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 Maximum Switching Current DC Terminal Type Series Maximum Switching Voltage AC Maximum Switching Voltage DC Application
RS Stock No. 794-3771
Mfr. Part No.2903370
kr 60,13
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. 290-1416
Mfr. Part No.2961105
kr 45,00
Each
Units
24 V dc - SPDT 3.39 kΩ PCB Mount 10 mA - - - PCB Pin REL-MR- 24DC/21 - - Compact
RS Stock No. 794-3721
Mfr. Part No.2903334
kr 67,49
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. 794-3670
Mfr. Part No.2903304
kr 92,58
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230 V ac - 4PDT 16.1 kΩ DIN Rail 5A - - - Plug In RIF-2-RPT-LV-230AC/4X21 250V ac 250V dc -
RS Stock No. 794-3686
Mfr. Part No.2903308
kr 76,57
Each
Units
24 V dc 770mW 4PDT 640 Ω DIN Rail 6A - - - Plug In RIF 250V ac 250V dc -
RS Stock No. 508-0360
Mfr. Part No.2961480
kr 92,22
Each
Units
230 V ac - DPDT 32.5 kΩ PCB Mount 50mA - - - Through Hole REL-MR-230AC/21-21AU 30V ac 36V dc -
RS Stock No. 794-3743
Mfr. Part No.2903340
kr 76,57
Each
Units
120 V ac - SPDT 8.8 kΩ DIN Rail 25A - - - Plug In RIF-1-RPT-LV-120AC/1X21 250V ac 250V dc -
RS Stock No. 507-9938
Mfr. Part No.2961215
kr 68,99
Each
Units
24 V dc - DPDT 1.44 kΩ PCB Mount 50mA - - - Through Hole REL-MR- 24DC/21-21AU 30V ac 36V dc -
RS Stock No. 794-3831
Mfr. Part No.2903688
kr 56,16
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230 V ac - 4PDT 16.1 kΩ PCB Mount 6A - - - Plug In REL-IR4/L-230AC/4X21 250V ac 250V dc -
RS Stock No. 308-1333
Mfr. Part No.2940391
kr 291,22
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24 V dc - DPDT - DIN Rail - - - - Screw EMG REL - - -
RS Stock No. 508-0023
Mfr. Part No.2961192
kr 42,87
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24 V dc - DPDT 1.44 kΩ PCB Mount 8A - - - Through Hole REL-MR- 24DC/21-21 - - -
RS Stock No. 794-3702
Mfr. Part No.2903315
kr 74,41
Each
Units
24 V dc 77mW DPDT 640 Ω DIN Rail 2A - - - Plug In RIF 250V ac 250V dc -
RS Stock No. 508-0045
Mfr. Part No.2834274
kr 149,46
Each
Units
24 V dc - 3PDT 430 Ω Plug In 10A - - - Through Hole REL-OR- 24DC/3X21 250V ac 250V dc -
RS Stock No. 794-3727
Mfr. Part No.2903333
kr 73,11
Each
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24 V ac - DPDT 350 Ω DIN Rail 12A - - - Plug In RIF-1-RPT-LV-24AC/2X21 250V ac 250V dc -
RS Stock No. 308-1311
Mfr. Part No.2942153
kr 190,86
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24 V dc - SPDT 1.143 kΩ DIN Rail - - - - Screw EMG REL - - -
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Mfr. Part No.2834287
kr 157,41
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Units
24 V ac - 3PDT 62 Ω Plug In 10A - - - Through Hole REL-OR- 24AC/3X21 250V ac 250V dc -
RS Stock No. 794-3761
Mfr. Part No.2903361
kr 51,48
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. 358-8288
Mfr. Part No.2961121
kr 51,28
Each
Units
24 V dc - SPDT 3.39 kΩ PCB Mount 1mA - - - PCB Pin REL-MR- 24DC/21AU - - -
RS Stock No. 794-3642
Mfr. Part No.2903279
kr 163,09
Each
Units
230 V ac 2.8W DPDT 7.08 kΩ DIN Rail 9A - - - Plug In RIF 440V ac 250V dc -
RS Stock No. 794-3705
Mfr. Part No.2903327
kr 89,12
Each
Units
230 V ac - DPDT 32.5 kΩ DIN Rail 50mA - - - Plug In RIF-1-RPT-LV-230AC/2X21AU 30V ac 36V dc -