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 Terminal Type Series Maximum Switching Voltage AC Maximum Switching Voltage DC Application Number of Poles
RS Stock No. 135-5117
Mfr. Part No.RT424012
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Mfr. Part No.RT424012 6-1393243-3
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12 V dc - DPDT 360 Ω PCB Mount 8A - - Through Hole RT2 - - - -
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RS Stock No. 680-3849
Mfr. Part No.RT424024 6-1393243-8
$4.40
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24 V dc - DPDT 1.44 kΩ PCB Mount 8A - - Through Hole RT2 - - - -
RS Stock No. 135-5119
Mfr. Part No.RT424024 6-1393243-8
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Mfr. Part No.1393315-2
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5 V dc 200mW SPNO 125 Ω PCB Mount 3A 4kV rms - Through Hole PCJ 250V 30V - -
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36 V dc - SPNO 38 Ω Flange Mount 500A - - Screw EV200 - 900V - -
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$2.424
Each (In a Bag of 500)
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Mfr. Part No.OJE-SS-112HM,000
$3.19
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12 V dc 450mW SPNO 320 Ω PCB Mount 10A 3kV rms - Through Hole OJ/OJE 277V ac 30V dc - -
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Mfr. Part No.RT424009
$5.581
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9 V dc 400mW DPDT 200 Ω PCB Mount 8A 5kV rms - Through Hole - 400V ac - - -
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12 V dc 450mW SPNO 320 Ω PCB Mount 10A 4kV rms - - - 277V 30V - 1