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. 758-6876
Mfr. Part No.LZS:RT4A4L24
BrandSiemens
HK$237.42
Each
units
24 V - DPDT - Plug In 2.5A - Screw LZS 230V - - - 15.5mm
RS Stock No. 758-6891
Mfr. Part No.LZX:PT570024
BrandSiemens
HK$91.23
Each
units
24 V dc - 4PDT - Plug In 6A - Screw LZX 230V 24V - - 22.5mm
RS Stock No. 758-6905
Mfr. Part No.LZX:PT570730
BrandSiemens
HK$106.78
Each
units
230 V ac - 4PDT - Plug In 6A - Screw LZX 230V 24V - - 22.5mm
RS Stock No. 758-6860
Mfr. Part No.LZS:RT3A4L24
BrandSiemens
HK$225.60
Each
units
24 V dc - SPDT - Plug In 3A - Screw LZS 230V - - - 15.5mm
RS Stock No. 758-6882
Mfr. Part No.LZS:RT78725
BrandSiemens
HK$78.00
Each
units
- - - - - - - - LZS - - - - -
RS Stock No. 175-2348
Mfr. Part No.3RQ3118-2AM01
BrandSiemens
HK$320.46
Each
units
- - - - - - - - SIRIUS - - - - 6.2mm
New
RS Stock No. 217-6873
Mfr. Part No.LZX:PT370615
BrandSiemens
HK$100.63
Each
units
115 V ac - - - Base 10A - - LZX - - - - -
RS Stock No. 758-6885
Mfr. Part No.LZS:RT78726
BrandSiemens
HK$78.96
Each
units
- - - - - - - - LZS - - - - -
RS Stock No. 175-2299
Mfr. Part No.3RQ3018-1AB00
BrandSiemens
HK$309.07
Each
units
- - - - - - - - SIRIUS - - - - 6.2mm
RS Stock No. 175-2337
Mfr. Part No.3RQ3118-1AF00
BrandSiemens
HK$339.50
Each
units
- - - - - - - - SIRIUS - - - - 6.2mm
RS Stock No. 622-0531
Mfr. Part No.5TT4201-0
BrandSiemens
HK$345.92
Each
units
230 V ac 3W SPNO - DIN Rail 16A 4kV Screw 5TT4 250V ac - - - 18mm
RS Stock No. 175-2341
Mfr. Part No.3RQ3118-2AB00
BrandSiemens
HK$266.42
Each
units
- - - - - - - - SIRIUS - - - - 6.2mm
RS Stock No. 203-8759
Mfr. Part No.LZX:PT580024
BrandSiemens
HK$115.24
Each
units
24 V dc 741mW 4PDT - Plug In 2A - - LZX - - - - -
RS Stock No. 758-6839
Mfr. Part No.LZS:PT5B5L24
BrandSiemens
HK$231.20
Each
units
24 V dc - 4PDT - Plug In 6A - Screw LZS 230V 24V - - 28mm
RS Stock No. 175-2349
Mfr. Part No.3RS1800-1AP00
BrandSiemens
HK$494.37
Each
units
240 V ac/dc - SPDT - DIN Rail 1 (DC) A, 3 (AC) A - Screw 3RS1 250V ac 250V dc - 1 22.5mm
New
RS Stock No. 217-6860
Mfr. Part No.LZS:RT4A4R24
BrandSiemens
HK$223.738
Each (In a Pack of 5)
units
24 V ac 2W - - - 8A - - LZS - - - - -
New
RS Stock No. 217-6874
Mfr. Part No.LZX:PT520024
BrandSiemens
HK$86.86
Each
units
24 V dc - - - Base 6A - - LZX - - - - -
New
RS Stock No. 217-6868
Mfr. Part No.LZX:MT326024
BrandSiemens
HK$259.17
Each
units
24 V ac - - - Base 10A - - LZX - - - - -
RS Stock No. 175-2326
Mfr. Part No.3RQ3055-1SM30
BrandSiemens
HK$668.21
Each
units
- - - - - - - - SIRIUS - - - - 6.2mm
RS Stock No. 175-2314
Mfr. Part No.3RQ3038-2AB01
BrandSiemens
HK$332.53
Each
units
- - - - - - - - SIRIUS - - - - 6.2mm