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
Mfr. Part No.2961192
TWD155.00
Each
units
24 V dc - DPDT 1.44 kΩ PCB Mount 8A - Through Hole REL-MR- 24DC/21-21 - - - - 29mm
RS Stock No. 308-1282
Mfr. Part No.2942108
TWD1,834.00
Each
units
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
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. 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
Each
units
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
Each
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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. 794-3702
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. 794-3796
Mfr. Part No.2903660
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. 794-3721
Mfr. Part No.2903334
TWD281.00
Each
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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
RS Stock No. 794-3765
Mfr. Part No.2903362
TWD216.00
Each
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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
RS Stock No. 794-3869
Mfr. Part No.2903698
TWD318.00
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. 794-3872
Mfr. Part No.2903703
TWD376.00
Each
units
24 V ac 2.8W 3PDT 75 Ω PCB Mount 16A - Plug In REL-PR3- 24AC/3X21 440V ac 250V dc - - 38.6mm
RS Stock No. 794-3727
Mfr. Part No.2903333
TWD330.00
Each
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24 V ac - DPDT 350 Ω DIN Rail 12A - Plug In RIF-1-RPT-LV-24AC/2X21 250V ac 250V dc - - 16mm
RS Stock No. 174-3551
Mfr. Part No.1013727
TWD226.00
Each
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110 V dc - DPDT - PCB Mount 1 mA @ 12 V, 10 mA @ 12 V 2.5kV ac Through Hole - 30 V, 250 V 36 V, 250 V - 2 12.7mm
RS Stock No. 184-0961
Mfr. Part No.2987972
TWD2,638.00
1 Bag of 10
Bag(s)
230 V ac 810mW DPDT - - 10mA - - - 250V 250V - - 29mm
New
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. 508-0562
Mfr. Part No.2961299
TWD137.00
Each
units
12 V dc - DPDT 360 Ω PCB Mount 50mA - Through Hole REL-MR- 12DC/21-21AU 30V ac 36V dc - - 12.7mm
RS Stock No. 507-9938
Mfr. Part No.2961215
TWD252.00
Each
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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. 171-7054
Mfr. Part No.2908182
TWD258.00
Each
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200 V ac 0.8W DPDT - - 10mA - Plug In REL-MR-BL-200AC/21-21/MS 250V ac 250V dc - 2 13mm