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. 884-1304
Mfr. Part No.RXM4AB2P7
R 112.13
Each
units
230 V ac 1.2W 4PDT 15 kΩ Plug In 8A - - - Plug In - 250V - -
RS stock no. 884-1313
Mfr. Part No.RXM4AB2BD
R 117.36
Each
units
24 V dc 900mW 4PDT 650 Ω Plug In 8A - - - Plug In RXM 250V - -
RS stock no. 827-8582
Mfr. Part No.389FXBXC1-240A
R 375.98
Each
units
240 V ac 3.5W DPDT 7.2 kΩ Flange Mount 13A 2kV ac - - Quick Connect - 600V 28V -
RS stock no. 884-1414
Mfr. Part No.RXM2AB1BD
R 97.22
Each
units
24 V dc 900mW DPDT 650 Ω Plug In 12A - - - Plug In - 250V - -
RS stock no. 884-1307
Mfr. Part No.RXM4AB1P7
R 100.76
Each
units
230 V ac 1.2W 4PDT 15 kΩ Plug In 8A - - - Plug In - 250V - -
RS stock no. 922-1717
Mfr. Part No.RXG15M7
R 121.66
Each
units
220 V ac 820mW SPST-C/O 21 kΩ Plug In - 5kV ac - - Plug In - 250V 30V -
RS stock no. 828-3149
Mfr. Part No.RPF2AP7
R 185.474
Each (In a Pack of 10)
units
230 V ac 4W DPNO 6.5 kΩ Panel Mount 30A 2.5kV ac - - Plug In - 250V 250V -
RS stock no. 884-1540
Mfr. Part No.RXM4AB1JD
R 123.77
Each
units
12 V dc 900mW 4PDT 160 Ω Plug In 8A - - - Plug In - 250V - -
RS stock no. 922-1708
Mfr. Part No.RXG15JD
R 77.15
Each
units
12 V dc 530mW SPST-C/O 270 Ω Plug In 10A 5kV ac - - Plug In - 250V 30V -
RS stock no. 884-1420
Mfr. Part No.RXM2AB1F7
R 99.55
Each
units
120 V ac 1.2W DPDT 3.63 kΩ Plug In 12A - - - Plug In - 250V - -
RS stock no. 814-8239
Mfr. Part No.W9AS5D52-5
R 83.92
Each
units
5 V dc 2.8W SPNO 25 Ω Flange Mount 30A 2.5kV ac - - Quick Connect - 300V - -
RS stock no. 124-0198
Mfr. Part No.RPF2AP7
R 179.83
Each
units
253 V ac - DPNO 15.6 kΩ DIN Rail 30A 4kV ac - - Plug In - 250V 250V -
RS stock no. 884-1458
Mfr. Part No.RXM2AB2P7
R 106.64
Each
units
230 V ac 1.2W DPDT 15 kΩ Plug In 12A - - - Plug In - 250V - -
RS stock no. 884-1290
Mfr. Part No.RXM4AB1BD
R 99.89
Each
units
24 V dc 900mW 4PDT 650 Ω Plug In 8A - - - Plug In - 250V - -
RS stock no. 852-6822
Mfr. Part No.RXG12JD
R 115.38
Each
units
12 V dc 530mW SPDT 270 Ω Plug In 10A 5kV ac - - Plug In - 250V 30V -
RS stock no. 814-8462
Mfr. Part No.92S7D22D-12
R 125.81
Each
units
12 V dc 4W DPNO 86 Ω Panel Mount 20A 4kV ac - - Quick Connect - 300V - -
RS stock no. 852-6840
Mfr. Part No.RXG22BD
R 134.23
Each
units
24 V dc 530mW DPDT 1.1 kΩ Plug In 5A 5kV ac - - Plug In - 250V 30V -
RS stock no. 884-1433
Mfr. Part No.RXM2AB1JD
R 99.82
Each
units
12 V dc 900mW DPDT 160 Ω Plug In 12A - - - Plug In - 250V - -
RS stock no. 922-1666
Mfr. Part No.RXG12M7
R 160.77
Each
units
220 V ac 820mW SPST-C/O 21 kΩ Plug In - 5kV ac - - Plug In - 250V 30V -
RS stock no. 852-6825
Mfr. Part No.RXG12B7
R 160.83
Each
units
24 V ac 820mW SPDT 260 Ω Plug In 10A 5kV ac - - Plug In - 250V 30V -