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 Maximum Switching Voltage AC Maximum Switching Voltage DC Application Number of Poles
RS Stock No. 680-3849
Mfr. Part No.RT424024 6-1393243-8
£2.36
Each
Units
24V dc - DPDT 1.44 kΩ PCB Mount 8A - - - Through Hole - - - -
RS Stock No. 135-5119
Mfr. Part No.RT424024 6-1393243-8
£2.142
Each (In a Box of 20)
Units
24V dc - DPDT 1.44 kΩ PCB Mount 8A - - - Through Hole - - - -
RS Stock No. 308-0598
Mfr. Part No.V23134A1052C643 5-1393302-8
£12.08
Each
Units
12V dc 1.6W SPDT 90 Ω Plug In 40A 500V - - Quick Connect 100V ac - - 1
RS Stock No. 680-3830
Mfr. Part No.RT424012 6-1393243-3
£1.79
Each
Units
12V dc - DPDT 360 Ω PCB Mount 8A - - - Through Hole - - - -
RS Stock No. 135-5117
Mfr. Part No.RT424012
£1.625
Each (In a Box of 20)
Units
12V dc - DPDT 360 Ω PCB Mount 8A - - - Through Hole - - - -
RS Stock No. 334-0020
Mfr. Part No.PT570024 1-1393154-2
£6.03
Each
Units
24V dc - 4PDT 777 Ω Plug In 6A - - - Quick Connect - - - -
RS Stock No. 359-6302
Mfr. Part No.V23134A1053C643 6-1393302-3
£14.10
Each
Units
24V dc 1.6W SPDT 332 Ω Plug In 40A 500V - - Quick Connect 100V ac - - 1
RS Stock No. 308-0611
Mfr. Part No.V23134B1052C642 3-1393303-4
£10.30
Each
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12V dc 1.6W SPNO 91 Ω Plug In 40A 500V - - Quick Connect 100V ac - - 1
RS Stock No. 135-4666
Mfr. Part No.RTE24024
£2.238
Each (In a Box of 20)
Units
24V dc - DPDT 1.44 kΩ PCB Mount 8A - - - Through Hole - - - -
RS Stock No. 198-6911
Mfr. Part No.RTE24024 1-1393243-0
£2.47
Each
Units
24V dc - DPDT 1.44 kΩ PCB Mount 8A - - - Through Hole - - - -
RS Stock No. 909-7955
Mfr. Part No.1393315-2
£33.14
Each
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12V dc 3.9W SPNO 37 Ω Flange Mount 300A - - - Screw - - - 1
RS Stock No. 136-1618
Mfr. Part No.1393315-2
£1,533.54
1 Box of 50
Box(es)
12V dc 3.9W SPNO 37 Ω Flange Mount 300A - - - Screw - - - 1
RS Stock No. 422-7029
Mfr. Part No.IM03TS 1-1462037-8
£2.41
Each
Units
5V dc - DPDT 178 Ω PCB Mount 2A - - - Through Hole - - - -
RS Stock No. 135-5007
Mfr. Part No.IM03TS
£0.991
Each (In a Tube of 1000)
Units
5V dc - DPDT 178 Ω PCB Mount 2A - - - Through Hole - - - -
RS Stock No. 256-5155
Mfr. Part No.MT321024 7-1393091-0
£8.45
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24V dc 1.2W 3PDT 475 Ω Plug In 10A 2.5kV rms - - Plug In - - - -
RS Stock No. 782-6941
Mfr. Part No.1432794-1
£2.70
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12V dc - SPDT - Panel Mount - - - - - - 14V dc - -
RS Stock No. 164-0155
Mfr. Part No.PCJ-112D3M-WG,000M
£1.002
Each (In a Bag of 75)
Units
12V dc 200mW SPNO 720 Ω PCB Mount 5A 4kV rms - - Through Hole 400V 30V - -
RS Stock No. 680-2669
Mfr. Part No.PCJ-112D3M-WG,000M
£1.81
Each
Units
12V dc 200mW SPNO 720 Ω PCB Mount 5A 4kV rms - - Through Hole 400V 30V - -
RS Stock No. 189-4109
Mfr. Part No.RT314024 9-1393239-8
£2.27
Each
Units
24V dc - SPDT 1.44 kΩ PCB Mount 16A - - - Through Hole - - - -
RS Stock No. 135-4660
Mfr. Part No.RT314024 9-1393239-8
£2.063
Each (In a Box of 20)
Units
24V dc - SPDT 1.44 kΩ PCB Mount 16A - - - Through Hole - - - -