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. 758-6835
Mfr. Part No.LZS:PT5A5T30
BrandSiemens
TWD878.00
Each
units
230 V ac - 4PDT - Plug In 6A - Screw LZS 230V 24V - - 28mm
RS Stock No. 758-6908
Mfr. Part No.LZX:RT424024
BrandSiemens
TWD275.00
Each
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24 V dc - - - Plug In 2.5A - Screw LZX 230V - - - 12.5mm
RS Stock No. 175-2324
Mfr. Part No.3RQ3053-1SG30
BrandSiemens
TWD2,745.00
Each
units
- - - - - - - - SIRIUS - - - - 6.2mm
RS Stock No. 175-2313
Mfr. Part No.3RQ3038-1AF01
BrandSiemens
TWD1,948.00
Each
units
- - - - - - - - SIRIUS - - - - 6.2mm
New
RS Stock No. 217-6865
Mfr. Part No.LZS:RT4D4R24
BrandSiemens
TWD881.40
Each (In a Pack of 5)
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24 V ac 2W - - - 8A - - LZS - - - - -
RS Stock No. 175-2317
Mfr. Part No.3RQ3050-1SM50
BrandSiemens
TWD2,493.00
Each
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- - - - - - - - SIRIUS - - - - 6.2mm
New
RS Stock No. 217-6843
Mfr. Part No.LZS:PT5A5S15
BrandSiemens
TWD832.00
Each (In a Pack of 5)
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115 V ac 4W - - - 6A - - LZS - - - - -
RS Stock No. 622-0531
Mfr. Part No.5TT4201-0
BrandSiemens
TWD1,242.00
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230 V ac 3W SPNO - DIN Rail 16A 4kV Screw 5TT4 250V ac - - - 18mm
RS Stock No. 175-2301
Mfr. Part No.3RQ3018-1AF00
BrandSiemens
TWD1,447.00
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- - - - - - - - SIRIUS - - - - 6.2mm
RS Stock No. 203-8698
Mfr. Part No.LZS:PT5A5R24
BrandSiemens
TWD889.80
Each (In a Pack of 5)
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24 V ac - - - - 6A - - Sirius LZS - - - - -
RS Stock No. 758-6891
Mfr. Part No.LZX:PT570024
BrandSiemens
TWD344.00
Each
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24 V dc - 4PDT - Plug In 6A - Screw LZX 230V 24V - - 22.5mm
New
RS Stock No. 217-6863
Mfr. Part No.LZS:RT4B4R24
BrandSiemens
TWD839.60
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24 V ac 2W - - - 8A - - LZS - - - - -
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RS Stock No. 217-6841
Mfr. Part No.LZS:PT3A5S15
BrandSiemens
TWD832.00
Each (In a Pack of 5)
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115 V 3W - - - 10A - - LZS - - - - -
RS Stock No. 175-2343
Mfr. Part No.3RQ3118-2AE00
BrandSiemens
TWD1,093.00
Each
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- - - - - - - - SIRIUS - - - - 6.2mm
RS Stock No. 175-2320
Mfr. Part No.3RQ3052-1SM40
BrandSiemens
TWD2,577.00
Each
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- - - - - - - - SIRIUS - - - - 6.2mm
RS Stock No. 175-2302
Mfr. Part No.3RQ3018-2AB00
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TWD1,359.00
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- - - - - - - - SIRIUS - - - - 6.2mm
RS Stock No. 175-2338
Mfr. Part No.3RQ3118-1AF01
BrandSiemens
TWD1,195.00
Each
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- - - - - - - - SIRIUS - - - - 6.2mm
RS Stock No. 175-2315
Mfr. Part No.3RQ3038-2AF00
BrandSiemens
TWD1,856.00
Each
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- - - - - - - - SIRIUS - - - - 6.2mm
New
RS Stock No. 217-6866
Mfr. Part No.LZS:RT4D4T30
BrandSiemens
TWD1,006.80
Each (In a Pack of 5)
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230 V ac 2W - - - 8A - - LZS - - - - -
RS Stock No. 175-2318
Mfr. Part No.3RQ3050-2SM50
BrandSiemens
TWD2,493.00
Each
units
- - - - - - - - SIRIUS - - - - 6.2mm