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 Series Maximum Switching Voltage AC Maximum Switching Voltage DC Application
RS Stock No. 366-338
Mfr. Part No.G2R-2 24DC
BrandOmron
€4.03
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units
24 V dc - DPDT 1.1 kΩ PCB Mount 5A - - - Through Hole G2R-2 - - -
RS Stock No. 353-837
Mfr. Part No.G2R-1-SN 24DC(S)
BrandOmron
€7.10
Each
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24 V dc 530mW SPDT 1.1 kΩ Plug In 10A 5kV ac - - Plug In G2R-1 380V ac 125V dc -
RS Stock No. 376-442
Mfr. Part No.C9-A41X / DC 24 V
BrandReleco
€13.35
Each
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24 V dc - 4PDT 594 Ω Plug In 5A - - - PCB Pin C9 - - -
RS Stock No. 457-2846
Mfr. Part No.34.51.7.024.0010
BrandFinder
€5.58
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24 V dc 170mW SPDT 3.35 kΩ PCB Mount 6A 6kV - - PCB Pin 34 Series 400V ac - -
RS Stock No. 353-887
Mfr. Part No.G2R-2-SN 24DC(S)
BrandOmron
€8.00
Each
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24 V dc - DPDT 1.113 kΩ Plug In 5A - - - Plug In G2R-2 - - -
RS Stock No. 351-588
Mfr. Part No.40.52.7.024.0000
BrandFinder
€4.93
Each
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24 V dc 500mW DPDT 1.2 kΩ PCB Mount 8A 6kV - - Through Hole 40 Series 400V ac - -
RS Stock No. 329-7241
Mfr. Part No.G2R-2-SNI 24DC(S)
BrandOmron
€8.30
Each
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24 V dc 530mW DPDT 1.113 kΩ Plug In 5A 5kV - - PCB Pin G2R 250V ac 30V dc -
RS Stock No. 329-7229
Mfr. Part No.G2R-1-SNDI 24DC(S)
BrandOmron
€9.70
Each
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24 V dc 530mW SPDT 1.1 kΩ Plug In 10A 5kV ac - - Through Hole G2R 380V ac 125V dc -
RS Stock No. 351-617
Mfr. Part No.40.31.7.024.0000
BrandFinder
€4.18
Each
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24 V dc 500mW SPDT 1.2 kΩ PCB Mount 10A 6kV - - Through Hole 40 Series 400V ac - -
RS Stock No. 341-5146
Mfr. Part No.C10-A10X / DC 24 V
BrandReleco
€9.14
Each
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24 V dc 650mW SPDT 742 Ω Plug In 10A 5kV - - Quick Connect C10 - - -
RS Stock No. 348-762
BrandRS PRO
€9.72
Each
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230 V ac 2W DPDT 8.2 kΩ Plug In 10A 1.5kV ac - - Through Hole - 240V 30V -
RS Stock No. 121-8069
Mfr. Part No.HF92F-240A-2C21S
€16.96
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240 V ac 4W DPDT 3.8 kΩ Flange Mount 30A 4kV ac - - Quick Connect - 277V - -
RS Stock No. 353-821
Mfr. Part No.G2R-1-SN 12DC(S)
BrandOmron
€7.10
Each
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12 V dc 530mW SPDT 275 Ω Plug In 10A 5kV ac - - Plug In G2R-1 380V ac 125V dc -
RS Stock No. 351-572
Mfr. Part No.40.52.7.012.0000
BrandFinder
€5.37
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12 V dc 500mW DPDT 300 Ω PCB Mount 8A 6kV - - Through Hole 40 Series 400V ac - -
RS Stock No. 164-088
Mfr. Part No.34.51.7.005.0010
BrandFinder
€7.24
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5 V dc 170mW SPDT 130 Ω PCB Mount 6A - - - Through Hole 34 Series - - -
RS Stock No. 376-391
Mfr. Part No.C7-A20X / DC 24 V
BrandReleco
€13.29
Each
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24 V dc 1W DPDT 594 Ω Plug In 10A - - - Quick Connect C7 - 30V dc -
RS Stock No. 488-1831
Mfr. Part No.MY4IN 24DC (S)
BrandOmron
€9.10
Each
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24 V dc - 4PDT 636 Ω Plug In 5A - - - Plug In MY4 - - -
RS Stock No. 341-5168
Mfr. Part No.C10-A10BX / AD 24 V
BrandReleco
€10.10
Each
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24 V ac/dc 1.1W SPDT 290 (ac) Ω, 742 (dc) Ω Plug In 10A 5kV - - Quick Connect C10 250V ac 30V dc -
RS Stock No. 376-824
Mfr. Part No.40.52.8.230.0000
BrandFinder
€15.81
Each
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230 V 1.2W DPDT 28 kΩ PCB Mount 8A 6kV - - Through Hole 40 Series 400V ac - -
RS Stock No. 794-3761
Mfr. Part No.2903361
€6.18
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24 V dc 170mW SPNO 3.388 kΩ DIN Rail 6A - - - Plug In RIF-0-RPT-24DC/1 250V ac 250V dc -
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