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. 915-6650
Mfr. Part No.DG85B-7011-75-1012
BrandDurakool
$3.66
Each
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12 V dc 1.81W SPDT 90 Ω Plug In 60A 500V rms - Quick Connect - - 30V dc - 1
RS Stock No. 915-6663
Mfr. Part No.DG85C-7011-75-1012
BrandDurakool
$7.23
Each
units
12 V dc 1.81W SPDT 90 Ω PCB Mount - 500V rms - Quick Connect - - 30V dc - 1
RS Stock No. 915-6626
Mfr. Part No.DG20-7021-35-1012
BrandDurakool
$1.91
Each
units
12 V dc 550mW SPNO 254 Ω Plug In 30A 500V rms - PCB Pin - - 16V dc - 1
RS Stock No. 915-6672
Mfr. Part No.DG85D-7021-75-1012
BrandDurakool
$4.20
Each
units
12 V dc 1.81W SPNO 90 Ω PCB Mount - 500V rms - PCB Pin - - 30V dc - 1
RS Stock No. 915-6638
Mfr. Part No.DG56A-7011-96-1012-M1
BrandDurakool
$3.34
Each
units
12 V dc 1.8W SPDT 85 Ω Plug In - 500V rms - Quick Connect - - 30V dc - 1
RS Stock No. 915-6660
Mfr. Part No.DG85C-7021-76-1012
BrandDurakool
$4.65
Each
units
12 V dc 1.81W SPNO 90 Ω Plug In - 500V rms - Quick Connect - - 30V dc - 1
RS Stock No. 105-8536
Mfr. Part No.DEVR05-5061-S8-1024-R1
BrandDurakool
$121.88
Each
units
24 V dc - - - Flange Mount 50A - - Screw - - - - 1
RS Stock No. 915-6682
Mfr. Part No.DG85F-7011-96-1024-M1
BrandDurakool
$5.88
Each
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24 V dc 2.3W SPDT 250 Ω Plug In 60A 500V rms - Quick Connect - - 24V dc - 1
RS Stock No. 915-6688
Mfr. Part No.DG85F-7011-76-1024-DR
BrandDurakool
$5.89
Each
units
24 V dc 2.3W SPDT 250 Ω Plug In 60A 500V rms - Quick Connect - - 24V dc - 1
RS Stock No. 915-6632
Mfr. Part No.DG81-7011-35-1012
BrandDurakool
$2.20
Each
units
12 V dc 800mW SPDT 180 Ω PCB Mount - 500V rms - PCB Pin - - 16V dc - 1
RS Stock No. 915-6685
Mfr. Part No.DG85F-7011-36-1024
BrandDurakool
$5.98
Each
units
24 V dc 2.3W SPDT 250 Ω Plug In 60A 500V rms - Quick Connect - - 24V dc - 1
RS Stock No. 915-6679
Mfr. Part No.DG85C-7021-76-1012-R
BrandDurakool
$5.49
Each
units
12 V dc 1.81W SPNO 90 Ω Plug In - 500V rms - Quick Connect - - 30V dc - 1
RS Stock No. 915-6629
Mfr. Part No.DG19-7011-35-1024-11
BrandDurakool
$2.96
Each
units
24 V dc 1.5W SPDT 362 Ω PCB Mount 45A 500V rms - PCB Pin - - 30V dc - 1
RS Stock No. 915-6654
Mfr. Part No.DG85B-7011-75-1024
BrandDurakool
$5.02
Each
units
24 V dc 1.81W SPDT 330 Ω Plug In 60A 500V rms - PCB Pin - - 30V dc - 1
RS Stock No. 105-8540
Mfr. Part No.DEVR20-5091-S8-0936-R1
BrandDurakool
$229.10
Each
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36 V dc - - - Flange Mount 200A - - Screw - - - - 1
RS Stock No. 915-6610
Mfr. Part No.DG19-7011-35-1012-11
BrandDurakool
$4.07
Each
units
12 V dc 1.5W SPDT 90 Ω PCB Mount - 500V rms - PCB Pin - - 30V dc - 1
RS Stock No. 915-6622
Mfr. Part No.DG20-7011-35-1012
BrandDurakool
$2.17
Each
units
12 V dc 550mW SPDT 254 Ω Plug In - 500V rms - PCB Pin - - 16V dc - 1
RS Stock No. 915-6648
Mfr. Part No.DG82-7021-36-1012-DR
BrandDurakool
$4.06
Each
units
12 V dc 1.81W SPNO 123 Ω Plug In - 500V rms - Quick Connect - - 16V dc - 1
RS Stock No. 915-6644
Mfr. Part No.DG82-7011-76-1012-R
BrandDurakool
$4.70
Each
units
12 V dc 1.81W SPDT 97 Ω Plug In - 500V rms - Quick Connect - - 16V dc - 1
RS Stock No. 915-6641
Mfr. Part No.DG82-2011-36-1012-DR
BrandDurakool
$4.05
Each
units
12 V dc 1.81W SPDT 97 Ω Plug In - 500V rms - Quick Connect - - 16V dc - 1