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. 413-1675
Mfr. Part No.GVAE203
HK$105.82
Each
units
2 2NO - Front Mount - 60 V dc, 240 V ac DP - - - - GVAE - -
RS Stock No. 608-9009
Mfr. Part No.LA1LC025
HK$1,681.68
Each
units
4 2NO/2NC, 3NO/NC - Side Mount - - 4P Screw - - - LA1L - -
RS Stock No. 121-6869
BrandRS PRO
HK$110.53
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C UR - -
RS Stock No. 209-5713
Mfr. Part No.M5723204
BrandMETCASE
HK$768.31
Each
units
- - - - - - - - - - - - - -
RS Stock No. 243-7533
Mfr. Part No.3RH1911-1FA22
BrandSiemens
HK$101.36
Each
units
4 2NO/2NC Sirius Classic Snap-On 6 A - 4P Screw - - - 3RH1 - -
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. 482-477
Mfr. Part No.DF14AM2
HK$142.66
Each
units
2 - - DIN Rail Mount 50 A - DP - - - - DF14 - -
RS Stock No. 746-0711
Mfr. Part No.3RH1921-1LA11
BrandSiemens
HK$110.40
Each
units
2 NO/NC Sirius Classic Snap Front - - DP Screw - - - 3RH1 - -
RS Stock No. 751-5717
Mfr. Part No.3RT1916-2EC21
BrandSiemens
HK$578.98
Each
units
2 NO/NC Sirius Classic - - - - Screw -25°C +60°C -25 +60 °C 3RT1 - -
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. 209-5606
Mfr. Part No.M5716107
BrandMETCASE
HK$566.51
Each
units
- - - - - - - - - - - Mettec 160 x 130 x 85mm 160 mm
RS Stock No. 122-1056
Mfr. Part No.BFB-04 EN
BrandWEG
HK$115.77
Each
units
4 4NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFB - -
RS Stock No. 711-6310
Mfr. Part No.1SBN010120R1011
BrandABB
HK$96.55
Each
units
2 NO/NC - Side Mount 6 A 600 V dc, 690 V ac DP Screw -40°C +70°C -40 +70 °C CAL4-11 - -
RS Stock No. 493-0624
Mfr. Part No.DILM32-XHI11
BrandEaton
HK$59.06
Each
units
2 NO/NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DPST Screw - - - DILM - -
RS Stock No. 608-7889
Mfr. Part No.GS1AN22
HK$743.60
Each
units
4 2NO/2NC - Front Mount, Side Mount 1.25 kA - 4P - - - - GS1A - -
RS Stock No. 178-8008
Mfr. Part No.DILA-XHI02
BrandEaton
HK$68.07
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. 136-3696
Mfr. Part No.3RH2911-4DA11
BrandSiemens
HK$101.13
Each
units
2 NO/NC Sirius Innovation Snap-On 10 A 600 V dc, 690 V ac DPST Ring Cable -25°C +60°C -25 → +60 °C 3RH29 - -
RS Stock No. 122-0939
Mfr. Part No.BFC4-04
BrandWEG
HK$100.33
Each
units
4 4NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFC4 - -
RS Stock No. 363-5700
Mfr. Part No.LA1KN203
HK$88.09
Each
units
2 2NO - Clip On 10 A 600 V ac DP Cage Clamp - - - LA1K - -
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