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. 290-1416
Mfr. Part No.2961105
$23.18
Each
units
24 V dc - SPDT 3.39 kΩ PCB Mount 10 mA - - PCB Pin REL-MR- 24DC/21 - - Compact 1
RS Stock No. 794-3771
Mfr. Part No.2903370
$15.58
Each
units
24 V dc 170mW SPDT 3.388 kΩ DIN Rail 6A - - Plug In RIF-0-RPT-24DC/21 250V ac 250V dc - -
RS Stock No. 794-3761
Mfr. Part No.2903361
$12.61
Each
units
24 V dc 170mW SPNO 3.388 kΩ DIN Rail 6A - - Plug In RIF-0-RPT-24DC/1 250V ac 250V dc - -
RS Stock No. 507-9972
Mfr. Part No.2961312
$12.16
Each
units
24 V dc - SPDT 1.44 kΩ PCB Mount 16A - - Through Hole REL-MR- 24DC/21HC 250V ac 250V dc - -
RS Stock No. 794-3780
Mfr. Part No.2903371
$16.52
Each
units
12 V dc 170mW SPDT 847 Ω DIN Rail 6A - - Plug In RIF-0-RPT-12DC/21 250V ac 250V dc - -
RS Stock No. 794-3686
Mfr. Part No.2903308
$18.51
Each
units
24 V dc 770mW 4PDT 640 Ω DIN Rail 6A - - Plug In RIF 250V ac 250V dc - -
RS Stock No. 794-3721
Mfr. Part No.2903334
$15.36
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 - -
RS Stock No. 794-3765
Mfr. Part No.2903362
$15.31
Each
units
12 V dc 170mW SPNO 847 Ω DIN Rail 6A - - Plug In RIF-0-RPT-12DC/ 1 250V ac 250V dc - -
RS Stock No. 794-3831
Mfr. Part No.2903688
$12.46
Each
units
230 V ac - 4PDT 16.1 kΩ PCB Mount 6A - - Plug In REL-IR4/L-230AC/4X21 250V ac 250V dc - -
RS Stock No. 794-3727
Mfr. Part No.2903333
$15.73
Each
units
24 V ac - DPDT 350 Ω DIN Rail 12A - - Plug In RIF-1-RPT-LV-24AC/2X21 250V ac 250V dc - -
RS Stock No. 508-0023
Mfr. Part No.2961192
$17.18
Each
units
24 V dc - DPDT 1.44 kΩ PCB Mount 8A - - Through Hole REL-MR- 24DC/21-21 - - - -
RS Stock No. 794-3787
Mfr. Part No.2903659
$10.68
Each
units
12 V dc 36mW DPDT 160 Ω PCB Mount 30A - - Plug In REL-IR 250V ac 250V dc - -
RS Stock No. 358-8288
Mfr. Part No.2961121
$15.44
Each
units
24 V dc - SPDT 3.39 kΩ PCB Mount 1mA - - PCB Pin REL-MR- 24DC/21AU - - - -
RS Stock No. 794-3715
Mfr. Part No.2903331
$21.32
Each
units
230 V ac - DPDT 32.5 kΩ DIN Rail 8A - - Plug In RIF-1-RPT-LV-230AC/2X21 250V ac 250V dc - -
RS Stock No. 794-3752
Mfr. Part No.2903341
$18.00
Each
units
24 V ac - SPDT 350 Ω DIN Rail 10A - - Plug In RIF-1-RPT-LV-24AC/1X21 250V ac 250V dc - -
RS Stock No. 794-3774
Mfr. Part No.2903368
$15.58
Each
units
24 V dc 170mW SPDT 3.388 kΩ DIN Rail 50mA - - Plug In RIF-0-RPT-24DC/21AU 30V ac 36V dc - -
RS Stock No. 666-7034
Mfr. Part No.2963747
$94.10
Each
units
24 V dc - DPST, 5PNO - - - - - Screw PSR-SCP - - - -
RS Stock No. 290-1422
Mfr. Part No.2961118
$13.83
Each
units
- - - - - - - - - - - - - -
RS Stock No. 308-1311
Mfr. Part No.2942153
$98.29
Each
units
24 V dc - SPDT 1.143 kΩ DIN Rail - - - Screw EMG REL - - - -
RS Stock No. 794-3670
Mfr. Part No.2903304
$19.22
Each
units
230 V ac - 4PDT 16.1 kΩ DIN Rail 5A - - Plug In RIF-2-RPT-LV-230AC/4X21 250V ac 250V dc - -