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. 488-1869
Mfr. Part No.MY4N-D2 24DC(S)
BrandOmron
HK$156.30
Each
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24 V dc 900mW 4PDT 636 Ω Plug In 5A 2kV Plug In MY4 250V ac 30V dc - 4 28mm
RS Stock No. 365-0591
Mfr. Part No.G2RL-2 24DC
BrandOmron
HK$27.96
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24 V dc 400mW DPDT 1.44 kΩ PCB Mount 8A 5kV ac Through Hole G2RL - - - - 29mm
RS Stock No. 680-4372
Mfr. Part No.V23154D 719B110
HK$983.81
Each
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15 V dc - 4PDT 325 Ω PCB Mount 2A - PCB Pin V23154 - - - - 19mm
RS Stock No. 733-5104
Mfr. Part No.50.12.9.012.5000
BrandFinder
HK$174.92
Each
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12 V dc 700mW DPDT 205 Ω PCB Mount 8A 6kV Through Hole 50 Series 400V - - 2 29mm
RS Stock No. 680-2650
Mfr. Part No.T92S7A22-240=T92
HK$158.94
Each
units
240 V ac - DPNO 3.8 kΩ Flange Mount 30A - Quick Connect T92 - - - - 68.58mm
RS Stock No. 327-7720
Mfr. Part No.MY4IN1 DC48(S)
BrandOmron
HK$105.47
Each
units
48 V dc - 4PDT 2.56 kΩ Plug In 5A - Plug In MY4 - - - - 28mm
RS Stock No. 488-1831
Mfr. Part No.MY4IN 24DC (S)
BrandOmron
HK$104.41
Each
units
24 V dc - 4PDT 636 Ω Plug In 5A - Plug In MY4 - - - - 28mm
RS Stock No. 756-1322
Mfr. Part No.V23061A1007A302
HK$45.86
Each
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24 V dc 254mW SPNO 2.27 kΩ PCB Mount 8A 4kV rms Through Hole MSR 400V - - - 28.6mm
RS Stock No. 394-9116
BrandRS PRO
HK$64.93
Each
units
240 V ac 1.1W 4PDT 18.79 kΩ Plug In 5A 2kV ac Through Hole - 250V ac 125V dc - 4 28mm
RS Stock No. 102-456
Mfr. Part No.501290241000R
BrandFinder
HK$79.25
Each
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24 V dc 700mW DPDT 820 Ω PCB Mount 8A 6kV Through Hole 50 Series 400V ac - - 2 29mm
RS Stock No. 511-1111
Mfr. Part No.22.22.8.230.4000
BrandFinder
HK$243.27
Each
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230 V ac 3W DPNO 4.25 kΩ DIN Rail 20A 4kV Screw 22 Series 250V ac - - 2 -
RS Stock No. 351-847
Mfr. Part No.V23105A5477A201
HK$24.15
Each
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24 V dc - DPDT 1.05 kΩ PCB Mount 3A - Through Hole D2n - - - - 20.2mm
RS Stock No. 508-0023
Mfr. Part No.2961192
HK$33.84
Each
units
24 V dc - DPDT 1.44 kΩ PCB Mount 8A - Through Hole REL-MR- 24DC/21-21 - - - - 29mm
RS Stock No. 164-0204
Mfr. Part No.T92S7A22-240=T92
HK$170.067
Each (In a Bag of 30)
units
240 V ac - DPNO 3.8 kΩ Flange Mount 30A - Quick Connect - - - - - 68.58mm
RS Stock No. 350-585
Mfr. Part No.60.12.9.012.0040
BrandFinder
HK$144.95
Each
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12 V dc 1.3W DPDT 110 Ω Plug In 10A - PCB Pin 60 Series 400V ac - - - 32.5mm
RS Stock No. 376-824
Mfr. Part No.40.52.8.230.0000
BrandFinder
HK$82.55
Each
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230 V 1.2W DPDT 28 kΩ PCB Mount 8A 6kV Through Hole 40 Series 400V ac - - 2 29mm
RS Stock No. 536-871
Mfr. Part No.MKS2PI AC110
BrandOmron
HK$158.13
Each
units
110 V ac - DPDT 932 Ω Plug In 10A - Plug In MKS 250V ac 250V dc - 2 34.5mm
RS Stock No. 235-5481
Mfr. Part No.T92P7A22-240 6-1393211-2
HK$176.36
Each
units
240 V ac - DPNO 3.8 kΩ Plug In 30A - Quick Connect T92 - - - - 68.58mm
RS Stock No. 164-0214
Mfr. Part No.V23154D 719B110
HK$4,428.25
1 Tray of 5
Tray(s)
15 V dc - 4PDT 325 Ω PCB Mount 2A - PCB Pin - - - - - 19mm
RS Stock No. 385-935
Mfr. Part No.55.34.8.024.0040
BrandFinder
HK$77.56
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24 V ac 1W 4PDT 190 Ω Plug In 7A - Quick Connect 55 Series 400V ac - - 4 27.7mm
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