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 Terminal Type Series Maximum Switching Voltage AC Maximum Switching Voltage DC Application Number of Poles
RS Stock No. 399-8411
Mfr. Part No.JW2SN-DC24V
BrandPanasonic
$7.476
Each (In a Pack of 5)
units
24 V dc - DPDT 1.1 kΩ PCB Mount - - - Through Hole JW - - - -
RS Stock No. 154-605
Mfr. Part No.56.32.9.012.0040
BrandFinder
$31.85
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12 V dc 1.5W DPDT 140 Ω Plug In 12A - - Quick Connect 56 Series 400V ac - - 2
RS Stock No. 811-3090
Mfr. Part No.CB1AH-P-12V
BrandPanasonic
$9.94
Each
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12 V dc 1.4W SPST 103 Ω PCB Mount 70A 500V rms - Through Hole - - 14V - -
RS Stock No. 351-572
Mfr. Part No.40.52.7.012.0000
BrandFinder
$10.32
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12 V dc 500mW DPDT 300 Ω PCB Mount 8A 6kV - Through Hole 40 Series 400V ac - - 2
RS Stock No. 683-9356
Mfr. Part No.G6B2114PUS5DC
BrandOmron
$12.71
Each
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5 V dc - DPST 83.3 Ω PCB Mount 5A - - Through Hole G6B - - - -
RS Stock No. 124-0204
Mfr. Part No.RSL1GB4JD
$18.39
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12 V dc - SPDT 848 Ω PCB Mount 6A 4kV ac - Plug In - - 277V - 1
RS Stock No. 173-8400
Mfr. Part No.JW2SN-DC24V
BrandPanasonic
$4.383
Each (In a Box of 100)
units
24 V dc - DPDT 1.1 kΩ PCB Mount - - - Through Hole - - - - -
RS Stock No. 245-2065
Mfr. Part No.65.31.9.024.0300
BrandFinder
$32.57
Each
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24 V dc 1.3W SPNO 445 Ω Flange Mount 30A 4kV - Quick Connect 65 Series 250V ac - - 1
RS Stock No. 680-2600
Mfr. Part No.T92P7D12-24
$23.94
Each
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24 V dc - DPNO 350 Ω PCB Mount 30A - - Through Hole T92 - - - -
RS Stock No. 173-9218
Mfr. Part No.CB1AH-P-12V
BrandPanasonic
$12.075
Each (In a Box of 50)
units
12 V dc 1.4W SPST 103 PCB Mount 70A 500V rms - Through Hole - - 14V - -
RS Stock No. 808-8465
Mfr. Part No.G5LE-1-DC5
BrandOmron
$3.87
Each
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5 V dc 400mW SPDT 63 Ω PCB Mount 8A 2kV ac - PCB Pin G5LE 250V 125V - -
RS Stock No. 245-2093
Mfr. Part No.65.31.9.012.0000
BrandFinder
$27.32
Each
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12 V dc 1.3W SPDT 110 Ω Flange Mount 20A 4kV - Quick Connect 65 Series 250V ac - - 1
RS Stock No. 165-0718
Mfr. Part No.T92P7D12-24
$20.723
Each (In a Bag of 30)
units
24 V dc - DPNO 350 Ω PCB Mount 30A - - Through Hole - - - - -
RS Stock No. 290-1422
Mfr. Part No.2961118
$15.21
Each
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- - - - - - - - - - - - - -
RS Stock No. 680-3849
Mfr. Part No.RT424024 6-1393243-8
$4.84
Each
units
24 V dc - DPDT 1.44 kΩ PCB Mount 8A - - Through Hole RT2 - - - -
RS Stock No. 699-5730
Mfr. Part No.ACTP112
BrandPanasonic
$4.50
Each
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12 V dc 1W SPDT 144 Ω PCB Mount 30A 500V rms - Through Hole - - 14V dc - -
RS Stock No. 488-2597
Mfr. Part No.MY2 24AC (S)
BrandOmron
$14.18
Each
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24 V ac 1.2W DPDT 180 Ω Plug In 10A 2kV - Plug In MY 250V ac 30V dc - 2
RS Stock No. 814-8462
Mfr. Part No.92S7D22D-12
$11.23
Each
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12 V dc 4W DPNO 86 Ω Panel Mount 20A 4kV ac - Quick Connect - 300V - - -
RS Stock No. 189-3156
Mfr. Part No.55.32.9.012.0040
BrandFinder
$13.02
Each
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12 V dc 1W DPDT 140 Ω Plug In 20A 4kV - Quick Connect 55 Series 400V ac - - 2
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Mfr. Part No.45.71.7.024.0310
BrandFinder
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24 V dc 650mW SPNO 1.6 kΩ PCB Mount 16A 4kV - Through Hole 45 Series 250V ac - - 1
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