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. 376-919
Mfr. Part No.RMD05024 1393146-9
$6.57
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24V dc - SPNO 475 Ω Panel Mount 30A - Quick Connect RM - - - - 38.5mm
RS Stock No. 801-8377
Mfr. Part No.2834025
$30.30
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24V dc - DPDT 636 Ω PCB Mount - - Plug In REL-IR/LDP- 24DC/2X21 AU 250V 250V - - 21.5mm
RS Stock No. 783-0338
Mfr. Part No.R10-E1W2-V700
$39.08
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24V - DPDT - - 7.5A - Plug In R10 - - - - -
RS Stock No. 422-7029
Mfr. Part No.IM03TS 1-1462037-8
$5.42
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5V dc - DPDT 178 Ω PCB Mount 2A - Through Hole IM - - - - 10mm
RS Stock No. 800-2855
Mfr. Part No.22.44.0.024.4710
BrandFinder
$147.51
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24 V ac, 24 V dc 5W DPDT - DIN Rail 40A 6kV Screw 22 Series 440V ac - - 4 53.5mm
RS Stock No. 135-4449
Mfr. Part No.V23105A5475A201
$3.152
Each (In a Tube of 25)
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5V dc 695mW DPDT 36 Ω PCB Mount 3A 1.05kV rms Through Hole - 250V ac 220V dc - - 20.2mm
RS Stock No. 686-7064
Mfr. Part No.G2R-24 5DC
BrandOmron
$10.87
Each
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5V dc - DPDT 47 Ω PCB Mount 4A - Through Hole G2R - - - - 29mm
RS Stock No. 801-8371
Mfr. Part No.2834067
$30.80
Each
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120V ac - DPDT 4.43 kΩ PCB Mount - - Plug In REL-IR/L-120AC/2X21 AU 250V 250V - - 21.5mm
RS Stock No. 800-2852
Mfr. Part No.22.44.0.024.4610
BrandFinder
$147.53
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24 V dc, 24 V ac 5W DPDT - DIN Rail 40A 6kV Screw 22 Series 440V ac - - 4 53.5mm
RS Stock No. 619-3035
Mfr. Part No.MT2-C93422
$5.58
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5V dc - DPDT 63 Ω PCB Mount 2A - Through Hole MT2 250V ac 220V dc - - 20.2mm
RS Stock No. 805-2175
Mfr. Part No.R3N-2013-23-5110-WTL
BrandRelpol
$17.37
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110V ac 1.6W 3PDT 3.45 kΩ Plug In 10A 2.5kV ac Plug In R3N 440V 24V - - 35mm
RS Stock No. 684-0043
Mfr. Part No.G7J2A2BP100120AC
BrandOmron
$57.90
Each
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120V - DPDT - PCB Mount 25A - Through Hole G7J - - - - 51.5mm
RS Stock No. 805-2172
Mfr. Part No.R3N-2013-23-5024-WTL
BrandRelpol
$17.37
Each
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24V ac 1.6W 3PDT 158 Ω Plug In 10A 2.5kV ac Plug In R3N 440V 24V - - 35mm
RS Stock No. 805-2169
Mfr. Part No.R3N-2013-23-1012-WTL
BrandRelpol
$17.37
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12V dc 900mW 3PDT 160 Ω Plug In 10A 2.5kV ac Plug In R3N 440V 24V - - 35mm
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