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. 622-0531
Mfr. Part No.5TT4201-0
BrandSiemens
$54.82
Each
units
230 V ac 3W SPNO - DIN Rail 16A 4kV - Screw 5TT4 250V ac - - -
RS Stock No. 758-6908
Mfr. Part No.LZX:RT424024
BrandSiemens
$10.11
Each
units
24 V dc - - - Plug In 2.5A - - Screw LZX 230V - - -
RS Stock No. 758-6891
Mfr. Part No.LZX:PT570024
BrandSiemens
$12.61
Each
units
24 V dc - 4PDT - Plug In 6A - - Screw LZX 230V 24V - -
RS Stock No. 758-6876
Mfr. Part No.LZS:RT4A4L24
BrandSiemens
$32.51
Each
units
24 V - DPDT - Plug In 2.5A - - Screw LZS 230V - - -
RS Stock No. 758-6823
Mfr. Part No.LZS:PT3A5L24
BrandSiemens
$30.25
Each
units
24 V dc - 3PDT - Plug In 8A - - Screw LZS 230V 24V - -
RS Stock No. 622-0581
Mfr. Part No.5TT4207-0
BrandSiemens
$109.96
Each
units
230 V ac 3W DPDT - DIN Rail 16A 4kV - Screw 5TT4 400V ac - - -
RS Stock No. 758-6898
Mfr. Part No.LZX:PT270024
BrandSiemens
$12.59
Each
units
24 V dc - DPDT - Plug In 8A - - Screw LZX 230V 24V - -
RS Stock No. 758-6863
Mfr. Part No.LZS:RT3A4T30
BrandSiemens
$35.83
Each
units
230 V ac - SPDT - Plug In - - - Screw LZS - - - -
RS Stock No. 622-0547
Mfr. Part No.5TT4202-0
BrandSiemens
$72.35
Each
units
230 V ac 3W DPNO - DIN Rail 16A 4kV - Screw 5TT4 400V ac - - -
RS Stock No. 622-0553
Mfr. Part No.5TT4204-0
BrandSiemens
$106.50
Each
units
230 V ac 6W 4NO - DIN Rail 16A 4kV - Screw 5TT4 400V ac - - -
RS Stock No. 758-6885
Mfr. Part No.LZS:RT78726
BrandSiemens
$10.81
Each
units
- - - - - - - - - LZS - - - -
RS Stock No. 758-6873
Mfr. Part No.LZS:RT4B4T30
BrandSiemens
$37.21
Each
units
230 V ac - DPDT - Plug In 2.5A - - Screw LZS 230V - - -
RS Stock No. 758-6860
Mfr. Part No.LZS:RT3A4L24
BrandSiemens
$30.88
Each
units
24 V dc - SPDT - Plug In 3A - - Screw LZS 230V - - -
RS Stock No. 758-6867
Mfr. Part No.LZS:RT3B4L24
BrandSiemens
$30.88
Each
units
24 V dc - SPDT - Plug In - - - Screw LZS - - - -
RS Stock No. 622-0569
Mfr. Part No.5TT4205-0
BrandSiemens
$62.15
Each
units
230 V ac 3W SPDT - DIN Rail 16A 4kV - Screw 5TT4 400V ac - - -
RS Stock No. 758-6879
Mfr. Part No.LZS:RT4A4T30
BrandSiemens
$37.21
Each
units
230 V ac - DPDT - Plug In 2.5A - - Screw LZS 230V - - -
RS Stock No. 758-6839
Mfr. Part No.LZS:PT5B5L24
BrandSiemens
$30.25
Each
units
24 V dc - 4PDT - Plug In 6A - - Screw LZS 230V 24V - -
RS Stock No. 758-6882
Mfr. Part No.LZS:RT78725
BrandSiemens
$10.79
Each
units
- - - - - - - - - LZS - - - -
RS Stock No. 758-6835
Mfr. Part No.LZS:PT5A5T30
BrandSiemens
$32.21
Each
units
230 V ac - 4PDT - Plug In 6A - - Screw LZS 230V 24V - -
RS Stock No. 175-2352
Mfr. Part No.3RS1800-2AP00
BrandSiemens
$61.84
Each
units
240 V ac/dc - SPDT - DIN Rail 1 (DC) A, 3 (AC) A - 3 A Cage Clamp 3RS1 240V ac 24V dc - 1