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. 857-3026
Mfr. Part No.RCP1100324VDC
24 V dc 1.5W 3PDT 430 Ω Plug In 10A 3.75kV ac Plug In RCP 250V 30V - - 35.5mm
RS Stock No. 857-2774
Mfr. Part No.RMIA45024AC
24 V ac 1.2W 4PDT 650 Ω Plug In 5A 3.75kV ac PCB Pin RMI A45 250V 30V - - 28mm
RS Stock No. 859-3430
Mfr. Part No.RCP800224VDC
24 V dc 1.5W DPDT 430 Ω Plug In 10A 3.75kV ac Plug In RCP 250V 30V - - 35.5mm
RS Stock No. 859-3171
Mfr. Part No.SL150115
115 V ac - SPDT - - - - Pin - 250V ac - - - -
RS Stock No. 859-3254
Mfr. Part No.RMIA45230AC
230 V ac 1.2W 4PDT 11 kΩ Plug In 5A 3.75kV ac PCB Pin RCP 250V 30V - - 28mm
RS Stock No. 856-8374
Mfr. Part No.RA 2425-D06T
32 V dc - - - Panel Mount 25A - Screw RA 2 265V - - - 44.5mm
RS Stock No. 857-3017
Mfr. Part No.RCP11003230VAC
230 V ac 2.5W 3PDT 11 kΩ Plug In 10A 3.75kV ac Plug In RCP 250V 30V - - 35.5mm