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. 178-2012
Mfr. Part No.CB112
BrandPanasonic
$10.13
Each
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12V dc 1.4W SPDT 103 Ω Plug In 40A 500V Quick Connect CB - - - - 26mm
RS Stock No. 173-9219
Mfr. Part No.CB1AH-12V
BrandPanasonic
$10.448
Each (In a Box of 50)
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12V dc 1.8W SPST 103 Plug In 70A 500V rms Plug In - - 14V - - 26.5mm
RS Stock No. 811-3097
Mfr. Part No.CB1AH-12V
BrandPanasonic
$10.50
Each
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12V dc 1.8W SPST 103 Ω Plug In 70A 500V rms Plug In - - 14V - - 26.5mm
RS Stock No. 815-5094
Mfr. Part No.CB1-P-12V
BrandPanasonic
$9.28
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12V dc 1.4W SPDT 103 Ω PCB Mount 40A 500V rms PCB Pin - - 14V - - 26mm
RS Stock No. 173-9249
Mfr. Part No.CB1-P-12V
BrandPanasonic
$8.43
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12V dc 1.4W SPDT 103 PCB Mount 40A 500V rms PCB Pin - - 14V - - 26mm
RS Stock No. 811-3189
Mfr. Part No.JTN1AS-PA-F-DC12V
BrandPanasonic
$6.28
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12V dc 800mW SPNO 180 Ω PCB Mount 30A 2.5kV rms Through Hole - 277V - - - 26.9mm
RS Stock No. 173-9229
Mfr. Part No.JTN1AS-PA-F-DC12V
BrandPanasonic
$5.96
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units
12V dc 800mW SPNO 180 Ω PCB Mount 30A 2.5kV rms Through Hole - 277V - - - 26.9mm
RS Stock No. 173-9257
Mfr. Part No.JS1-5V-F
BrandPanasonic
$2.08
Each (In a Box of 100)
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5V dc 360mW SPDT 69.4 Ω PCB Mount 5A 1.5kV rms PCB Pin - 250V 100V - - 22mm
RS Stock No. 815-5114
Mfr. Part No.JS1-5V-F
BrandPanasonic
$2.58
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5V dc 360mW SPDT 69.4 Ω PCB Mount 5A 1.5kV rms PCB Pin - 250V 100V - - 22mm
RS Stock No. 811-3090
Mfr. Part No.CB1AH-P-12V
BrandPanasonic
$10.79
Each
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12V dc 1.4W SPST 103 Ω PCB Mount 70A 500V rms Through Hole - - 14V - - 26mm
RS Stock No. 173-9218
Mfr. Part No.CB1AH-P-12V
BrandPanasonic
$10.02
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units
12V dc 1.4W SPST 103 PCB Mount 70A 500V rms Through Hole - - 14V - - 26mm
RS Stock No. 178-1996
Mfr. Part No.CB1P12
BrandPanasonic
$14.34
Each
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12V dc 1.4W SPDT 103 Ω PCB Mount 40A 500V Through Hole CB - - - - 26mm
RS Stock No. 811-3176
Mfr. Part No.DSP1A-DC5V
BrandPanasonic
$12.59
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5V dc 300mW SPNO 83 Ω PCB Mount 5A 3kV rms - - 250V 125V - - 20.2mm
RS Stock No. 173-9227
Mfr. Part No.DSP1A-DC5V
BrandPanasonic
$10.73
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5V dc 300mW SPNO 83 PCB Mount 5A 3kV rms - - 250V 125V - - 20.2mm
RS Stock No. 423-1157
Mfr. Part No.ACT212
BrandPanasonic
$7.66
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12V dc 800mW DPDT 180 Ω PCB Mount 20A 500V rms Through Hole CP - 14V dc - - 17.4mm
RS Stock No. 382-6827
Mfr. Part No.CB124
BrandPanasonic
$11.59
Each
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24V dc 1.8W SPDT 320 Ω Plug In 20A 500V Quick Connect CB - - - - 26mm
RS Stock No. 811-3139
Mfr. Part No.DSP1-DC12V-F
BrandPanasonic
$14.21
Each
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12V dc 300mW SPDT 480 Ω PCB Mount 5A 3kV rms - - 250V 125V - - 20.2mm
RS Stock No. 173-9223
Mfr. Part No.DSP1-DC12V-F
BrandPanasonic
$11.27
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12V dc 300mW SPDT 480 Ω PCB Mount 5A 3kV rms - - 250V 125V - - 20.2mm
RS Stock No. 334-0480
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BrandPanasonic
$4.90
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12V dc 640mW SPNO 225 Ω PCB Mount 25A 500V Through Hole CP 14V ac - - 1 14mm
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Mfr. Part No.CB1-M-24V
BrandPanasonic
$8.10
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24V dc 1.8W SPDT 320 PCB Mount 40A 500V rms Quick Connect - - 14V - - 26mm