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. 329-963
Mfr. Part No.G7L-2A-T 24DC
BrandOmron
MYR71.73
Each
units
24 V dc - DPNO 303 Ω Panel Mount 25A - - Quick Connect G7L - - - 2
RS Stock No. 351-588
Mfr. Part No.40.52.7.024.0000
BrandFinder
MYR21.98
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24 V dc 500mW DPDT 1.2 kΩ PCB Mount 8A 6kV - Through Hole 40 Series 400V ac - - 2
RS Stock No. 488-2610
Mfr. Part No.MY2 24DC (S)
BrandOmron
MYR32.09
Each
units
24 V dc 900mW DPDT 636 Ω Plug In 10A 2kV - Plug In MY 250V ac 30V dc - 2
RS Stock No. 488-1904
Mfr. Part No.MY2 AC220/240(S)
BrandOmron
MYR36.09
Each
units
240 V ac 1.1W DPDT 18.79 kΩ Plug In 10A 2kV - Plug In MY 250V ac 30V dc - 2
RS Stock No. 351-645
Mfr. Part No.40.61.7.024.0000
BrandFinder
MYR22.36
Each
units
24 V dc 500mW SPDT 1.2 kΩ PCB Mount 16A 6kV - Through Hole 40 Series 400V ac - - 1
RS Stock No. 394-9071
Mfr. Part No.MY4 DC24
BrandOmron
MYR30.63
Each
units
24 V dc 900mW 4PDT 636 Ω Plug In 5A 2kV ac - Through Hole MY4 250V ac 125V dc - -
RS Stock No. 290-1416
Mfr. Part No.2961105
MYR34.05
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24 V dc - SPDT 3.39 kΩ PCB Mount 10 mA - - PCB Pin REL-MR- 24DC/21 - - Compact 1
RS Stock No. 488-1960
Mfr. Part No.MY2N 24DC(S)
BrandOmron
MYR41.04
Each
units
24 V dc 900mW DPDT 636 Ω Plug In 10A 2kV - Plug In MY 250V ac 30V dc - 2
RS Stock No. 794-8170
Mfr. Part No.MY2IN-D2 24DC(S)
BrandOmron
MYR58.02
Each
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24 V dc 900mW DPDT 636 Ω Plug In 10A 2kV ac - Plug In MY 250V 125V - -
RS Stock No. 173-8170
Mfr. Part No.PA1A5
BrandPanasonic
MYR27.881
Each (In a Tube of 25)
units
5 V dc 120mW SPNO 208 PCB Mount 5A 2kV rms - Through Hole - - - - -
RS Stock No. 156-5126
Mfr. Part No.PA1A5
BrandPanasonic
MYR35.75
Each
units
5 V dc 120mW SPNO 208 Ω PCB Mount 5 A 2kV rms - Through Hole - - - Power -
RS Stock No. 535-2558
Mfr. Part No.V23074A1002A403 3-1393292-8
MYR14.57
Each
units
24 V dc 1.6W SPDT 430 Ω Plug In 30A 500V - Quick Connect A - - - -
RS Stock No. 548-4267
Mfr. Part No.MY2INAC110120S
BrandOmron
MYR33.54
Each
units
120 V ac 1.1W DPDT 4.43 kΩ Plug In 10A 2kV - Plug In MY 250V ac 30V dc - 2
RS Stock No. 351-617
Mfr. Part No.40.31.7.024.0000
BrandFinder
MYR17.51
Each
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24 V dc 500mW SPDT 1.2 kΩ PCB Mount 10A 6kV - Through Hole 40 Series 400V ac - - 1
RS Stock No. 827-7053
Mfr. Part No.199X-12
MYR189.46
Each
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12 V dc 4W DPDT 70 Ω Panel Mount 40A 2.2kV ac - Screw - 600V 28V - -
RS Stock No. 828-7303
Mfr. Part No.LY2I4N DC24
BrandOmron
MYR71.89
Each
units
24 V dc 900mW DPDT 650 Ω Plug In 10A 2kV ac - PCB Pin LY2N 250V 125V - -
RS Stock No. 178-2012
Mfr. Part No.CB112
BrandPanasonic
MYR30.37
Each
units
12 V dc 1.4W SPDT 103 Ω Plug In 40A 500V - Quick Connect CB - - - -
RS Stock No. 173-9223
Mfr. Part No.DSP1-DC12V-F
BrandPanasonic
MYR42.457
Each (In a Box of 50)
units
12 V dc 300mW SPDT 480 Ω PCB Mount 5A 3kV rms - - - 250V 125V - -
RS Stock No. 508-0023
Mfr. Part No.2961192
MYR18.92
Each
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24 V dc - DPDT 1.44 kΩ PCB Mount 8A - - Through Hole REL-MR- 24DC/21-21 - - - -
RS Stock No. 811-3139
Mfr. Part No.DSP1-DC12V-F
BrandPanasonic
MYR46.98
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12 V dc 300mW SPDT 480 Ω PCB Mount 5A 3kV rms - - - 250V 125V - -
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