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. 842-3436
Mfr. Part No.C10-A10X/005VDC
BrandTurck
SGD21.65
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5V dc 700mW SPDT - Plug In 10A 5kV Plug In C10-A10 250V 220V - - 28.8mm
RS Stock No. 842-3824
Mfr. Part No.C9-A41FX/024VDC
BrandTurck
SGD36.69
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units
24V dc 1W 4PDT 594 Ω Plug In 5A 2.5kV Plug In C9-A41 250V 110V - 4 21mm
RS Stock No. 842-3622
Mfr. Part No.C3-A30FX/024VDC
BrandTurck
SGD62.12
Each
units
24V dc 1.3W 3PDT 433 Ω Plug In 10A 2.5kV Plug In C3-A30 250V 220V - - 35mm
RS Stock No. 842-3600
Mfr. Part No.C3-A30/024VDC
BrandTurck
SGD44.17
Each
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24V dc 1.3W 3PDT 433 Ω Plug In 10A 2.5kV Plug In C3-A30 250V 220V - - 35mm
RS Stock No. 842-3827
Mfr. Part No.C9-A41DX/024VDC
BrandTurck
SGD37.01
Each
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24V dc 1W 4PDT 594 Ω Plug In 5A 2.5kV Plug In C9-A41 250V 110V - 4 21mm
RS Stock No. 842-3530
Mfr. Part No.C2-A20FX/032VDC
BrandTurck
SGD46.50
Each
units
32V dc 1.3W DPDT - Plug In 10A 2.5kV Plug In C2-A20 250V 220V - - 35mm
RS Stock No. 842-3802
Mfr. Part No.C7-A20X/024VAC
BrandTurck
SGD32.26
Each
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24V ac 1.2W DPDT 174 Ω Plug In 10A 2.5kV Plug In C7-A20 250V 220V - - 21mm
RS Stock No. 842-3818
Mfr. Part No.C7-T21DX/024VDC
BrandTurck
SGD34.90
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units
24V dc 1W DPDT 594 Ω Plug In 6A 2.5kV Plug In C7-T21 250V 30V - - 21mm
RS Stock No. 842-3467
Mfr. Part No.C10-A10X/240VAC
BrandTurck
SGD31.23
Each
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240V ac 1.1W SPDT 28.8 kΩ Plug In 10A 5kV Plug In C2-A20 250V 220V - - 28.8mm
RS Stock No. 842-3836
Mfr. Part No.C9-A41X/024VAC
BrandTurck
SGD34.20
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24V ac 1.2W 4PDT 174 Ω Plug In 5A 2.5kV Plug In C9-A41 250V 110V - 4 21mm
RS Stock No. 842-3634
Mfr. Part No.C3-A30FX/120-125VDC
BrandTurck
SGD59.48
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125V dc 1.3W 3PDT - Plug In 10A 2.5kV Plug In C3-A30 250V 220V - - 35mm
RS Stock No. 842-3735
Mfr. Part No.C4-A40X/120-125VDC
BrandTurck
SGD55.54
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125V dc 1.4W 4PDT - Plug In 6A 2.5kV Plug In C4-A40 250V 220V - - 35mm
RS Stock No. 842-3811
Mfr. Part No.C7-A20X/024VDC
BrandTurck
SGD31.23
Each
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24V dc 1W DPDT 594 Ω Plug In 10A 2.5kV Plug In C7-A20 250V 220V - - 21mm
RS Stock No. 842-3798
Mfr. Part No.C7-A20DX/024VDC
BrandTurck
SGD34.72
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24V dc 1W DPDT 594 Ω Plug In 10A 2.5kV Plug In C7-A20 250V 220V - - 21mm
RS Stock No. 842-3773
Mfr. Part No.C5-A30X/110VDC
BrandTurck
SGD40.84
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110V dc 1.4W 3PDT 8.1 kΩ Plug In 16A 4kV Plug In C5-A30 250V 220V - - 35mm
RS Stock No. 842-3414
Mfr. Part No.C10-A10BX/024UC
BrandTurck
SGD25.01
Each
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24V ac 1.1W SPDT 290 Ω Plug In 10A 5kV Plug In C10-A10 250V 220V - - 28.8mm
RS Stock No. 842-3537
Mfr. Part No.C2-A20FX/120-125VDC
BrandTurck
SGD48.62
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125V dc 1.3W DPDT 9.2 kΩ Plug In 10A 2.5kV Plug In C2-A20 250V 220V - - 35mm
RS Stock No. 842-3776
Mfr. Part No.C5-A30X/012VDC
BrandTurck
SGD38.00
Each
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12V dc 1.4W 3PDT - Plug In 16A 4kV Plug In C5-A30 250V 220V - - 35mm
RS Stock No. 842-3779
Mfr. Part No.C5-A30X/024VDC
BrandTurck
SGD38.00
Each
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24V dc 1.4W 3PDT 414 Ω Plug In 16A 4kV Plug In C5-A30 250V 220V - - 35mm
RS Stock No. 842-3726
Mfr. Part No.C4-A40DX/120-125VDC
BrandTurck
SGD61.92
Each
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125V dc 1.4W 4PDT - Plug In 6A 2.5kV Plug In C4-A40 250V 220V - - 35mm