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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รายละเอียดสินค้า / Description ราคา / 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. 800-4498
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THB87.44
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24V 530mW DPDT 1.1 kΩ PCB Mount 10A 5kV ac Through Hole - 250V ac 30V dc - 2 29mm
RS Stock No. 888-6802
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THB348.274
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24V dc - SPDT - DIN Rail 6A - Screw - 250V 250V - 1 6.2mm
RS Stock No. 800-4524
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THB85.61
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RS Stock No. 476-763
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THB169.75
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24V dc 250mW SPDT 2.304 kΩ PCB Mount 10A 5kV ac Through Hole - 440V ac 300V dc - 1 29mm
RS Stock No. 476-719
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THB164.81
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24V dc 400mW SPDT 1.44 kΩ PCB Mount 12A 5kV ac Through Hole - 440V ac 300V dc - 1 29mm
RS Stock No. 348-784
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THB319.23
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24V dc 1.2W DPDT 478 Ω Plug In 10A 1.5kV ac Through Hole - 240V 30V - 2 35mm
RS Stock No. 193-5847
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THB1,448.47
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7.5V 280mW 4PDT 89 Ω PCB Mount 2A - PCB Pin - 250V 220V - 4 20.32mm
RS Stock No. 193-5865
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THB1,854.54
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36V 400mW 4PDT 144 Ω PCB Mount 2A - PCB Pin - 250V 220V - 4 35.56mm
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THB360.816
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24V ac/dc - SPDT - DIN Rail 6A - Screw - 250V 250V - 1 6.2mm
RS Stock No. 800-4505
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THB86.76
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12V dc 530mW SPDT 275 Ω PCB Mount 20A 4kV ac Through Hole - 277V ac 30V dc - 1 29mm
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THB271.13
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240V ac 1.2W DPDT 15.7 kΩ Plug In 10A 1.5kV ac PCB Pin - 240V ac 30V dc - 2 28mm
RS Stock No. 121-7828
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THB406.46
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12V dc 300W DPDT - Plug In 10A 2.5kV ac Plug In - 250V ac 30V dc - 2 36mm
RS Stock No. 476-680
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THB95.22
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24V dc 150mW SPDT 3.84 kΩ PCB Mount 2A 1kV ac Through Hole - 125V ac 60V dc - 1 12.5mm
RS Stock No. 888-6818
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THB366.474
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24V ac/dc - SPDT - DIN Rail 6A - Screw - 250V 250V - 1 6.2mm
RS Stock No. 121-7822
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THB485.91
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24V ac 300W 4PDT - Plug In 10A 2kV ac Plug In - 250V ac 30V dc - 4 41.5mm
RS Stock No. 800-4473
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THB182.20
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230V ac 750mW SPDT 32.5 kΩ PCB Mount 16A 5kV ac Through Hole - 440V ac 300V dc - 1 29mm
RS Stock No. 888-6815
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THB366.474
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24V ac/dc - SPDT - DIN Rail 6A - Screw - 250V 250V - 1 6.2mm
RS Stock No. 193-5863
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THB1,854.54
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18V 280mW 4PDT 514 Ω PCB Mount 2A - PCB Pin - 250V 220V - 4 35.56mm
RS Stock No. 193-5860
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THB1,854.54
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7.5V 280mW 4PDT 89 Ω PCB Mount 2A - PCB Pin - 250V 220V - 4 35.56mm
RS Stock No. 450-0217
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THB215.02
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110V ac 1.2W SPDT 3.83 kΩ PCB Mount 15A 1.5kV ac PCB Pin - 240V ac 28V dc - 1 27mm
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