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
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BrandPanasonic
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BrandPanasonic
SGD4.42
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12 V dc 800mW SPDT 180 Ω PCB Mount 20A 500V rms Through Hole - - 14V dc - - 17.4mm
RS Stock No. 173-8159
Mfr. Part No.DS2E-S-DC24V
BrandPanasonic
SGD6.468
Each (In a Box of 50)
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24 V dc 200mW DPDT 2.88 k PCB Mount 3A 1.5kV rms Through Hole - - - - - 20mm
RS Stock No. 127-8888
Mfr. Part No.DS2E-S-DC24V
BrandPanasonic
SGD9.12
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24 V dc 200mW DPDT 2.88 kΩ PCB Mount 3A 1.5kV rms Through Hole DS - - - - 20mm
RS Stock No. 173-8397
Mfr. Part No.JW1FSN-DC24V
BrandPanasonic
SGD3.792
Each (In a Box of 100)
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24 V dc - SPDT 1.1 kΩ PCB Mount - - Through Hole - - - - - 28.6mm
RS Stock No. 127-9279
Mfr. Part No.S45
BrandPanasonic
SGD30.01
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5 V dc 192mW 4PST-NO 130 Ω PCB Mount 38.5mA 1.5kV rms Through Hole S - - - - 28mm
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Mfr. Part No.S45
BrandPanasonic
SGD16.958
Each (In a Box of 50)
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5 V dc 192mW 4PST-NO 130 PCB Mount 38.5mA 1.5kV rms Through Hole - - - - - 28mm
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Mfr. Part No.JW1FSN-DC24V
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SGD5.366
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BrandPanasonic
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Mfr. Part No.JW1FSN-DC12V
BrandPanasonic
SGD3.843
Each (In a Box of 100)
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12 V dc - SPDT 270Ω PCB Mount - - Through Hole - - - - - 28.6mm
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Mfr. Part No.AGN20024
BrandPanasonic
SGD6.027
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24 V dc 230mW DPDT 2.504 k PCB Mount 1A 1.5kV rms Through Hole - 125V ac 110V dc - - 10.6mm
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Mfr. Part No.JW1FSN-DC12V
BrandPanasonic
SGD5.424
Each (In a Pack of 5)
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12 V dc - SPDT 270 Ω PCB Mount - - Through Hole JW - - - - 28.6mm
RS Stock No. 699-5840
Mfr. Part No.AGN20024
BrandPanasonic
SGD7.60
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24 V dc 230mW DPDT 2.504 kΩ PCB Mount 1A 1.5kV rms Through Hole - 125V ac 110V dc - - 10.6mm
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BrandPanasonic
SGD15.749
Each (In a Tube of 20)
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24 V dc 170mW SPDT 3.388 k PCB Mount 6A 4kV rms - - 250V ac - - - 28mm
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Mfr. Part No.APF30224
BrandPanasonic
SGD19.66
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24 V dc 170mW SPDT 3.388 kΩ PCB Mount 6A 4kV rms - - 250V ac - - - 28mm
RS Stock No. 173-8190
Mfr. Part No.JW2SN24
BrandPanasonic
SGD3.513
Each (In a Box of 100)
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24 V dc - DPDT 1.1 kΩ PCB Mount 5A - Through Hole - - - - - 28.6mm
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