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. 290-1416
Mfr. Part No.2961105
MYR33.06
Each
units
24V dc - SPDT 3.39 kΩ PCB Mount 10 mA - PCB Pin REL-MR- 24DC/21 - - Compact 1 28mm
RS Stock No. 508-0023
Mfr. Part No.2961192
MYR21.76
Each
units
24V dc - DPDT 1.44 kΩ PCB Mount 8A - Through Hole REL-MR- 24DC/21-21 - - - - 29mm
RS Stock No. 794-3761
Mfr. Part No.2903361
MYR36.40
Each
units
24V dc 170mW SPNO 3.388 kΩ DIN Rail 6A - Plug In RIF-0-RPT-24DC/1 250V ac 250V dc - - 6.2mm
RS Stock No. 666-7031
Mfr. Part No.2981363
MYR141.41
Each
units
24V dc - DPDT - - - - Screw PSR-SCF- 24UC/URM/2X21 - - - - 75mm
RS Stock No. 794-3746
Mfr. Part No.2903338
MYR36.55
Each
units
24V dc 400mW SPDT 1.44 kΩ DIN Rail 12A - Plug In RIF-1-RPT-LDP-24DC/1X21AU 250V ac 250V dc - - 16mm
RS Stock No. 794-3632
Mfr. Part No.2903275
MYR92.38
Each
units
24V dc 1.7W 3P-NO 345 Ω DIN Rail 10A - Plug In RIF 440V ac 250V dc - - 43mm
RS Stock No. 794-3787
Mfr. Part No.2903659
MYR37.56
Each
units
12V dc 36mW DPDT 160 Ω PCB Mount 30A - Plug In REL-IR 250V ac 250V dc - - 21.2mm
RS Stock No. 794-3755
Mfr. Part No.2903342
MYR53.73
Each
units
24V dc 400mW SPDT 1.44 kΩ DIN Rail 11A 6kV Plug In RIF-1-RPT-LDP-24DC/1X21 250V ac 250V dc - - 16mm
RS Stock No. 507-9938
Mfr. Part No.2961215
MYR36.48
Each
units
24V dc - DPDT 1.44 kΩ PCB Mount 50mA - Through Hole REL-MR- 24DC/21-21AU 30V ac 36V dc - - 12.7mm
RS Stock No. 794-3759
Mfr. Part No.2903359
MYR29.11
Each
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24V dc 170mW SPNO 3.388 kΩ DIN Rail 50mA - Plug In RIF-0-RPT-24DC/ 1AU 30V ac 36V dc - - 6.2mm
RS Stock No. 507-9966
Mfr. Part No.2961422
MYR50.96
Each
units
230V ac - SPDT 32.5 kΩ PCB Mount 16A - Through Hole REL-MR-230AC/21HC 250V ac 250V dc - - 12.7mm
RS Stock No. 507-9972
Mfr. Part No.2961312
MYR17.31
Each
units
24V dc - SPDT 1.44 kΩ PCB Mount 16A - Through Hole REL-MR- 24DC/21HC 250V ac 250V dc - - 12.7mm
RS Stock No. 508-0001
Mfr. Part No.2961257
MYR37.22
Each
units
12V dc - DPDT 360 Ω PCB Mount 8A - Through Hole REL-MR- 12DC/21-21 250V ac 250V dc - - 12.7mm
RS Stock No. 508-0124
Mfr. Part No.2834122
MYR96.05
Each
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24V ac - 4PDT 180 Ω PCB Mount 12A - Through Hole REL-IR/L- 24ADC/4X21 AU 250V ac 250V dc - - 21.5mm
RS Stock No. 857-1370
Mfr. Part No.2903674
MYR426.53
1 Box of 10
Box(es)
125V dc - 4PDT - Plug In - - Plug In REL-IR4/LDP-125DC/4X21AU - - - - 21.2mm
RS Stock No. 358-8288
Mfr. Part No.2961121
MYR34.35
Each
units
24V dc - SPDT 3.39 kΩ PCB Mount 1mA - PCB Pin REL-MR- 24DC/21AU - - - - 28mm
RS Stock No. 794-3888
Mfr. Part No.2903706
MYR69.86
Each
units
24V dc 1.7W 3P-NO 345 Ω PCB Mount 16A - Plug In REL-PR3- 24DC/3X1 440V ac 250V dc - - 38.6mm
RS Stock No. 794-3727
Mfr. Part No.2903333
MYR59.39
Each
units
24V ac - DPDT 350 Ω DIN Rail 12A - Plug In RIF-1-RPT-LV-24AC/2X21 250V ac 250V dc - - 16mm
RS Stock No. 794-3796
Mfr. Part No.2903660
MYR37.56
Each
units
24V dc 77mW DPDT 640 Ω PCB Mount 30A - Plug In REL-IR2/LDP- 24DC/2X21 250V ac 250V dc - - 21.2mm
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Mfr. Part No.2834313
MYR66.258
Each (In a Pack of 10)
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125V dc - 4PDT 17.38 kΩ PCB Mount 1A - Plug In REL-IR 250V 250V - - 21.5mm