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
HK$141.46
Each
units
24 V dc - SPDT 3.39 kΩ PCB Mount 10 mA - PCB Pin REL-MR- 24DC/21 - - Compact 1 28mm
RS Stock No. 358-8288
Mfr. Part No.2961121
HK$150.90
Each
units
24 V dc - SPDT 3.39 kΩ PCB Mount 1mA - PCB Pin REL-MR- 24DC/21AU - - - - 28mm
RS Stock No. 508-0023
Mfr. Part No.2961192
HK$80.21
Each
units
24 V dc - DPDT 1.44 kΩ PCB Mount 8A - Through Hole REL-MR- 24DC/21-21 - - - - 29mm
RS Stock No. 857-1383
Mfr. Part No.2903661
HK$504.28
1 Box of 10
Box(es)
48 V dc - DPDT - Plug In - - Plug In REL-IR2/LDP- 48DC/2X21 - - - - 21.2mm
RS Stock No. 508-0045
Mfr. Part No.2834274
HK$93.58
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24 V dc - 3PDT 430 Ω Plug In 10A - Through Hole REL-OR- 24DC/3X21 250V ac 250V dc - - 52.5mm
RS Stock No. 508-0449
Mfr. Part No.2834300
HK$202.37
Each
units
230 V ac - 3PDT 6.17 kΩ Plug In 10A - Through Hole REL-OR-230AC/3X21 250V ac 250V dc - - 52.5mm
RS Stock No. 308-1311
Mfr. Part No.2942153
HK$195.97
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24 V dc - SPDT 1.143 kΩ DIN Rail - - Screw EMG REL - - - - 75mm
RS Stock No. 507-9972
Mfr. Part No.2961312
HK$68.71
Each
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24 V dc - SPDT 1.44 kΩ PCB Mount 16A - Through Hole REL-MR- 24DC/21HC 250V ac 250V dc - - 12.7mm
RS Stock No. 794-3771
Mfr. Part No.2903370
HK$94.38
Each
units
24 V dc 170mW SPDT 3.388 kΩ DIN Rail 6A - Plug In RIF-0-RPT-24DC/21 250V ac 250V dc - - 6.2mm
RS Stock No. 794-3759
Mfr. Part No.2903359
HK$69.46
Each
units
24 V 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. 794-3755
Mfr. Part No.2903342
HK$85.66
Each
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24 V 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. 308-1333
Mfr. Part No.2940391
HK$295.50
Each
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24 V dc - DPDT - DIN Rail - - Screw EMG REL - - - - 75mm
RS Stock No. 508-0001
Mfr. Part No.2961257
HK$77.87
Each
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12 V dc - DPDT 360 Ω PCB Mount 8A - Through Hole REL-MR- 12DC/21-21 250V ac 250V dc - - 12.7mm
RS Stock No. 794-3806
Mfr. Part No.2903669
HK$74.70
Each
units
12 V dc 36mW 4PDT 160 Ω PCB Mount 50mA - Plug In REL-IR4/LDP- 12DC/4X21AU 30V ac 36V dc - - 21.2mm
RS Stock No. 794-3761
Mfr. Part No.2903361
HK$77.70
Each
units
24 V 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. 794-3721
Mfr. Part No.2903334
HK$98.06
Each
units
24 V dc 400mW DPDT 1.44 kΩ DIN Rail 2A - Plug In RIF-1-RPT-LDP-24DC/2X21 250V ac 250V dc - - 16mm
RS Stock No. 794-3715
Mfr. Part No.2903331
HK$120.73
Each
units
230 V ac - DPDT 32.5 kΩ DIN Rail 8A - Plug In RIF-1-RPT-LV-230AC/2X21 250V ac 250V dc - - 16mm
RS Stock No. 508-0067
Mfr. Part No.2834232
HK$76.30
Each
units
24 V dc - DPDT 430 Ω Plug In 10A - Through Hole REL-OR- 24DC/2X21 AU 250V ac 250V dc - - 52.5mm
RS Stock No. 666-7031
Mfr. Part No.2981363
HK$264.77
Each
units
24 V dc - DPDT - - - - Screw PSR-SCF- 24UC/URM/2X21 - - - - 75mm
RS Stock No. 794-3774
Mfr. Part No.2903368
HK$89.69
Each
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24 V dc 170mW SPDT 3.388 kΩ DIN Rail 50mA - Plug In RIF-0-RPT-24DC/21AU 30V ac 36V dc - - 6.2mm