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. 345-965
Mfr. Part No.C3-A30X / DC 24 V
BrandReleco
$42.12
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24V dc - 3PDT 443 Ω Plug In 10A - Plug In MRC - - - - 35mm
RS Stock No. 341-5168
Mfr. Part No.C10-A10BX / AD 24 V
BrandReleco
$22.80
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24V ac/dc 1.1W SPDT 290 (ac) Ω, 742 (dc) Ω Plug In 10A 5kV Quick Connect C10 250V ac 30V dc - - 28.8mm
RS Stock No. 352-474
Mfr. Part No.C3-A30X-230VAC
BrandReleco
$41.27
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230V ac 2.2W 3PDT 7.001 kΩ Plug In 10A 2.5kV Plug In MRC 250V ac 30V dc - - 35mm
RS Stock No. 376-391
Mfr. Part No.C7-A20X / DC 24 V
BrandReleco
$29.05
Each
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24V dc 1W DPDT 594 Ω Plug In 10A - Quick Connect C7 - 30V dc - - 28mm
RS Stock No. 376-458
Mfr. Part No.C9-A41X / AC 24 V
BrandReleco
$33.61
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24V ac - 4PDT 174 Ω Plug In 5A - Quick Connect C9 - - - 4 28mm
RS Stock No. 345-971
Mfr. Part No.C3-A30X / AC 24 V
BrandReleco
$32.06
Each
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24V - 3PDT 67 Ω Plug In 10A - Plug In MRC - - - - 35mm
RS Stock No. 341-5146
Mfr. Part No.C10-A10X / DC 24 V
BrandReleco
$20.16
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24V dc 650mW SPDT 742 Ω Plug In 10A 5kV Quick Connect C10 - - - 1 -
RS Stock No. 376-470
Mfr. Part No.C9-A41X / AC 230 V
BrandReleco
$32.12
Each
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230V ac 1.2W 4PDT 18.006 kΩ Plug In 5A 2.5kV Quick Connect C9 250V ac 30V dc - 4 28mm
RS Stock No. 613-8022
Mfr. Part No.C12A21X24D
BrandReleco
$19.60
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24V dc 700mW DPDT 742 Ω PCB Mount 5A 5kV Quick Connect C12 250V ac 250V dc - 2 28.8mm
RS Stock No. 345-886
Mfr. Part No.C2-A20X / DC 24V
BrandReleco
$31.51
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24V dc - DPDT 433 Ω Plug In 10A - Plug In MRC - - - - 35mm
RS Stock No. 350-399
Mfr. Part No.C3-R20 / AC 24 V
BrandReleco
$76.10
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24V ac 1.5W DPDT 75 Ω PCB Mount 30A - Through Hole C3 250V ac - - - 35mm
RS Stock No. 345-870
Mfr. Part No.C2-A20X / DC 12V
BrandReleco
$27.87
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12V dc 1.3W DPDT 110 Ω Plug In 10A 2.5kV Plug In C2 250V ac 30V dc - - 35mm
RS Stock No. 376-436
Mfr. Part No.C9-A41X / DC 12 V
BrandReleco
$26.33
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12V dc - 4PDT 148 Ω Plug In 5A - Quick Connect C9 - - - 4 28mm
RS Stock No. 376-442
Mfr. Part No.C9-A41X / DC 24 V
BrandReleco
$25.77
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24V dc - 4PDT 594 Ω Plug In 5A - PCB Pin C9 - - - - 28mm
RS Stock No. 376-408
Mfr. Part No.C7-A20X / AC 24 V
BrandReleco
$26.93
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24V 1.5W DPDT 174 Ω Plug In 10A - Quick Connect C7 250V ac - - - 28mm
RS Stock No. 376-420
Mfr. Part No.C7-A20X / AC 230 V
BrandReleco
$31.29
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230V ac 1.5W DPDT 11.006 kΩ Plug In 10A 2.5kV Quick Connect C7 250V ac - - - 28mm
RS Stock No. 206-2173
Mfr. Part No.C7-T21X / DC 24 V
BrandReleco
$41.19
Each
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24V dc 900mW DPDT 594 Ω PCB Mount 6A 2.5kV Quick Connect C7 250V ac - - 2 35mm
RS Stock No. 341-5269
Mfr. Part No.C10-T13 X / AC 230 V
BrandReleco
$26.15
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230V ac 1.1W SPDT 28.8 kΩ PCB Mount 6A 5kV Quick Connect C10 250V ac 30V dc - - 28.8mm
RS Stock No. 206-2189
Mfr. Part No.C7-T21X / AC 230 V
BrandReleco
$35.42
Each
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230V ac 1.2W DPDT 18.006 kΩ PCB Mount 6A 2.5kV Through Hole C7 250V ac 30V dc - - 35mm
RS Stock No. 613-8066
Mfr. Part No.C12A21X230A
BrandReleco
$26.70
Each
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230V ac 1.1W DPDT 28.8 kΩ PCB Mount 5A 5kV Through Hole C12 250V 30V - - 28.8mm