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 Maximum Switching Current AC Maximum Switching Current DC Terminal Type Series Maximum Switching Voltage AC Maximum Switching Voltage DC Application
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Mfr. Part No.2961105
R 108.40
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24 V dc - SPDT 3.39 kΩ PCB Mount 10 mA - - - PCB Pin REL-MR- 24DC/21 - - Compact
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R 52.41
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24 V dc - DPDT 1.44 kΩ PCB Mount 8A - - - Through Hole REL-MR- 24DC/21-21 - - -
RS stock no. 794-3787
Mfr. Part No.2903659
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12 V dc 36mW DPDT 160 Ω PCB Mount 30A - - - Plug In REL-IR 250V ac 250V dc -
RS stock no. 794-3878
Mfr. Part No.2903702
R 162.06
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24 V dc 1.5W 3PDT 430 Ω PCB Mount 16A - - - Plug In REL-PR3- 24DC/3X21 440V ac 250V dc -
RS stock no. 794-3761
Mfr. Part No.2903361
R 112.82
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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 -
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Mfr. Part No.2961257
R 44.70
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12 V dc - DPDT 360 Ω PCB Mount 8A - - - Through Hole REL-MR- 12DC/21-21 250V ac 250V dc -
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R 177.58
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- - - - - - - - - - - - - -
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Mfr. Part No.2903370
R 131.68
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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 -
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Mfr. Part No.2942153
R 513.63
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R 468.72
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Mfr. Part No.2903371
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12 V dc 170mW SPDT 847 Ω DIN Rail 6A - - - Plug In RIF-0-RPT-12DC/21 250V ac 250V dc -
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24 V dc 1.5W 3PDT 430 Ω DIN Rail 10A - - - Plug In RIF 440V ac 250V dc -
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Mfr. Part No.2903669
R 133.64
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12 V dc 36mW 4PDT 160 Ω PCB Mount 50mA - - - Plug In REL-IR4/LDP- 12DC/4X21AU 30V ac 36V dc -
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Mfr. Part No.2903683
R 119.96
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24 V ac - 4PDT 158 Ω PCB Mount 50mA - - - Plug In REL-IR4/L- 24AC/4X21AU 30V ac 36V dc -
RS stock no. 794-3884
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R 194.15
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230 V ac 2.8W 3PDT 7.08 kΩ PCB Mount 16A - - - Plug In REL-PR 440V ac 250V dc -
RS stock no. 794-3759
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24 V dc 170mW SPNO 3.388 kΩ DIN Rail 50mA - - - Plug In RIF-0-RPT-24DC/ 1AU 30V ac 36V dc -
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R 367.79
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230 V ac 2.8W 3PDT 7.08 kΩ DIN Rail 8A - - - Plug In RIF 440V ac 250V dc -
RS stock no. 794-3642
Mfr. Part No.2903279
R 358.71
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230 V ac 2.8W DPDT 7.08 kΩ DIN Rail 9A - - - Plug In RIF 440V ac 250V dc -
RS stock no. 794-3755
Mfr. Part No.2903342
R 146.80
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24 V dc 400mW SPDT 1.44 kΩ DIN Rail 11A 6kV - - Plug In RIF-1-RPT-LDP-24DC/1X21 250V ac 250V dc -
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24 V dc - SPDT 3.39 kΩ PCB Mount 1mA - - - PCB Pin REL-MR- 24DC/21AU - - -