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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BrandRS PRO
MYR47.65
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RS Stock No. 450-0302
BrandRS PRO
MYR31.43
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110V ac 1.2W DPDT 3.83 kΩ Plug In 10A 1.5kV ac PCB Pin - 240V ac 30V dc - 2 28mm
RS Stock No. 121-7796
BrandRS PRO
MYR34.77
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RS Stock No. 394-9100
BrandRS PRO
MYR31.60
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120V ac 1.1W 4PDT 4.43 kΩ Plug In 5A 2kV ac Through Hole - 250V ac 125V dc - 4 28mm
RS Stock No. 800-4514
BrandRS PRO
MYR10.34
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24V 200mW DPDT 2.88 kΩ PCB Mount 3A 1.5kV ac Through Hole - 250V ac 220V dc - 2 20.2mm
RS Stock No. 800-4445
BrandRS PRO
MYR8.98
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RS Stock No. 476-690
BrandRS PRO
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RS Stock No. 476-757
BrandRS PRO
MYR14.20
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RS Stock No. 800-4473
BrandRS PRO
MYR20.47
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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. 394-9065
BrandRS PRO
MYR28.60
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12V dc 900mW 4PDT 160 Ω Plug In 5A 2kV ac Through Hole - 250V ac 125V dc - 4 28mm
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BrandRS PRO
MYR49.23
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240V ac 300W DPDT - Plug In 10A 2.5kV ac Plug In - 250V ac 30V dc - 2 36mm
RS Stock No. 121-7834
BrandRS PRO
MYR56.71
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RS Stock No. 800-4454
BrandRS PRO
MYR9.63
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RS Stock No. 348-784
BrandRS PRO
MYR31.14
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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. 476-583
BrandRS PRO
MYR8.94
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12V dc 360mW SPDT 400 Ω PCB Mount 10A 2kV ac Through Hole - 277V ac 30V dc - 1 19mm
RS Stock No. 800-4511
BrandRS PRO
MYR9.25
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12V dc 200mW DPDT 720 Ω PCB Mount 3A 1.5kV ac Through Hole - 250V ac 220V dc - 2 20.2mm
RS Stock No. 394-9093
BrandRS PRO
MYR29.94
Each
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24V ac 1.2W 4PDT 180 Ω Plug In 5A 2kV ac Through Hole - 250V ac 125V dc - 4 28mm
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BrandRS PRO
MYR35.05
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240V ac 480W SPDT - Plug In 16A 2kV ac Plug In - 250V ac 30V dc - 1 28mm
RS Stock No. 348-813
BrandRS PRO
MYR40.97
Each
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230V ac 2.75W 3PDT 8.2 kΩ Plug In 10A 1.5kV ac Through Hole - 240V ac 30V dc - 3 35mm
RS Stock No. 450-0324
BrandRS PRO
MYR35.71
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