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. 842-3436
Mfr. Part No.C10-A10X/005VDC
BrandTurck
$22.13
Each
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5 V dc 700mW SPDT - Plug In 10A 5kV - Plug In C10-A10 250V 220V - -
RS Stock No. 842-3802
Mfr. Part No.C7-A20X/024VAC
BrandTurck
$38.15
Each
units
24 V ac 1.2W DPDT 174 Ω Plug In 10A 2.5kV - Plug In C7-A20 250V 220V - -
RS Stock No. 842-3420
Mfr. Part No.C10-A10FX/024VDC
BrandTurck
$26.87
Each
units
24 V dc 700mW SPDT 742 Ω Plug In 10A 5kV - Plug In C10-A10 250V 220V - -
RS Stock No. 842-3808
Mfr. Part No.C7-A20FX/024VDC
BrandTurck
$51.74
Each
units
24 V dc 1W DPDT 594 Ω Plug In 10A 2.5kV - Plug In C7-A20 250V 220V - -
RS Stock No. 842-3628
Mfr. Part No.C3-A30DX/240VDC
BrandTurck
$70.69
Each
units
240 V dc 1.3W 3PDT - Plug In 10A 2.5kV - Plug In C3-A30 250V 220V - -
RS Stock No. 842-3619
Mfr. Part No.C3-A30/120VAC
BrandTurck
$52.73
Each
units
120 V ac 2.2W 3PDT 1.7 kΩ Plug In 10A 2.5kV - Plug In C3-A30 250V 220V - -
RS Stock No. 842-3451
Mfr. Part No.C10-A10X/024VDC
BrandTurck
$26.93
Each
units
24 V dc 700mW SPDT 742 Ω Plug In 10A 5kV - Plug In C10-A10 250V 220V - -
RS Stock No. 842-3631
Mfr. Part No.C3-A30FX/048VDC
BrandTurck
$65.08
Each
units
48 V dc 1.3W 3PDT 1.8 kΩ Plug In 10A 2.5kV - Plug In C3-A30 250V 220V - -
RS Stock No. 842-3653
Mfr. Part No.C3-A30X/024VDC
BrandTurck
$61.71
Each
units
24 V dc 1.3W 3PDT 433 Ω Plug In 10A 2.5kV - Plug In C3-A30 250V 220V - -
RS Stock No. 842-3811
Mfr. Part No.C7-A20X/024VDC
BrandTurck
$38.15
Each
units
24 V dc 1W DPDT 594 Ω Plug In 10A 2.5kV - Plug In C7-A20 250V 220V - -
RS Stock No. 842-3622
Mfr. Part No.C3-A30FX/024VDC
BrandTurck
$76.40
Each
units
24 V dc 1.3W 3PDT 433 Ω Plug In 10A 2.5kV - Plug In C3-A30 250V 220V - -
RS Stock No. 842-3600
Mfr. Part No.C3-A30/024VDC
BrandTurck
$52.73
Each
units
24 V dc 1.3W 3PDT 433 Ω Plug In 10A 2.5kV - Plug In C3-A30 250V 220V - -
RS Stock No. 842-3726
Mfr. Part No.C4-A40DX/120-125VDC
BrandTurck
$76.30
Each
units
125 V dc 1.4W 4PDT - Plug In 6A 2.5kV - Plug In C4-A40 250V 220V - -
RS Stock No. 842-3530
Mfr. Part No.C2-A20FX/032VDC
BrandTurck
$56.10
Each
units
32 V dc 1.3W DPDT - Plug In 10A 2.5kV - Plug In C2-A20 250V 220V - -
RS Stock No. 842-3779
Mfr. Part No.C5-A30X/024VDC
BrandTurck
$47.12
Each
units
24 V dc 1.4W 3PDT 414 Ω Plug In 16A 4kV - Plug In C5-A30 250V 220V - -
RS Stock No. 842-3773
Mfr. Part No.C5-A30X/110VDC
BrandTurck
$59.70
Each
units
110 V dc 1.4W 3PDT 8.1 kΩ Plug In 16A 4kV - Plug In C5-A30 250V 220V - -
RS Stock No. 842-3612
Mfr. Part No.C3-A30D/024VDC
BrandTurck
$39.94
Each
units
24 V dc 1.3W 3PDT 433 Ω Plug In 10A 2.5kV - Plug In C3-A30 250V 220V - -
RS Stock No. 842-3723
Mfr. Part No.C4-A40FX/024VDC
BrandTurck
$77.97
Each
units
24 V dc 1.4W 4PDT 414 Ω Plug In 6A 2.5kV - Plug In C4-A40 250V 220V - -
RS Stock No. 842-3445
Mfr. Part No.C10-A10X/012VAC
BrandTurck
$25.82
Each
units
12 V ac 1.1W SPDT - Plug In 10A 5kV - Plug In C10-A10 250V 220V - -
RS Stock No. 842-3827
Mfr. Part No.C9-A41DX/024VDC
BrandTurck
$44.94
Each
units
24 V dc 1W 4PDT 594 Ω Plug In 5A 2.5kV - Plug In C9-A41 250V 110V - 4