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
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BrandRelpol
TWD117.00
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Mfr. Part No.RM85-2011-35-5110
BrandRelpol
TWD244.00
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110 V ac 750mW SPDT 8.9 kΩ PCB Mount 16A 5kV ac Plug In RM85 440V 24V - 1 29mm
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Mfr. Part No.RM32N-3021-85-1012
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TWD117.00
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12 V dc 450mW SPNO 320 Ω PCB Mount 5A 2.5kV ac PCB Pin - 277V 28V - 1 18.8mm
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Mfr. Part No.R2N-2012-23-1012-WTL
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TWD254.00
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12 V dc 900mW DPDT 160 Ω Plug In 12A 2.5kV ac Plug In R2N 440V 24V - - 21.2mm
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Mfr. Part No.R2N-2012-23-5230-WTL
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TWD276.00
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230 V ac 1.6W DPDT 16.1 kΩ Plug In 12A 2.5kV ac Plug In R2N 440V 24V - - 21.2mm
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Mfr. Part No.R2N-2012-23-1024-WTL
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TWD254.00
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RS Stock No. 134-8380
Mfr. Part No.RM85-2011-35-1005
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TWD201.00
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5 V dc 400 → 480mW - 60 Ω PCB Mount 16A 5kV ac PCB Pin - 440V 24V - 1 29mm
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TWD99.00
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230 V ac 750mW SPDT 38.5 kΩ PCB Mount 16A 5kV ac Plug In RM85 440V 24V - 1 29mm
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12 V dc 360mW SPDT 400 Ω PCB Mount 15A 1kV ac PCB Pin - 240/277V ac 48V dc - 1 19mm
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230 V ac 750mW DPDT 38.5 kΩ PCB Mount 8A 5kV ac Plug In RM84 440V 24V - 2 29mm
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Mfr. Part No.RM85-2011-35-1024
BrandRelpol
TWD191.00
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24 V dc 480mW SPDT 1.44 kΩ PCB Mount 16A 5kV ac Plug In RM85 440V 24V - 1 29mm
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Mfr. Part No.RM85-2011-35-1110
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Mfr. Part No.R15-2013-23-1024-WTL
BrandRelpol
TWD408.00
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