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. 811-3163
Mfr. Part No.JW2ASN-DC24V
BrandPanasonic
MYR10.19
Each
units
24 V dc 530mW DPNO 1.1 kΩ PCB Mount 5A 5kV rms - - - 250V 30V - -
RS Stock No. 218-2025
Mfr. Part No.G6B-2114P-US 12DC
BrandOmron
MYR23.82
Each
units
12 V dc - DPST 480 Ω PCB Mount 5A - - Through Hole G6B - - - -
RS Stock No. 366-293
Mfr. Part No.G2R-1-E 12DC
BrandOmron
MYR20.70
Each
units
12 V dc - SPDT 275 Ω PCB Mount 16A - - Through Hole G2R-1 - - - -
RS Stock No. 828-7328
Mfr. Part No.LY2N-DC24
BrandOmron
MYR61.46
Each
units
24 V dc 900mW DPDT 650 Ω Plug In 10A 2kV ac - PCB Pin LY2N 250V 125V - -
RS Stock No. 163-9321
Mfr. Part No.OJE-SS-105HM,000
MYR6.587
Each (In a Bag of 100)
units
5 V dc 450mW SPNO 55.6 Ω PCB Mount 10A 3kV rms - - - 277V 30V - 1
RS Stock No. 124-4492
Mfr. Part No.OJE-SS-105HM,000
MYR5.266
Each (In a Pack of 5)
units
5 V dc 450mW SPNO 55.6 Ω PCB Mount 10A 3kV rms - PCB Pin OJE 277V 30V - 1
RS Stock No. 127-9516
Mfr. Part No.SP2-P-DC24V
BrandPanasonic
MYR169.93
Each
units
24 V dc 300mW DPDT 1.92 kΩ PCB Mount 15 A 3kV rms - Through Hole - - - Power -
RS Stock No. 135-5120
Mfr. Part No.RT424524
MYR13.726
Each (In a Box of 500)
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24 V - DPDT 350 Ω PCB Mount 8A - - Through Hole - - - - -
RS Stock No. 690-0814
Mfr. Part No.EV200AAANA 1618002-7
MYR689.82
Each
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36 V dc - SPNO 38 Ω Flange Mount 500A - - Screw EV200 - 900V - -
RS Stock No. 135-4663
Mfr. Part No.V23105A5005A201
MYR12.248
Each (In a Tube of 25)
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24 V dc - DPDT 3.872 kΩ PCB Mount 3A - - Through Hole - - - - -
RS Stock No. 548-4251
Mfr. Part No.MY2IN 24AC (S)
BrandOmron
MYR37.40
Each
units
24 V ac 1.2W DPDT 180 Ω Plug In 10A 2kV - Plug In MY 250V ac 30V dc - 2
RS Stock No. 680-3855
Mfr. Part No.RT424524
MYR15.26
Each
units
24 V - DPDT 350 Ω PCB Mount 8A - - Through Hole RT2 - - - -
RS Stock No. 329-799
Mfr. Part No.LY2 24DC
BrandOmron
MYR75.72
Each
units
24 V dc - DPDT 650 Ω Plug In 10A - - Quick Connect LY2 - - - 2
RS Stock No. 884-1278
Mfr. Part No.RXM2AB2BD
MYR39.64
Each
units
24 V dc 900mW DPDT 650 Ω Plug In 12A - - Plug In - 250V - - 2
RS Stock No. 699-5963
Mfr. Part No.CB1M24
BrandPanasonic
MYR34.97
Each
units
24 V dc 1.8W SPDT 320 Ω Panel Mount 20A 500V rms - Quick Connect - - 28V dc - -
RS Stock No. 124-0198
Mfr. Part No.RPF2AP7
MYR61.40
Each
units
253 V ac - DPNO 15.6 kΩ DIN Rail 30A 4kV ac - Plug In - 250V 250V - 2
RS Stock No. 173-8156
Mfr. Part No.SP2-P-DC24V
BrandPanasonic
MYR130.467
Each (In a Box of 20)
units
24 V dc 300mW DPDT 1.92 k PCB Mount 15A 3kV rms - Through Hole - - - - -
RS Stock No. 745-6034
Mfr. Part No.5-1393211-4
MYR77.97
Each
units
24 V dc 1.7W DPDT 350 Ω PCB Mount 30A - - Screw T92 - - - -
RS Stock No. 548-4273
Mfr. Part No.MY2INAC220240S
BrandOmron
MYR35.84
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. 909-8006
Mfr. Part No.1-1414167-0
MYR54.13
Each
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24 V dc 2.1W SPDT 268 Ω Plug In 60A 500V rms - Plug In F4 - - - 1
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