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. 136-5242
Mfr. Part No.21011-84
BrandDeltrol
$71.90
Each
units
120 V ac 4.6W 3PDT 970 Ω Plug In 30A - - Quick Connect - - - - 3
RS Stock No. 136-5227
Mfr. Part No.20308-82
BrandDeltrol
$58.38
Each
units
24 V ac 2.2W 3PDT 72 Ω Plug In 13A - - Quick Connect - - - - 3
RS Stock No. 136-5228
Mfr. Part No.20308-84
BrandDeltrol
$59.53
Each
units
120 V ac 2.2W 3PDT 1.85 kΩ Plug In 13A - - Quick Connect - - - - 3
RS Stock No. 136-5240
Mfr. Part No.21011-82
BrandDeltrol
$71.90
Each
units
24 V ac 4.6W 3PDT 38 Ω Plug In 30A - - Quick Connect - - - - 3
RS Stock No. 136-5231
Mfr. Part No.20684-82
BrandDeltrol
$53.34
Each
units
24 V ac 2.2W DPDT 72 Ω Plug In 15A - - Quick Connect - - - - 2
RS Stock No. 136-5234
Mfr. Part No.20852-82
BrandDeltrol
$61.05
Each
units
24 V dc 1.8W DPDT 56 Ω Plug In 35A - - Quick Connect - - - - 2
RS Stock No. 136-5236
Mfr. Part No.20844-82
BrandDeltrol
$56.95
Each
units
24 V ac 2.4W DPDT 56 Ω Plug In 35A - - Quick Connect - - - - 2
RS Stock No. 136-5238
Mfr. Part No.20844-85
BrandDeltrol
$65.17
Each
units
240 V ac 2.4W DPDT 6 kΩ Plug In 35A - - Quick Connect - - - - 2
RS Stock No. 136-5243
Mfr. Part No.21011-85
BrandDeltrol
$81.59
Each
units
240 V ac 4.6W 3PDT 3.8 kΩ Plug In 30A - - Quick Connect - - - - 3
RS Stock No. 136-5226
Mfr. Part No.20311-82
BrandDeltrol
$51.10
Each
units
24 V dc 1.2W 3PDT 480 Ω Plug In 13A - - Quick Connect - - - - 3
RS Stock No. 136-5232
Mfr. Part No.20684-84
BrandDeltrol
$53.34
Each
units
120 V ac 2.2W DPDT 1.85 kΩ Plug In 15A - - Quick Connect - - - - 2
RS Stock No. 136-5239
Mfr. Part No.21014-82
BrandDeltrol
$64.86
Each
units
24 V dc 2.6W 3PDT 230 Ω Plug In 30A - - Quick Connect - - - - 3
RS Stock No. 136-5237
Mfr. Part No.20844-84
BrandDeltrol
$56.95
Each
units
120 V ac 2.4W DPDT 1.5 kΩ Plug In 35A - - Quick Connect - - - - 2
RS Stock No. 136-5245
Mfr. Part No.20241-84
BrandDeltrol
$98.84
Each
units
240 V ac 9.5W DPDT 1.17 kΩ Plug In 30A - - Screw - - - - 2
RS Stock No. 136-5230
Mfr. Part No.20686-82
BrandDeltrol
$50.79
Each
units
24 V dc 1.5W DPDT 375 Ω Plug In 15A - - Quick Connect - - - - 2
RS Stock No. 136-5244
Mfr. Part No.20245-82
BrandDeltrol
$102.90
Each
units
24 V dc 2W DPDT 290 Ω Plug In 30A - - Screw - - - - 2
RS Stock No. 136-5229
Mfr. Part No.20308-85
BrandDeltrol
$58.34
Each
units
240 V ac 2.2W 3PDT 7.2 kΩ Plug In 13A - - Quick Connect - - - - 3