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
PHP455.20
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24V dc - SPDT 3.39 kΩ PCB Mount 10 mA - PCB Pin REL-MR- 24DC/21 - - Compact 1 28mm
RS Stock No. 794-3771
Mfr. Part No.2903370
PHP558.84
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24V 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. 508-0023
Mfr. Part No.2961192
PHP286.55
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24V dc - DPDT 1.44 kΩ PCB Mount 8A - Through Hole REL-MR- 24DC/21-21 - - - - 29mm
RS Stock No. 794-3670
Mfr. Part No.2903304
PHP648.27
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230V ac - 4PDT 16.1 kΩ DIN Rail 5A - Plug In RIF-2-RPT-LV-230AC/4X21 250V ac 250V dc - - 31mm
RS Stock No. 508-0411
Mfr. Part No.2834148
PHP1,227.44
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230V ac - 4PDT 18.79 kΩ PCB Mount 12A - Through Hole REL-IR/L-230AC/4X21 AU 250V ac 250V dc - - 21.5mm
RS Stock No. 794-3715
Mfr. Part No.2903331
PHP731.62
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230V ac - DPDT 32.5 kΩ DIN Rail 8A - Plug In RIF-1-RPT-LV-230AC/2X21 250V ac 250V dc - - 16mm
RS Stock No. 794-3761
Mfr. Part No.2903361
PHP479.11
Each
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24V 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. 794-3796
Mfr. Part No.2903660
PHP406.32
Each
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24V dc 77mW DPDT 640 Ω PCB Mount 30A - Plug In REL-IR2/LDP- 24DC/2X21 250V ac 250V dc - - 21.2mm
RS Stock No. 794-3730
Mfr. Part No.2903335
PHP733.17
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230V ac - SPDT 32.5 kΩ DIN Rail 50mA - Plug In RIF 30V ac 36V dc - - 16mm
RS Stock No. 794-3787
Mfr. Part No.2903659
PHP406.32
Each
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12V dc 36mW DPDT 160 Ω PCB Mount 30A - Plug In REL-IR 250V ac 250V dc - - 21.2mm
RS Stock No. 794-3759
Mfr. Part No.2903359
PHP517.98
Each
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24V 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. 794-3642
Mfr. Part No.2903279
PHP1,364.55
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230V ac 2.8W DPDT 7.08 kΩ DIN Rail 9A - Plug In RIF 440V ac 250V dc - - 43mm
RS Stock No. 358-8288
Mfr. Part No.2961121
PHP468.05
Each
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24V dc - SPDT 3.39 kΩ PCB Mount 1mA - PCB Pin REL-MR- 24DC/21AU - - - - 28mm
RS Stock No. 507-9972
Mfr. Part No.2961312
PHP264.70
Each
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24V dc - SPDT 1.44 kΩ PCB Mount 16A - Through Hole REL-MR- 24DC/21HC 250V ac 250V dc - - 12.7mm
RS Stock No. 794-3664
Mfr. Part No.2903295
PHP944.36
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230V ac - DPDT 7.08 kΩ DIN Rail 2A - Plug In RIF-3-RPT-LV-230AC/2X21 250V ac 250V dc - - 40mm
RS Stock No. 794-3834
Mfr. Part No.2903689
PHP580.41
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24V dc 80mW DPDT 430 Ω PCB Mount 30A - Plug In REL-OR2/LDP- 24DC/2X21 250V ac 250V dc - - 35mm
RS Stock No. 794-3702
Mfr. Part No.2903315
PHP623.57
Each
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24V dc 77mW DPDT 640 Ω DIN Rail 2A - Plug In RIF 250V ac 250V dc - - 31mm
RS Stock No. 794-3673
Mfr. Part No.2903296
PHP965.93
Each
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120V ac - DPDT 1.91 kΩ DIN Rail 2A - Plug In RIF-3-RPT-LV-120AC/2X21 250V ac 250V dc - - 40mm
RS Stock No. 794-3749
Mfr. Part No.2903339
PHP702.30
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230V ac - SPDT 32.5 kΩ DIN Rail 10mA - Plug In RIF-1-RPT-LV-230AC/1X21 250V ac 250V dc - - 16mm
RS Stock No. 794-3689
Mfr. Part No.2903305
PHP776.83
Each
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120V ac - 4PDT 3.771 kΩ DIN Rail 16A - Plug In RIF-2-RPT-LV-120AC/4X21 250V ac 250V dc - - 31mm