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 Series Bluetooth External Dimensions
RS Stock No. 711-6341
Mfr. Part No.CAT4-11U
BrandABB
$21.62
Each
units
2 NO/NC - Front Mount 6 A 600 V dc, 690 V ac DP Screw - - - CAT4 - -
RS Stock No. 482-4434
Mfr. Part No.1SCA022353R4970
BrandABB
$16.69
Each
units
1 NO - - - - - - - - - - - -
RS Stock No. 818-283
Mfr. Part No.NHI21-PKZ0
BrandEaton
$43.08
Each
units
3 2NO/NC - Side Mount 2 A dc, 3.5 A ac 220 V dc, 500 V ac 3PST Screw - - - - - -
RS Stock No. 445-0421
Mfr. Part No.1SAM201902R1001
BrandABB
$18.87
Each
units
2 NO/NC - Side Mount 2 A dc, 6 A ac 220 V dc, 400 V ac DP - - - - HK1 - -
RS Stock No. 445-8043
Mfr. Part No.1SBN010040R1122 - CA5-22M
BrandABB
$66.06
Each
units
4 2NO/2NC - Front Mount 6 A 24 V dc, 230 V ac 4P Screw - - - CA5 - -
RS Stock No. 818-277
Mfr. Part No.NHI11-PKZ0
BrandEaton
$24.51
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. 394-9885
Mfr. Part No.LADN31
$106.66
Each
units
4 3NO/NC TeSys Front Mount 10 A - 4P Screw -5°C +60°C - LADN - -
RS Stock No. 262-0971
Mfr. Part No.LA1SK20
$22.17
Each
units
2 2NO - Clip On - - DP Screw - - - LA1S - -
RS Stock No. 831-9191
Mfr. Part No.1SDA066423R1
BrandABB
$46.00
Each
units
1 CO - - - 24 V dc - - - - - XT1 - -
RS Stock No. 746-0705
Mfr. Part No.3RH1921-1HA22
BrandSiemens
$101.24
Each
units
4 2NO/2NC Sirius Classic Snap Front - - 4P Screw - - - 3RH1 - -
RS Stock No. 209-5921
Mfr. Part No.M5735317
BrandMETCASE
$211.16
Each
units
- - - - - - - - - - - Mettec - 350 x 263 x 150mm
RS Stock No. 413-1675
Mfr. Part No.GVAE203
$77.70
Each
units
2 2NO - Front Mount - 60 V dc, 240 V ac DP - - - - GVAE - -
RS Stock No. 257-3673
Mfr. Part No.VZ02
$17.47
Each
units
1 - - Side Mount 10 A 690 V ac SP Screw -20°C +50°C -20 → +50 °C VZ02 - -
RS Stock No. 257-3689
Mfr. Part No.VZ01
$19.67
Each
units
1 - - Side Mount 16 A 690 V ac SP Screw -20°C +50°C -20 → +50 °C VZ01 - -
RS Stock No. 706-0920
Mfr. Part No.3RH2911-1HA21
BrandSiemens
$19.94
Each
units
3 2NO/NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 3PST Screw -25°C +60°C -25 → +60 °C - - -
RS Stock No. 257-3774
Mfr. Part No.VZ12
$43.44
Each
units
- - - Side Mount 63 A - - - - - - VZ12 - -
RS Stock No. 363-5744
Mfr. Part No.LA1KN313
$30.79
Each
units
4 3NO/NC - Clip On 10 A 600 V ac 4P Cage Clamp - - - LA1K - -
RS Stock No. 124-3132
Mfr. Part No.5ST3031
BrandSiemens
$88.26
Each
units
- - Sentron - - - - - - - - 5ST3 - -
RS Stock No. 445-0459
Mfr. Part No.1SAM201902R1003
BrandABB
$21.69
Each
units
2 2NC - Side Mount 2 A dc, 6 A ac 220 V dc, 400 V ac DP - - - - HK1 - -
RS Stock No. 706-0923
Mfr. Part No.3RH2911-1HA22
BrandSiemens
$24.83
Each
units
4 2NO/2NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac 4PST Screw -25°C +60°C -25 → +60 °C 3RH2 - -
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