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. 121-8073
Mfr. Part No.HF105F-4/240A1HSTF
$9.92
Each
units
240 V ac 2W SPNO 13.49 kΩ Flange Mount 30A 2.5kV ac Quick Connect - 277V 28V - 1 50mm
RS Stock No. 121-8070
Mfr. Part No.HF105F-4/012D1HSTF
$6.07
Each
units
12 V dc 900mW SPNO 155 Ω Plug In 40A 2.5kV ac Quick Connect - 277V 28V - 1 50mm
RS Stock No. 121-8077
Mfr. Part No.HF105F-4/240A1ZSTF
$16.37
Each
units
240 V ac 2W SPDT 13.49 kΩ Flange Mount 20A 2.5kV ac Quick Connect - 277V 28V - 1 50mm
RS Stock No. 121-8069
Mfr. Part No.HF92F-240A-2C21S
$29.81
Each
units
240 V ac 4W DPDT 3.8 kΩ Flange Mount 30A 4kV ac Quick Connect - 277V - - 1 68.6mm
RS Stock No. 923-2556
Mfr. Part No.HF18FHA2404Z1D
$14.78
Each
units
240 V ac 1.8W 4PDT 14.4 kΩ Chassis Mount 5A 1.5kV Plug In - 250V 30V - 4 28mm
RS Stock No. 121-8074
Mfr. Part No.HF105F-4/012D1ZSTF
$10.12
Each
units
12 V dc 900mW SPDT 155 Ω Flange Mount 20A 2.5kV ac Quick Connect - 277V 28V - 1 50mm
RS Stock No. 121-8057
Mfr. Part No.HF116F-1/230AF-2HTFW
$25.12
Each
units
230 V ac 2.7W DPNO 20.8 kΩ Flange Mount 25A 4kV ac Screw - 277V - - 2 68mm
RS Stock No. 121-8065
Mfr. Part No.HF116F-3/230AF-2HTFW
$27.38
Each
units
230 V ac 2.7W DPNO 20.8 kΩ Flange Mount 25A 4kV ac Screw - 277V - - 2 68mm
RS Stock No. 923-2616
Mfr. Part No.HF41F-024-ZT
$6.83
Each
units
24 V dc 170mW SPDT 3.39 kΩ PCB Mount 6A 4kV ac PCB Pin - 400V 125V - 1 28mm
RS Stock No. 923-2546
Mfr. Part No.HF18FH0124Z1D
$12.08
Each
units
12 V dc 1.1W 4PDT 160 Ω Chassis Mount 5A 1.5kV Plug In - 250V 30V - 4 28mm
RS Stock No. 923-2607
Mfr. Part No.HF41F-012-ZT
$6.21
Each
units
12 V dc 170mW SPDT 848 Ω PCB Mount 6A 4kV ac PCB Pin - 400V 125V - 1 28mm
RS Stock No. 121-8076
Mfr. Part No.HF105F-4/120A1ZSTF
$13.26
Each
units
120 V ac 2W SPDT 2.5 kΩ Flange Mount 20A 2.5kV ac Quick Connect - 277V 28V - 1 50mm
RS Stock No. 923-2540
Mfr. Part No.HF18FH0244Z1D
$11.96
Each
units
24 V dc 1.1W 4PDT 650 Ω Chassis Mount 5A 1.5kV Plug In - 250V 30V - 4 28mm
RS Stock No. 121-8061
Mfr. Part No.HF116F-3/230AF-1HTFW
$28.44
Each
units
230 V ac 2.7W SPNO 20.8 kΩ Flange Mount 30A 4kV ac Screw - 277V - - 1 68mm
RS Stock No. 121-8071
Mfr. Part No.HF105F-4/024D1HSTF
$5.68
Each
units
24 V dc 900mW SPNO 660 Ω Flange Mount 40A 2.5kV ac Quick Connect - 277V 28V - 1 50mm
RS Stock No. 121-8059
Mfr. Part No.HF116F-3/024DF-1HTFW
$19.41
Each
units
24 V dc 1.9W SPNO 300 Ω Flange Mount 30A 4kV ac Screw - 277V - - 1 68mm
RS Stock No. 121-8051
Mfr. Part No.HF116F-1/024DF-1HTFW
$16.25
Each
units
24 V dc 1.9W SPNO 300 Ω Flange Mount 30A 4kV ac Screw - 277V - - 1 68mm
RS Stock No. 923-2593
Mfr. Part No.HF10FH024D3ZDT
$20.29
Each
units
24 V dc 1.5W 3PDT 430 Ω Plug In 10A 2.5kV ac Plug In - 250V 30V - 3 35.5mm
RS Stock No. 121-8050
Mfr. Part No.HF116F-1/012DF-1HTFW
$18.45
Each
units
12 V dc 1.9W SPNO 75 Ω Flange Mount 30A 4kV ac Screw - 277V - - 1 68mm
RS Stock No. 121-8075
Mfr. Part No.HF105F-4/024D1ZSTF
$8.96
Each
units
24 V dc 900mW SPDT 660 Ω Flange Mount 20A 2.5kV ac Quick Connect - 277V 28V - 1 50mm