Auxiliary Contacts

Contacts are the conductive pieces of material that form part of an electrically controlled switch. Auxiliary contacts form part of a contactor, which is a type of switch that can be controlled remotely.

Contactors are often used in very high-power circuits, and auxiliary contacts are the last phase of contact, used to reduce the power of the current. They have a lower current rating than regular power contacts, and can be used to de-energise the contactor.

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.

What are auxiliary contacts used for?

One common usage of auxiliary contacts is in push button controllers, where they can be built in to the start button.


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Description Price Number of Contacts Normal State Configuration Range Mounting Style Contact Current Rating Contact Voltage Rating Pole and Throw Configuration Terminal Type Minimum Operating Temperature Maximum Operating Temperature Operating Temperature Range Priced to Clear Series External Dimensions
RS Stock No. 2508108893
Mfr. Part No.3RH1911-1HA13
BrandSiemens
£9.19
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RS Stock No. 2509621353
Mfr. Part No.LA1SK01
£9.12
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RS Stock No. 2508109543
Mfr. Part No.3RH1921-1CD10
BrandSiemens
£5.03
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RS Stock No. 2508636840
Mfr. Part No.1SBN010040R1004
BrandABB
£16.60
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RS Stock No. 2508258373
Mfr. Part No.278427
BrandEaton
£9.72
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RS Stock No. 2508102570
Mfr. Part No.3RH1122-2HB40
BrandSiemens
£35.13
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RS Stock No. 2508368913
Mfr. Part No.3TX4420-2A
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£9.84
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RS Stock No. 2508274123
Mfr. Part No.276420
BrandEaton
£4.43
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RS Stock No. 2509620013
Mfr. Part No.LA1KN22M
£11.70
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RS Stock No. 2508062078
Mfr. Part No.3LD9200-5BF
BrandSiemens
£15.75
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RS Stock No. 2508190457
Mfr. Part No.101371
BrandEaton
£9.72
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RS Stock No. 2508258367
Mfr. Part No.278426
BrandEaton
£9.72
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RS Stock No. 2508369304
Mfr. Part No.3TX4422-2G
BrandSiemens
£28.66
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RS Stock No. 2508062084
Mfr. Part No.3LD9200-5CF
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£15.75
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RS Stock No. 2508256658
Mfr. Part No.276532
BrandEaton
£42.90
1 Pack of 5
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RS Stock No. 2509621369
Mfr. Part No.LA1SK10
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