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. 123-2074
Mfr. Part No.R15-2013-23-1024-WTL
BrandRelpol
HK$103.76
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24 V dc 1.5W 3PDT 430 Ω Plug In 10A 2.5kV ac Plug In R15 440V 24V - 3 35mm
RS Stock No. 805-2172
Mfr. Part No.R3N-2013-23-5024-WTL
BrandRelpol
HK$86.49
Each
units
24 V ac 1.6W 3PDT 158 Ω Plug In 10A 2.5kV ac Plug In R3N 440V 24V - - 35mm
RS Stock No. 805-2197
Mfr. Part No.R4N-2014-23-5230-WTL
BrandRelpol
HK$88.77
Each
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230 V ac 1.6W 4PDT 16.1 kΩ Plug In 6A 2.5kV ac Plug In R4N 250V 24V - - 21.2mm
RS Stock No. 123-2077
Mfr. Part No.R4N-2014-23-5024-WTL
BrandRelpol
HK$49.99
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24 V ac 1.6W 4PDT 158 Ω Plug In 6A 2.5kV ac Plug In R4N 250V 24V - 4 27.4mm
RS Stock No. 805-2191
Mfr. Part No.R15-2012-23-1012-WTL
BrandRelpol
HK$68.87
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12 V dc 1.5W DPDT 110 Ω Plug In 10A 2.5kV ac Plug In R15 440V 24V - - 35mm
RS Stock No. 805-2141
Mfr. Part No.R2N-2012-23-1012-WTL
BrandRelpol
HK$64.75
Each
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12 V dc 900mW DPDT 160 Ω Plug In 12A 2.5kV ac Plug In R2N 440V 24V - - 21.2mm
RS Stock No. 134-8399
Mfr. Part No.RM50-3011-85-1009
BrandRelpol
HK$29.06
Each
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9 V dc 360mW SPDT 225 Ω PCB Mount 15A 1kV ac PCB Pin - 240/277V ac 48V dc - 1 19mm
RS Stock No. 123-2092
Mfr. Part No.RM87N-2011-35-5024
BrandRelpol
HK$40.27
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24 V ac 750mW SPDT 400 Ω PCB Mount 12A 5kV ac Plug In RM87 440V 24V - 1 29mm
RS Stock No. 123-2093
Mfr. Part No.RM87N-2011-35-5110
BrandRelpol
HK$62.12
Each
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110 V ac 750mW SPDT 8.9 kΩ PCB Mount 12A 5kV ac Plug In RM87 440V 24V - 1 29mm
RS Stock No. 914-3973
Mfr. Part No.RY2-2012-26-1024
BrandRelpol
HK$116.23
Each
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26.4 V dc 900mW DPDT, SPDT 640 Ω DIN Rail - 2.5kV ac Faston - 440V 30V - 2 27.5mm
RS Stock No. 134-8400
Mfr. Part No.RM50-3011-85-1012
BrandRelpol
HK$29.06
Each
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12 V dc 360mW SPDT 400 Ω PCB Mount 15A 1kV ac PCB Pin - 240/277V ac 48V dc - 1 19mm
RS Stock No. 123-2081
Mfr. Part No.RM84-2012-35-5012
BrandRelpol
HK$48.55
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12 V ac 750mW DPDT 100 Ω PCB Mount 8A 5kV ac Plug In RM84 440V 24V - 2 29mm
RS Stock No. 914-3998
Mfr. Part No.RG25-1022-28-1024
BrandRelpol
HK$203.52
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26.4 V dc 1.7W DPDT, DPNO 340 Ω DIN Rail - 5kV ac Screw - 440V 24V - 2 26mm
RS Stock No. 134-8395
Mfr. Part No.RM40-2011-85-1012
BrandRelpol
HK$59.95
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12 V dc 200mW SPDT 720 Ω PCB Mount 5A 4kV ac PCB Pin - 380V ac 48V dc - 1 20mm
RS Stock No. 123-2094
Mfr. Part No.RM87N-2011-35-5230
BrandRelpol
HK$62.12
Each
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230 V ac 750mW SPDT 38.5 kΩ PCB Mount 12A 5kV ac Plug In RM87 440V 24V - 1 29mm
RS Stock No. 134-8409
Mfr. Part No.RM96-1011-35-1009
BrandRelpol
HK$47.48
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9 V dc 220 300mW - 360 Ω PCB Mount 8A 4kV ac PCB Pin - 440V 24V - 1 30mm
RS Stock No. 123-2085
Mfr. Part No.RM85-2011-35-1012
BrandRelpol
HK$48.55
Each
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12 V dc 480mW SPDT 360 Ω PCB Mount 16A 5kV ac Plug In RM85 440V 24V - 1 29mm
RS Stock No. 805-2153
Mfr. Part No.R2N-2012-23-5024-WTL
BrandRelpol
HK$64.75
Each
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24 V ac 1.6W DPDT 158 Ω Plug In 12A 2.5kV ac Plug In R2N 440V 24V - - 21.2mm
RS Stock No. 134-8388
Mfr. Part No.RM12-3221-35-1012
BrandRelpol
HK$36.26
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12 V dc 250mW SPNO 580 Ω PCB Mount 8A 5kV ac PCB Pin - 400V 24V - 1 28.5mm
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Mfr. Part No.R4N-2014-23-1012-WTL
BrandRelpol
HK$81.80
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12 V dc 900mW 4PDT 160 Ω Plug In 6A 2.5kV ac Plug In R4N 250V 24V - - 21.2mm