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 Maximum Switching Voltage AC Maximum Switching Voltage DC Application Number of Poles
RS Stock No. 554-762
Mfr. Part No.SIR 312P 24VDC
BrandElesta
£19.01
Each
Units
24V dc - 3PDT 760 Ω PCB Mount 12A - - - Through Hole - - - -
RS Stock No. 554-774
Mfr. Part No.SIP 512 24VDC
BrandElesta
£27.53
Each
Units
24V dc - 4PNO, SPNC, SPNO 440 Ω PCB Mount 16A - - - Through Hole - - - -
RS Stock No. 554-796
Mfr. Part No.SIS 212 24VDC
BrandElesta
£12.28
Each
Units
24V dc - DPNO, SPNC 960 Ω PCB Mount 6A - - - Through Hole - - - -
RS Stock No. 554-784
Mfr. Part No.SIR 222P 24VDC
BrandElesta
£19.01
Each
Units
24V dc - DPDT 760 Ω PCB Mount 12A - - - Through Hole - - - -
RS Stock No. 554-778
Mfr. Part No.SIS 422 24VDC
BrandElesta
£18.58
Each
Units
24V dc - 4PNO, DPST 860 Ω PCB Mount 6A - - - Through Hole - - - -
RS Stock No. 554-807
Mfr. Part No.SIF 422 24VDC
BrandElesta
£16.72
Each
Units
24V dc - 4PNO, DPST 870 Ω PCB Mount 8A - - - Through Hole - - - -
RS Stock No. 554-841
Mfr. Part No.SIS 222 24VDC
BrandElesta
£18.05
Each
Units
24V dc - DPDT 1.15 kΩ PCB Mount 6A - - - Through Hole - - - -
RS Stock No. 554-853
Mfr. Part No.SIS 112 24VDC
BrandElesta
£11.91
Each
Units
24V dc - DPST 2.1 kΩ PCB Mount 6A - - - Through Hole - - - -
RS Stock No. 554-790
Mfr. Part No.SIS 312 24VDC
BrandElesta
£18.05
Each
Units
24V dc - 3PNO, SPNC 1.15 kΩ PCB Mount 6A - - - Through Hole - - - -
RS Stock No. 554-825
Mfr. Part No.SIF 422 12VDC
BrandElesta
£18.58
Each
Units
12V dc - 4PNO, DPST 215 Ω PCB Mount 8A - - - Through Hole - - - -
RS Stock No. 554-780
Mfr. Part No.SIS 422 12VDC
BrandElesta
£18.58
Each
Units
12V dc - 4PNO, DPST 215 Ω PCB Mount 6A - - - Through Hole - - - -
RS Stock No. 554-857
Mfr. Part No.SIS 212 12VDC
BrandElesta
£12.28
Each
Units
12V dc - DPNO, SPNC 240 Ω PCB Mount 6A - - - Through Hole - - - -
RS Stock No. 554-847
Mfr. Part No.SIS 222 12VDC
BrandElesta
£18.05
Each
Units
12V dc - DPDT 285 Ω PCB Mount 6A - - - Through Hole - - - -
RS Stock No. 554-829
Mfr. Part No.SIS 112 12VDC
BrandElesta
£11.91
Each
Units
12V dc - DPST 520 Ω PCB Mount 6A - - - Through Hole - - - -
RS Stock No. 554-803
Mfr. Part No.SIP 512 12VDC
BrandElesta
£27.53
Each
Units
12V dc - 4PNO, SPNC, SPNO 110 Ω PCB Mount 16A - - - Through Hole - - - -
RS Stock No. 554-835
Mfr. Part No.SIF 312 24VDC
BrandElesta
£15.72
Each
Units
24V dc - 3PNO, SPNC 820 Ω PCB Mount 8A - - - Through Hole - - - -
RS Stock No. 554-813
Mfr. Part No.SIF 312 12VDC
BrandElesta
£15.72
Each
Units
12V dc - 3PNO, SPNC 205 Ω PCB Mount 8A - - - Through Hole - - - -