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 Maximum Switching Current DC Terminal Type Maximum Switching Voltage AC Maximum Switching Voltage DC Application Number of Poles
RS Stock No. 476-775
BrandRS PRO
£3.27
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24V dc 290mW SPDT 2.35 kΩ PCB Mount 10A 5kV ac - - Through Hole 440V ac 125V dc - 1
RS Stock No. 450-0352
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£5.60
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24V dc 900mW DPDT 650 Ω Plug In 10A 1.5kV ac - - PCB Pin 240V ac 30V dc - 2
RS Stock No. 450-0295
BrandRS PRO
£5.97
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24V dc 900mW SPDT 750 Ω PCB Mount 15A 1.5kV ac - - PCB Pin 240V ac 28V dc - 1
RS Stock No. 394-9065
BrandRS PRO
£5.35
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12V dc 900mW 4PDT 160 Ω Plug In 5A 2kV ac - - Through Hole 250V ac 125V dc - 4
RS Stock No. 121-7811
BrandRS PRO
£5.96
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24V dc 300W DPDT - Plug In 10A 2kV ac - - Plug In 250V ac 30V dc - 2
RS Stock No. 121-7795
BrandRS PRO
£6.49
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12V dc 150W 4PDT - Plug In 5A 2kV ac - - Plug In 250V ac 30V dc - 4
RS Stock No. 476-630
BrandRS PRO
£3.71
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24V dc 170mW SPDT 3.39 kΩ PCB Mount 6A 4kV ac - - Through Hole 400V ac 125V dc - 1
RS Stock No. 450-0251
BrandRS PRO
£4.70
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24V dc 900mW SPDT 750 Ω PCB Mount 15A 1.5kV ac - - PCB Pin 240V ac 28V dc - 1
RS Stock No. 121-7806
BrandRS PRO
£5.96
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24V dc 480W SPDT - Plug In 16A 2kV ac - - Plug In 250V ac 30V dc - 1
RS Stock No. 450-0346
BrandRS PRO
£5.60
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24V ac 1.2W DPDT 180 Ω Plug In 10A 1.5kV ac - - PCB Pin 240V ac 30V dc - 2
RS Stock No. 450-0330
BrandRS PRO
£5.60
Each
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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
RS Stock No. 394-9100
BrandRS PRO
£5.35
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120V ac 1.1W 4PDT 4.43 kΩ Plug In 5A 2kV ac - - Through Hole 250V ac 125V dc - 4
RS Stock No. 800-4489
BrandRS PRO
£1.88
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12V dc 530mW DPDT 275 Ω PCB Mount 10A 5kV ac - - Through Hole 250V ac 30V dc - 2
RS Stock No. 121-7796
BrandRS PRO
£5.77
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24V dc 150W 4PDT - Plug In 5A 2kV ac - - Plug In 250V ac 30V dc - 4
RS Stock No. 476-618
BrandRS PRO
£1.60
Each
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24V dc 360mW SPDT 1.6 kΩ PCB Mount 10A 2kV ac - - Through Hole 277V ac 30V dc - 1
RS Stock No. 121-7813
BrandRS PRO
£6.27
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110V ac 300W DPDT - Plug In 10A 2kV ac - - Plug In 250V ac 30V dc - 2
RS Stock No. 394-9093
BrandRS PRO
£5.35
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RS Stock No. 450-0318
BrandRS PRO
£5.60
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12V dc 900mW DPDT 160 Ω Plug In 10A 1.5kV ac - - PCB Pin 240V ac 30V dc - 2
RS Stock No. 121-7828
BrandRS PRO
£8.88
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12V dc 300W DPDT - Plug In 10A 2.5kV ac - - Plug In 250V ac 30V dc - 2
RS Stock No. 800-4448
BrandRS PRO
£1.79
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12V dc 400mW SPDT 360 Ω PCB Mount 16A 5kV ac - - Through Hole 440V ac 300V dc - 1
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