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
RS Stock No. 548-048
Mfr. Part No.G7SA-2A2B 24DC
BrandOmron
SGD43.60
Each
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BrandFinder
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- - - - - - - - - - - - - -
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Mfr. Part No.V23105A5001A201
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Each (In a Tube of 25)
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5 V dc - DPDT 168 Ω PCB Mount 3A - Through Hole - - - - - 20.2mm
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24 V dc 900mW 4PDT 650 Ω Plug In 8A - Plug In - 250V - - 4 21mm
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Mfr. Part No.MKS2PIN DC24
BrandOmron
SGD15.63
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Mfr. Part No.MY4 24DC (S)
BrandOmron
SGD13.33
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24 V dc 900mW 4PDT 636 Ω Plug In 3A 2kV Plug In MY4 250V ac 30V dc - 4 28mm
RS Stock No. 124-4458
Mfr. Part No.1-1415536-9
SGD6.16
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12 V dc 400mW SPNO 360 Ω PCB Mount 16A 5kV rms - RTH 400V - - 1 29mm
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SGD4.03
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5 V dc - DPDT 168 Ω PCB Mount 3A - Through Hole D2n - - - - 20.2mm
RS Stock No. 351-617
Mfr. Part No.40.31.7.024.0000
BrandFinder
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24 V dc 500mW SPDT 1.2 kΩ PCB Mount 10A 6kV Through Hole 40 Series 400V ac - - 1 29mm
RS Stock No. 807-4554
Mfr. Part No.G2RL-24-CF-DC24
BrandOmron
SGD6.16
Each
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24 V dc 400mW DPDT 1.44 kΩ PCB Mount 8A 5kV ac PCB Pin G2RL 440V 300V - - 29mm
RS Stock No. 842-3824
Mfr. Part No.C9-A41FX/024VDC
BrandTurck
SGD36.69
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24 V dc 1W 4PDT 594 Ω Plug In 5A 2.5kV Plug In C9-A41 250V 110V - 4 21mm
RS Stock No. 351-639
Mfr. Part No.40.61.7.012.0000
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12 V dc 500mW SPDT 300 Ω PCB Mount 16A 6kV Through Hole 40 Series 400V ac - - 1 29mm
RS Stock No. 353-887
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BrandOmron
SGD13.57
Each
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24 V dc - DPDT 1.113 kΩ Plug In 5A - Plug In G2R-2 - - - 2 29mm
RS Stock No. 870-5380
Mfr. Part No.EC2-5NU
BrandKEMET
SGD2.071
Each (In a Pack of 50)
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BrandOmron
SGD5.62
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BrandFinder
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24 V ac/dc 2.2W SP-NO/NC 41 (ac) Ω, 460 (dc) Ω DIN Rail 25A 6kV Screw 22 Series 440V - - 2 17.5mm
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