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. 508-0023
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TWD155.00
Each
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24 V dc - DPDT 1.44 kΩ PCB Mount 8A - Through Hole REL-MR- 24DC/21-21 - - - - 29mm
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Mfr. Part No.2942108
TWD1,834.00
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24 V dc - SPNO 1.14 kΩ DIN Rail - - Screw EMG 10-REL/KSR-G 24/1-LC - - - - 75mm
RS Stock No. 308-1333
Mfr. Part No.2940391
TWD1,112.00
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24 V dc - DPDT - DIN Rail - - Screw EMG REL - - - - 75mm
RS Stock No. 290-1416
Mfr. Part No.2961105
TWD200.00
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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. 857-1311
Mfr. Part No.2987998
TWD2,935.00
1 Box of 10
Box(es)
230 V ac - DPDT - Plug In - - - REL-MR-230AC/21-21AU/MS - - - - 12.7mm
RS Stock No. 794-3819
Mfr. Part No.2903676
TWD205.00
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12 V dc 36mW 4PDT 160 Ω PCB Mount 16A - Plug In REL-IR4/LDP- 12DC/4X21 250V ac 250V dc - - 21.2mm
RS Stock No. 794-3689
Mfr. Part No.2903305
TWD389.00
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120 V ac - 4PDT 3.771 kΩ DIN Rail 16A - Plug In RIF-2-RPT-LV-120AC/4X21 250V ac 250V dc - - 31mm
RS Stock No. 794-3765
Mfr. Part No.2903362
TWD216.00
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12 V dc 170mW SPNO 847 Ω DIN Rail 6A - Plug In RIF-0-RPT-12DC/ 1 250V ac 250V dc - - 6.2mm
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Mfr. Part No.2903334
TWD281.00
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24 V dc 400mW DPDT 1.44 kΩ DIN Rail 2A - Plug In RIF-1-RPT-LDP-24DC/2X21 250V ac 250V dc - - 16mm
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TWD204.00
Each
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24 V dc 77mW DPDT 640 Ω PCB Mount 30A - Plug In REL-IR2/LDP- 24DC/2X21 250V ac 250V dc - - 21.2mm
RS Stock No. 794-3702
Mfr. Part No.2903315
TWD309.00
Each
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24 V dc 77mW DPDT 640 Ω DIN Rail 2A - Plug In RIF 250V ac 250V dc - - 31mm
RS Stock No. 801-8403
Mfr. Part No.2834313
TWD401.40
Each (In a Pack of 10)
units
125 V dc - 4PDT 17.38 kΩ PCB Mount 1A - Plug In REL-IR 250V 250V - - 21.5mm
RS Stock No. 794-3752
Mfr. Part No.2903341
TWD324.00
Each
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24 V ac - SPDT 350 Ω DIN Rail 10A - Plug In RIF-1-RPT-LV-24AC/1X21 250V ac 250V dc - - 16mm
New
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Mfr. Part No.2904475
TWD156.90
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12 V dc 400mW SPNO 360 Ω PCB Mount 100mA - Through Hole REL-MR-12DC/1IC 250V 250V - - 29mm
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TWD959.00
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- - - - - - - - - - - - - -
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RS Stock No. 191-4386
Mfr. Part No.2909055
TWD479.10
Each (In a Pack of 50)
units
220 V dc 1.34W 3PDT 37 kΩ - 10mA - - REL-PR3-220DC/3X21 440V 250V - - 38.6mm
RS Stock No. 794-3856
Mfr. Part No.2903695
TWD391.00
Each
units
120 V ac - 3PDT 1.91 kΩ PCB Mount 30A - Plug In REL-OR3/L-120AC/3X21 250V ac 250V dc - - 35mm
RS Stock No. 794-3743
Mfr. Part No.2903340
TWD345.00
Each
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120 V ac - SPDT 8.8 kΩ DIN Rail 25A - Plug In RIF-1-RPT-LV-120AC/1X21 250V ac 250V dc - - 16mm
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TWD517.00
Each
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120 V ac - DPDT 1.91 kΩ DIN Rail 2A - Plug In RIF-3-RPT-LV-120AC/2X21 250V ac 250V dc - - 40mm
RS Stock No. 794-3755
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TWD297.00
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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 - - 16mm