stock No. 794-3755
Mfr. Part No.2903342
SGD18.53
Each
units
24 V dc 400mW SPDT 1.44 kΩ DIN Rail 11A 6kV Plug In RIF-1-RPT-LDP-24DC/1X21 250V ac 250V dc - - 16mm