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. 528-4017
Mfr. Part No.SF2D24
BrandPanasonic
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Each
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24 V dc 500mW DPDT 1.152 kΩ PCB Mount 6A 2.5kV rms Through Hole - 440V ac 30V dc - - 53.3mm
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BrandPanasonic
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12 V dc - DPDT 270 Ω PCB Mount 5A - Through Hole - - - - - 28.6mm
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Mfr. Part No.JTN1AS-PA-F-DC12V
BrandPanasonic
HK$26.56
Each (In a Box of 50)
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12 V dc 800mW SPNO 180 Ω PCB Mount 30A 2.5kV rms Through Hole - 277V - - - 26.9mm
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Mfr. Part No.JTN1AS-PA-F-DC12V
BrandPanasonic
HK$36.14
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12 V dc 800mW SPNO 180 Ω PCB Mount 30A 2.5kV rms Through Hole - 277V - - - 26.9mm
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Mfr. Part No.JW2SN12
BrandPanasonic
HK$22.18
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12 V dc - DPDT 270 Ω PCB Mount 5A - Through Hole JW - - - - 28.6mm
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BrandPanasonic
HK$36.198
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24 V dc 800mW SPNO 720 PCB Mount 30A 2.5kV rms Through Hole - 277V ac - - - 26.9mm
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Mfr. Part No.JTN1ASPAF24
BrandPanasonic
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24 V dc 800mW SPNO 720 Ω PCB Mount 30A 2.5kV rms Through Hole - 277V ac - - - 26.9mm
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BrandPanasonic
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Mfr. Part No.JW1FSN12
BrandPanasonic
HK$20.28
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Mfr. Part No.JW1FSN12
BrandPanasonic
HK$20.318
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12 V dc - SPDT 270 Ω PCB Mount 10A - Through Hole - - - - - 28.6mm
RS Stock No. 173-8957
Mfr. Part No.LKP1AF12
BrandPanasonic
HK$16.806
Each (In a Box of 100)
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12 V dc 530mW SPNO 272 PCB Mount 5A 4kV rms Through Hole - 277V ac 30V dc - - 24mm
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Mfr. Part No.LKP1AF12
BrandPanasonic
HK$21.00
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12 V dc 530mW SPNO 272 Ω PCB Mount 5A 4kV rms Through Hole - 277V ac 30V dc - - 24mm
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Mfr. Part No.TX2-5V
BrandPanasonic
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Mfr. Part No.CB1AH-P-12V
BrandPanasonic
HK$57.10
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12 V dc 1.4W SPST 103 Ω PCB Mount 70A 500V rms Through Hole - - 14V - - 26mm
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Mfr. Part No.JS1-24V-F
BrandPanasonic
HK$13.48
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24 V dc 360mW SPDT 1.6 kΩ PCB Mount 5A 1.5kV rms PCB Pin - 250V 100V - - 22mm
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Mfr. Part No.CB1AH-P-12V
BrandPanasonic
HK$56.249
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12 V dc 1.4W SPST 103 PCB Mount 70A 500V rms Through Hole - - 14V - - 26mm
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