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. 399-8360
Mfr. Part No.JSM1125
BrandPanasonic
£2.20
Each (In a Pack of 5)
Units
12V dc 640mW SPDT 225 Ω PCB Mount 15 A 1.5kV - - Through Hole - 16V dc Power -
RS Stock No. 217-2876
Mfr. Part No.JSM1125
BrandPanasonic
£2.06
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12V dc 640mW SPDT 225 Ω PCB Mount 15A 1.5kV - - Through Hole - 16V dc - 1
RS Stock No. 178-2012
Mfr. Part No.CB112
BrandPanasonic
£3.77
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12V dc 1.4W SPDT 103 Ω Plug In 40A 500V - - Quick Connect - - - -
RS Stock No. 811-3097
Mfr. Part No.CB1AH-12V
BrandPanasonic
£4.81
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12V dc 1.8W SPST 103 Ω Plug In 70A 500V rms - - Plug In - 14V - -
RS Stock No. 173-9219
Mfr. Part No.CB1AH-12V
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12V dc 1.8W SPST 103 Plug In 70A 500V rms - - Plug In - 14V - -
RS Stock No. 650-2401
Mfr. Part No.JS1-12V-F
BrandPanasonic
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12V dc 360mW SPDT 400 Ω PCB Mount 10 A 1.5kV rms - - Through Hole - - Power -
RS Stock No. 173-8927
Mfr. Part No.CM112
BrandPanasonic
£3.767
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12V dc 1.5W SPDT 96 Plug In 35A 500V rms - - Plug In - 14V dc - -
RS Stock No. 699-5967
Mfr. Part No.CM112
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£5.88
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12V dc 360mW SPDT 400 Ω PCB Mount 5A 1.5kV rms - - PCB Pin 250V 100V - -
RS Stock No. 173-8924
Mfr. Part No.CB1AH12
BrandPanasonic
£4.164
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12V dc 1.8W SPNO 80 Plug In 70A 500V rms - - Quick Connect - 14V dc - -
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Mfr. Part No.CB1AH12
BrandPanasonic
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12V dc 1.8W SPNO 80 Ω Plug In 70A 500V rms - - Quick Connect - 14V dc - -
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Mfr. Part No.JSM1-12V-5
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£1.28
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12V dc 640mW SPDT 225 Ω PCB Mount 15A 1.5kV rms - - PCB Pin - 16V - -
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12V dc 1.8W SPST 103 Ω PCB Mount 70A 500V rms - - Quick Connect - 14V - -
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£4.679
Each (In a Box of 50)
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12V dc 1.4W SPST 103 PCB Mount 70A 500V rms - - Through Hole - 14V - -
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Mfr. Part No.JS1-48V-F
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48V dc 360mW SPDT 6.4 kΩ PCB Mount 5A 1.5kV rms - - PCB Pin 250V 100V - -
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