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. 173-8170
Mfr. Part No.PA1A5
BrandPanasonic
MYR27.881
Each (In a Tube of 25)
units
5 V dc 120mW SPNO 208 PCB Mount 5A 2kV rms - Through Hole - - - - -
RS Stock No. 156-5126
Mfr. Part No.PA1A5
BrandPanasonic
MYR35.75
Each
units
5 V dc 120mW SPNO 208 Ω PCB Mount 5 A 2kV rms - Through Hole - - - Power -
RS Stock No. 178-2012
Mfr. Part No.CB112
BrandPanasonic
MYR30.37
Each
units
12 V dc 1.4W SPDT 103 Ω Plug In 40A 500V - Quick Connect CB - - - -
RS Stock No. 173-9223
Mfr. Part No.DSP1-DC12V-F
BrandPanasonic
MYR42.457
Each (In a Box of 50)
units
12 V dc 300mW SPDT 480 Ω PCB Mount 5A 3kV rms - - - 250V 125V - -
RS Stock No. 811-3139
Mfr. Part No.DSP1-DC12V-F
BrandPanasonic
MYR46.98
Each
units
12 V dc 300mW SPDT 480 Ω PCB Mount 5A 3kV rms - - - 250V 125V - -
RS Stock No. 178-1918
Mfr. Part No.TX25
BrandPanasonic
MYR21.35
Each
units
5 V dc 140mW DPDT 178 Ω PCB Mount 2 A 2kV rms - Through Hole - - - General Purpose -
RS Stock No. 173-8174
Mfr. Part No.TX25
BrandPanasonic
MYR26.814
Each (In a Tube of 40)
units
5 V dc 140mW DPDT 178 PCB Mount 2A 2kV rms - Through Hole - - - - -
RS Stock No. 815-5117
Mfr. Part No.JS1-12V-F
BrandPanasonic
MYR7.80
Each
units
12 V dc 360mW SPDT 400 Ω PCB Mount 5A 1.5kV rms - PCB Pin - 250V 100V - -
RS Stock No. 173-8159
Mfr. Part No.DS2E-S-DC24V
BrandPanasonic
MYR16.304
Each (In a Box of 50)
units
24 V dc 200mW DPDT 2.88 k PCB Mount 3A 1.5kV rms - Through Hole - - - - -
RS Stock No. 127-8888
Mfr. Part No.DS2E-S-DC24V
BrandPanasonic
MYR25.94
Each
units
24 V dc 200mW DPDT 2.88 kΩ PCB Mount 3A 1.5kV rms - Through Hole DS - - - -
RS Stock No. 811-3163
Mfr. Part No.JW2ASN-DC24V
BrandPanasonic
MYR10.19
Each
units
24 V dc 530mW DPNO 1.1 kΩ PCB Mount 5A 5kV rms - - - 250V 30V - -
RS Stock No. 173-9225
Mfr. Part No.JW2ASN-DC24V
BrandPanasonic
MYR16.731
Each (In a Box of 100)
units
24 V dc 530mW DPNO 1.1 kΩ PCB Mount 5A 5kV rms - - - 250V 30V - -
RS Stock No. 173-8156
Mfr. Part No.SP2-P-DC24V
BrandPanasonic
MYR130.467
Each (In a Box of 20)
units
24 V dc 300mW DPDT 1.92 k PCB Mount 15A 3kV rms - Through Hole - - - - -
RS Stock No. 127-9516
Mfr. Part No.SP2-P-DC24V
BrandPanasonic
MYR169.93
Each
units
24 V dc 300mW DPDT 1.92 kΩ PCB Mount 15 A 3kV rms - Through Hole - - - Power -
RS Stock No. 173-8926
Mfr. Part No.CB1M24
BrandPanasonic
MYR30.44
Each (In a Box of 50)
units
24 V dc 1.8 SPDT 320 Panel Mount 20A 500V rms - Quick Connect - - 28V dc - -
RS Stock No. 699-5963
Mfr. Part No.CB1M24
BrandPanasonic
MYR34.97
Each
units
24 V dc 1.8W SPDT 320 Ω Panel Mount 20A 500V rms - Quick Connect - - 28V dc - -
RS Stock No. 173-9222
Mfr. Part No.CB1-R-M-12V
BrandPanasonic
MYR28.937
Each (In a Box of 50)
units
12 V dc 1.4W SPDT 103 PCB Mount 40A 500V rms - Quick Connect - - 14V - -
RS Stock No. 173-9218
Mfr. Part No.CB1AH-P-12V
BrandPanasonic
MYR30.781
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. 811-3090
Mfr. Part No.CB1AH-P-12V
BrandPanasonic
MYR30.63
Each
units
12 V dc 1.4W SPST 103 Ω PCB Mount 70A 500V rms - Through Hole - - 14V - -
RS Stock No. 811-3135
Mfr. Part No.CB1-R-M-12V
BrandPanasonic
MYR18.62
Each
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12 V dc 1.4W SPDT 103 Ω PCB Mount 40A 500V rms - Quick Connect - - 14V - -