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 Maximum Switching Current DC Terminal Type Series Maximum Switching Voltage AC Maximum Switching Voltage DC Application
RS Stock No. 123-2080
Mfr. Part No.RM84-2012-35-1024
BrandRelpol
€5.66
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24V dc 480mW DPDT 1.44 kΩ PCB Mount 8A 5kV ac - - Plug In RM84 440V 24V -
RS Stock No. 123-2076
Mfr. Part No.R4N-2014-23-1024-WTL
BrandRelpol
€5.79
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24V dc 900mW 4PDT 640 Ω Plug In 6A 2.5kV ac - - Plug In R4N 250V 24V -
RS Stock No. 123-2077
Mfr. Part No.R4N-2014-23-5024-WTL
BrandRelpol
€5.79
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24V ac 1.6W 4PDT 158 Ω Plug In 6A 2.5kV ac - - Plug In R4N 250V 24V -
RS Stock No. 805-2197
Mfr. Part No.R4N-2014-23-5230-WTL
BrandRelpol
€8.33
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230V ac 1.6W 4PDT 16.1 kΩ Plug In 6A 2.5kV ac - - Plug In R4N 250V 24V -
RS Stock No. 805-2220
Mfr. Part No.R15-2013-23-5230-WTL
BrandRelpol
€12.44
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230V ac 2.8W 3PDT 7.08 kΩ Plug In 10A 2.5kV ac - - Plug In R15 440V 24V -
RS Stock No. 805-2141
Mfr. Part No.R2N-2012-23-1012-WTL
BrandRelpol
€6.08
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12V dc 900mW DPDT 160 Ω Plug In 12A 2.5kV ac - - Plug In R2N 440V 24V -
RS Stock No. 805-2201
Mfr. Part No.R15-2012-23-1024-WTL
BrandRelpol
€10.08
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24V dc 1.5W DPDT 430 Ω Plug In 10A 2.5kV ac - - Plug In R15 440V 24V -
RS Stock No. 123-2079
Mfr. Part No.RM84-2012-35-1012
BrandRelpol
€5.66
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12V dc 480mW DPDT 360 Ω PCB Mount 8A 5kV ac - - Plug In RM84 440V 24V -
RS Stock No. 123-2074
Mfr. Part No.R15-2013-23-1024-WTL
BrandRelpol
€12.03
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24V dc 1.5W 3PDT 430 Ω Plug In 10A 2.5kV ac - - Plug In R15 440V 24V -
RS Stock No. 805-2163
Mfr. Part No.R3N-2013-23-1024-WTL
BrandRelpol
€8.13
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24V dc 900mW 3PDT 640 Ω Plug In 10A 2.5kV ac - - Plug In R3N 440V 24V -
RS Stock No. 805-2210
Mfr. Part No.R15-2013-23-1012-WTL
BrandRelpol
€8.71
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12V dc 1.5W 3PDT 110 Ω Plug In 10A 2.5kV ac - - Plug In R15 440V 24V -
RS Stock No. 805-2166
Mfr. Part No.R2N-2012-23-5230-WTL
BrandRelpol
€8.13
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230V ac 1.6W DPDT 16.1 kΩ Plug In 12A 2.5kV ac - - Plug In R2N 440V 24V -
RS Stock No. 123-2090
Mfr. Part No.RM87N-2011-35-1012
BrandRelpol
€2.24
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12V dc 480mW SPDT 360 Ω PCB Mount 12A 5kV ac - - Plug In RM87 440V 24V -
RS Stock No. 805-2204
Mfr. Part No.R15-2012-23-5024-WTL
BrandRelpol
€10.29
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24V ac 2.8W DPDT 75 Ω Plug In 10A 2.5kV ac - - Plug In R15 440V 24V -
RS Stock No. 123-2091
Mfr. Part No.RM87N-2011-35-1024
BrandRelpol
€6.20
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24V dc 480mW SPDT 1.44 kΩ PCB Mount 12A 5kV ac - - Plug In RM87 440V 24V -
RS Stock No. 123-2086
Mfr. Part No.RM85-2011-35-1024
BrandRelpol
€5.66
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24V dc 480mW SPDT 1.44 kΩ PCB Mount 16A 5kV ac - - Plug In RM85 440V 24V -
RS Stock No. 123-2082
Mfr. Part No.RM84-2012-35-5024
BrandRelpol
€5.66
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24V ac 750mW DPDT 400 Ω PCB Mount 8A 5kV ac - - Plug In RM84 440V 24V -
RS Stock No. 805-2191
Mfr. Part No.R15-2012-23-1012-WTL
BrandRelpol
€7.83
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12V dc 1.5W DPDT 110 Ω Plug In 10A 2.5kV ac - - Plug In R15 440V 24V -
RS Stock No. 914-3982
Mfr. Part No.RY2-1012-26-5230
BrandRelpol
€13.98
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253V ac 1.6W DPDT, SPDT 16.1 kΩ DIN Rail - 2.5kV ac - - Faston - 440V 30V -
RS Stock No. 123-2078
Mfr. Part No.R4N-2014-23-5110-WTL
BrandRelpol
€5.79
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110V ac 1.6W 4PDT 3.45 kΩ Plug In 6A 2.5kV ac - - Plug In R4N 250V 24V -