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.

Read more Read less


Viewing 4181 - 4183 of 4183 products
Results per page
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. 613-4288
Mfr. Part No.G2RV-SL700 AC/DC24
24 V ac/dc - SPDT 1.84 kΩ DIN Rail 6A - - Screw G2RV - - - -
RS Stock No. 683-9084
Mfr. Part No.G4W-2212P-US-TV5 12DC
12 V dc - DPNO 180 Ω PCB Mount 10A - - Through Hole G4W - - - -
RS Stock No. 334-0424
Mfr. Part No.AGN2004H
4.5 V dc 140mW DPDT 145 Ω PCB Mount 1A 1.5kV rms - Through Hole AGN - - - -
Related Products
Lockable test buttonMechanical indicatorOperating temperature: -40°C to +70°CDimensions: ...
Lockable test buttonMechanical indicatorOperating temperature: -40°C to +70°CDimensions: H37.7mm x W27.7mm x D20.7mm.
Contact rating: 10A @ 250VacTest button and mechanical ...
Contact rating: 10A @ 250VacTest button and mechanical indicatorCoil To Contact rating of 2000 VContact Material: AgNi Operating Temperature Range of -40 to +70°CSockets available in section (stock no's. 454-7143 8-pin 454-7159 11-pin).
Indicator and a mechanical test button with two ...
Indicator and a mechanical test button with two positions, one of which is lockable.Can be fitted with series 8630 0024 dual function time switch (357-6948 or 357-6954).
Relays with 2 or 3 rest/work contacts (RT).Permanent ...
Relays with 2 or 3 rest/work contacts (RT).Permanent 16A current.Housing equipped with a lockable mechanical test button.Option to fit with time switch series 86 dual function or multi-function (357-6948 or 357-6954).Mounts on universal supports with panel attachment, assembly on DIN ...