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. 515-533
Mfr. Part No.IM03DGR
TWD112.00
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5 V dc 140mW DPDT 178 Ω PCB Mount 5A - Surface Mount - - - - - 10mm
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Mfr. Part No.IM03DGR
TWD65.10
Each (On a Reel of 1000)
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5 V dc 140mW DPDT 178 Ω PCB Mount 5A - Surface Mount - - - - - 10mm
RS Stock No. 172-1629
Mfr. Part No.V23061B1007A401
TWD206.00
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24 V dc - SPDT 2.27 kΩ PCB Mount - - Through Hole MSR V23061 - - - - 30mm
RS Stock No. 135-4656
Mfr. Part No.V23061B1007A401
TWD197.30
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24 V dc - SPDT 2.27 kΩ PCB Mount - - Through Hole - - - - - 30mm
RS Stock No. 135-4472
Mfr. Part No.RP710024
TWD209.90
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24 V dc 500mW SPDT 1.1 kΩ Plug In 16A 4kV rms PCB Pin - 400V - - - 29mm
RS Stock No. 376-278
Mfr. Part No.RP710024
TWD268.00
Each
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24 V dc - SPDT 1.1 kΩ PCB Mount 16A - Through Hole - - - - - 29mm
RS Stock No. 680-3849
Mfr. Part No.RT424024 6-1393243-8
TWD104.00
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24 V dc - DPDT 1.44 kΩ PCB Mount 8A - Through Hole RT2 - - - - 29mm
RS Stock No. 135-5119
Mfr. Part No.RT424024 6-1393243-8
TWD93.40
Each (In a Box of 20)
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24 V dc - DPDT 1.44 kΩ PCB Mount 8A - Through Hole - - - - - 29mm
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Mfr. Part No.RY210024
TWD92.00
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24 V dc - SPDT 2.35 kΩ PCB Mount 8A - Through Hole RY - - - - 28.5mm
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Mfr. Part No.V23092A1012A301
TWD232.00
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Mfr. Part No.V23092A1012A301
TWD222.20
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12 V dc - SPDT 848 Ω PCB Mount 6A - Through Hole - - - - - 28mm
RS Stock No. 256-1096
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TWD196.00
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5 V dc 450mW SPDT 56 Ω PCB Mount 1A 1kV rms Through Hole W11 - - - 1 15.5mm
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Mfr. Part No.V23101D3A201
TWD163.60
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units
5 V dc 450mW SPDT 56 Ω PCB Mount 1A 1kV rms Through Hole - - - - 1 15.5mm
RS Stock No. 135-4654
Mfr. Part No.V23057B6A101
TWD511.60
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24 V dc - SPDT 1.2 kΩ PCB Mount 5A - Through Hole - - - - - 28mm
RS Stock No. 719-6252
Mfr. Part No.T92S7D12-12
TWD460.00
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12 V dc 1.7W DPST 86 Ω PCB Mount 30A 4kV rms Through Hole T92 600V ac - - - 52.32mm
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Mfr. Part No.V23057-B0006-A101 7-1393215-5
TWD576.00
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24 V dc - SPDT 1.2 kΩ PCB Mount 5A - Through Hole E - - - - 28mm
RS Stock No. 171-9323
Mfr. Part No.T9AS1D12-24 1-1393210-8
TWD115.00
Each
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24 V dc - SPNO 576 Ω PCB Mount 30A - Through Hole T9A - - - - 32.51mm
RS Stock No. 680-3830
Mfr. Part No.RT424012 6-1393243-3
TWD80.00
Each
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12 V dc - DPDT 360 Ω PCB Mount 8A - Through Hole RT2 - - - - 29mm
RS Stock No. 198-6911
Mfr. Part No.RTE24024 1-1393243-0
TWD75.00
Each
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24 V dc - DPDT 1.44 kΩ PCB Mount 8A - Through Hole RT1 - - - - 29mm
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Mfr. Part No.RT424012
TWD74.80
Each (In a Box of 20)
units
12 V dc - DPDT 360 Ω PCB Mount 8A - Through Hole - - - - - 29mm