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 Dimensions External Length
RS Stock No. 706-1910
Mfr. Part No.3RV2901-2F
BrandSiemens
HK$85.69
Each
units
2 2NO Sirius Innovation Plug In 1 A dc, 2.5 A ac 60 V dc, 230 V ac DP Cage Clamp -20°C +60°C -20 → +60 °C - - -
RS Stock No. 223-4823
Mfr. Part No.39990702
BrandSocomec
HK$72.92
Each
units
1 NC - - 2.8 A dc, 3 A ac 48 V dc, 400 V ac SP - - - - - - -
RS Stock No. 122-0941
Mfr. Part No.BFC4-13
BrandWEG
HK$99.18
Each
units
4 NO/3NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFC4 - -
RS Stock No. 706-0973
Mfr. Part No.3RH2911-2HA11
BrandSiemens
HK$67.15
Each
units
2 NO/NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac DPST Cage Clamp -25°C +60°C -25 → +60 °C - - -
RS Stock No. 136-3689
Mfr. Part No.3RH2911-2GA04
BrandSiemens
HK$113.14
Each
units
4 4NC Sirius Innovation Snap-On 10 A 600 V dc, 690 V ac 4PST Spring Load -25°C +60°C -25 → +60 °C 3RH29 - -
RS Stock No. 706-0866
Mfr. Part No.3RH2911-1BA10
BrandSiemens
HK$52.62
Each
units
1 NO Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac SPST Screw -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 874-4537
Mfr. Part No.3VA9988-0AA12
BrandSiemens
HK$155.18
Each
units
3 4NO/2NC Sentron Side Mount 6 A - - Screw - - - 3VA - -
RS Stock No. 711-6339
Mfr. Part No.CAT4-11E
BrandABB
HK$107.65
Each
units
2 NO/NC - Front Mount 6 A 600 V dc, 690 V ac DP Screw - - - CAT4 - -
RS Stock No. 706-0992
Mfr. Part No.3RH2911-2HA22
BrandSiemens
HK$113.14
Each
units
4 2NO/2NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 4PST Cage Clamp -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 178-8008
Mfr. Part No.DILA-XHI02
BrandEaton
HK$71.82
Each
units
2 2NC - Surface Mount 4 (AC) A, 10 (DC) A 220 V dc, 500 V ac 2P Screw -25°C +60°C -25 → +60 °C DILA - -
RS Stock No. 776-3957
Mfr. Part No.A9A26897
HK$459.00
Each
units
2 NO/NC Acti 9 DIN Rail Mount 6 A 24 V dc - Cage Clamp -35°C +70°C -35 → +70 °C iOF - -
RS Stock No. 445-8166
Mfr. Part No.GJL1201330R0003 - CAF6-11M
BrandABB
HK$87.52
Each
units
2 NO/NC - Front Mount - 240 V dc, 500 V ac DP Screw - - - B6 - -
RS Stock No. 512-9516
Mfr. Part No.OA3G01
BrandABB
HK$89.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 662-9341
Mfr. Part No.LADN10
HK$106.05
Each
units
1 NO - Front Mount - 690 V ac SP Screw -5°C +60°C -5 → +60 °C LADN - -
RS Stock No. 209-5577
Mfr. Part No.M5725104
BrandMETCASE
HK$817.52
Each
units
- - - - - - - - - - - Mettec 250 x 250 x 85mm 250 mm
RS Stock No. 610-0140
Mfr. Part No.VZ15
HK$203.40
Each
units
- - - Side Mount 63 A - - - - - - VZ15 - -
RS Stock No. 209-5921
Mfr. Part No.M5735317
BrandMETCASE
HK$1,312.61
Each
units
- - - - - - - - - - - Mettec 350 x 263 x 150mm 350 mm
RS Stock No. 209-5628
Mfr. Part No.M5723107
BrandMETCASE
HK$625.09
Each
units
- - - - - - - - - - - - - -
RS Stock No. 493-0630
Mfr. Part No.DILM32-XHI02
BrandEaton
HK$70.13
Each
units
2 2NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DPST Screw - - - DILM - -
RS Stock No. 714-1934
Mfr. Part No.SAUXCO
HK$129.50
Each
units
2 NO/NC - Side Mount - - DP Screw - - - - - -
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