Auxiliary Contacts

Auxiliary contacts, also known as auxiliary contactors are electromechanical devices used in conjunction with primary switching equipment such as contactors, circuit breakers, switches, and relays. These secondary switching devices are physically connected to the main switching equipment and work at the same time. The add-on accessories are available in a range of contact configurations and mounting styles to suit a wide range of industrial control applications.RS Components offer an extensive range of high-quality auxiliary contact blocks from industry-leading brands including Schneider Electric, Siemens, ABB, Lovato, Eaton, and of course RS Pro.

How do auxiliary contacts work?

Auxiliary contacts are affixed to the main contacts and change state when the main contacts do. They pass the data from the circuit to a logic controller, which in turn gives instructions to the linked devices about whether to turn on or off. Alternatively, they can be used as a standalone hardware control unit. Auxiliary contacts are available in a variety of mounting styles such as a front mount or DIN rail mount and a range of terminal types including screw terminals, screw clamp terminals, and cage clamp terminals making it easy to find the right contact for the application.

What are auxiliary contacts used for?

One common usage of auxiliary contacts is in push-button controllers, where they can be built into the start button. They are a common component in relay logic circuits solid-state electronics, electric motors, motor control schemes, and other industrial control applications.

What are the different types of contact blocks?

There are two types of contact, contacts that are closed in a non-activated state and those that are open. They will be described as N/C (normally closed) and N/O (normally open).NC contacts are used as interlocks. NO contacts are used for switching on other components such as status indication lamps.


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Description Price Number of Contacts Normal State Configuration Range Mounting Style Contact Current Rating Contact Voltage Rating Series Pole and Throw Configuration Terminal Type Minimum Operating Temperature Maximum Operating Temperature Operating Temperature Range
RS Stock No. 482-4434
Mfr. Part No.OA1G10 1SCA022353R4970
BrandABB
TWD403.00
Each
units
1 1NO - - - - - - - - - -
RS Stock No. 818-277
Mfr. Part No.072896 & NHI11-PKZ0
BrandEaton
TWD503.00
Each
units
2 NO/NC - Side Mount 2 A dc, 3.5 A ac 220 V dc, 500 V ac - DPST Screw - - -
RS Stock No. 394-9879
Mfr. Part No.LADN40
TWD598.00
Each
units
4 4NO TeSys Front Mount 10 A - LADN 4P Screw - - -
RS Stock No. 333-546
Mfr. Part No.78819020 & HI11-P1/P3Z(RS333-546)
BrandEaton
TWD529.00
Each
units
2 NO/NC - Side Mount 10 A - - - Screw - +50°C -
RS Stock No. 124-3131
Mfr. Part No.5ST3030
BrandSiemens
TWD1,523.00
Each
units
- - SENTRON - - - 5ST3 - - - - -
RS Stock No. 400-1473
Mfr. Part No.LAD8N20
TWD626.00
Each
units
- 2NO - Side - - LAD8 - Screw Clamp - - -
RS Stock No. 394-9914
Mfr. Part No.LADN20
TWD490.00
Each
units
2 2NO TeSys Front Mount 10 A - LADN DP Screw - - -
RS Stock No. 706-0911
Mfr. Part No.3RH2911-1HA20
BrandSiemens
TWD387.00
Each
units
2 2NO Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 3RH2 DPST Screw -25°C +60°C -25 → +60 °C
RS Stock No. 395-0100
Mfr. Part No.GVAN20
TWD1,196.00
Each
units
2 2NO - Side Mount - 240 V dc, 690 V ac GVAN DP Screw - - -
RS Stock No. 445-8043
Mfr. Part No.1SBN010040R1122 - CA5-22M
BrandABB
TWD1,274.00
Each
units
4 2NO/2NC - Front Mount 6 A 24 V dc, 230 V ac CA5 4P Screw - - -
RS Stock No. 244-0107
Mfr. Part No.082882 & NHI-E-11-PKZ0
BrandEaton
TWD452.00
Each
units
2 NO/NC - Front Mount 1 A ac, 2 A dc 24 V dc, 240 V ac - DPST Screw - - -
RS Stock No. 395-0122
Mfr. Part No.GVAN11
TWD347.00
Each
units
2 NO/NC TeSys Side Mount 6 A 240 V dc, 690 V ac GVAN DP Screw - - -
RS Stock No. 395-0144
Mfr. Part No.GVAE11
TWD339.00
Each
units
2 NO/NC TeSys Front Mount 2.5 A 60 V dc, 240 V ac GVAE DP Screw - - -
RS Stock No. 392-8967
Mfr. Part No.3RH1921-1CA10
BrandSiemens
TWD152.00
Each
units
1 NO Sirius Classic Snap-On - - 3RH1 SP Screw - - -
RS Stock No. 121-6867
BrandRS PRO
TWD217.00
Each
units
1 1NO - DIN Rail Mount - - HRS - Screw -25°C +60°C -25 → +60 °C
RS Stock No. 492-1692
Mfr. Part No.082884 & NHI-E-10-PKZ0
BrandEaton
TWD349.00
Each
units
1 NO - Front Mount 1 A ac, 2 A dc 110 V dc, 240 V ac - SPST Screw - - -
RS Stock No. 394-9936
Mfr. Part No.LADN11
TWD378.00
Each
units
2 NO/NC TeSys Front Mount 10 A - LADN DP Screw - - -5 → +60 °C
RS Stock No. 121-6868
BrandRS PRO
TWD217.00
Each
units
1 1NC - DIN Rail Mount - - HRS - Screw -25°C +60°C -25 → +60 °C
RS Stock No. 776-2963
Mfr. Part No.A9N26929
TWD4,190.00
Each
units
2 CO Acti 9 DIN Rail Mount 6 A ac, 6 A dc 130 V dc, 415 V ac iC60 DPDT Clamp -37°C +70°C -37 → +70 °C
RS Stock No. 488-7384
Mfr. Part No.2CDS200912R0001 S2C-H6R
BrandABB
TWD952.00
Each
units
2 NO/NC - Side Mount - - - DP Screw - - -