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 External Width External Dimensions
RS Stock No. 482-4434
Mfr. Part No.1SCA022353R4970
BrandABB
TWD362.00
Each
units
1 1NO - - - - - - - - - - - -
RS Stock No. 445-8043
Mfr. Part No.1SBN010040R1122 - CA5-22M
BrandABB
TWD1,212.00
Each
units
4 2NO/2NC - Front Mount 6 A 24 V dc, 230 V ac 4P Screw - - - CA5 - -
RS Stock No. 488-7384
Mfr. Part No.2CDS200912R0001
BrandABB
TWD859.00
Each
units
2 NO/NC - Side Mount - - DP Screw - - - - - -
RS Stock No. 460-1506
Mfr. Part No.GHS2701916R0003 - S2-H02
BrandABB
TWD822.00
Each
units
2 2NC - Side Mount 4 A dc, 6 A ac 24 V dc, 230 V ac DP - - - - HSMS - -
RS Stock No. 711-6341
Mfr. Part No.CAT4-11U
BrandABB
TWD417.00
Each
units
2 NO/NC - Front Mount 6 A 600 V dc, 690 V ac DP Screw - - - CAT4 - -
RS Stock No. 711-6348
Mfr. Part No.CAT4-11M
BrandABB
TWD417.00
Each
units
2 NO/NC - Front Mount 6 A 600 V dc, 690 V ac DP Screw -40°C +70°C -40 → +70 °C CAT4 - -
New
RS Stock No. 211-1475
Mfr. Part No.1SAE901901R1011
BrandABB
TWD1,098.00
Each
units
1 NO/NC ABB Side 6 A 500 V AC - - - - - EH04-11N - -
RS Stock No. 183-3782
Mfr. Part No.359624
BrandABB
TWD1,319.00
Each
units
2 1NO/1NC - DIN Rail Mount 10 A 24 V ac/dc - - - - - S2C - -
RS Stock No. 194-6338
Mfr. Part No.1SBN010013R1010
BrandABB
TWD1,195.00
Each
units
1 1NO - Front Mount 6 A 127 V ac - Screw - - - - - -
RS Stock No. 445-0415
Mfr. Part No.1SAM201901R1001
BrandABB
TWD320.00
Each
units
2 NO/NC - Front Mount 1 A dc, 3 A ac 220 V dc, 230 V ac DP - - - - HK1 - -
RS Stock No. 727-1549
Mfr. Part No.1SCA022353R4890
BrandABB
TWD345.00
Each
units
1 NC - Snap-On 6 A ac, 10 A dc 400 V dc, 690 V ac SP Screw - - - OA1G - -
RS Stock No. 800-7295
Mfr. Part No.1SFN010820R3311
BrandABB
TWD782.00
Each
units
4 2NO/2NC - Side Mount 6 A 690 V ac DP Screw - - - CAL19 - -
RS Stock No. 831-9191
Mfr. Part No.1SDA066423R1
BrandABB
TWD888.00
Each
units
1 1CO - - - 24 V dc - - - - - XT1 - -
RS Stock No. 711-6395
Mfr. Part No.CA4-13N
BrandABB
TWD691.00
Each
units
4 NO/3NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw -40°C +70°C -40 → +70 °C CA4 - -
RS Stock No. 467-5490
Mfr. Part No.1SDA051370R1
BrandABB
TWD2,315.00
Each
units
1 NO/NC - - - - SPDT - - - - TMAX - -
New
RS Stock No. 211-1476
Mfr. Part No.1SAE901901R1020
BrandABB
TWD1,098.00
Each
units
2 2NO/0NC ABB Side 6 A 500 V - - - - - EH04-20N - -
RS Stock No. 512-9493
Mfr. Part No.OA4B10
BrandABB
TWD706.00
Each
units
1 NO - Snap-On - - SP - - - - - - -
RS Stock No. 456-0253
Mfr. Part No.1SBN010020R1011
BrandABB
TWD582.00
Each
units
2 NO/NC - Side Mount - - DP Screw - - - CAL5 - -
RS Stock No. 460-1499
Mfr. Part No.GHS2701916R0002 - S2-H20
BrandABB
TWD740.00
Each
units
2 2NO - Side Mount 4 A dc, 6 A ac 24 V dc, 230 V ac DP - - - - HSMS - -
RS Stock No. 445-8093
Mfr. Part No.GHE3401321R0001
BrandABB
TWD967.00
Each
units
2 2NO - DIN Rail Mount 4 A 220 V dc, 400 V ac DP Screw -25°C +55°C -25 → +55 °C ESB - -