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. 331-3696
BrandRS PRO
HK$57.74
Each
units
2 NO/NC - DIN Rail Mount - 240 V ac DP - - - - - - -
RS Stock No. 246-4507
Mfr. Part No.3RH1921-1FA22
BrandSiemens
HK$65.45
Each
units
4 2NO/2NC - Front Mount 6 A - 4P Screw - - - 3RH1 - -
RS Stock No. 392-8973
Mfr. Part No.3RH1921-1CA01
BrandSiemens
HK$45.01
Each
units
1 NC Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 394-9914
Mfr. Part No.LADN20
HK$67.66
Each
units
2 2NO TeSys Front Mount 10 A - DP Screw - - - LADN - -
RS Stock No. 272-870
Mfr. Part No.GVAED011
HK$149.18
Each
units
2 NO/NC - Front Mount - - DP - - - - GVAE - -
RS Stock No. 467-5490
Mfr. Part No.1SDA051370R1
BrandABB
HK$597.28
Each
units
1 NO/NC - - - - SPDT - - - - TMAX - -
RS Stock No. 279-6315
Mfr. Part No.LA1KN04
HK$84.50
Each
units
4 4NC - Clip On 10 A 600 V ac 4P Screw - - - LA1K - -
RS Stock No. 521-4591
Mfr. Part No.5ST3012
BrandSiemens
HK$279.36
Each
units
2 2NC Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 → +40 °C 5ST3 - -
RS Stock No. 326-712
Mfr. Part No.11DILE
BrandEaton
HK$84.08
Each
units
2 NO/NC - Front Mount 2.5 A dc, 4 A ac 220 V dc, 500 V ac DPST Screw - - - - - -
RS Stock No. 746-0800
Mfr. Part No.3RH2921-1DA11
BrandSiemens
HK$101.13
Each
units
2 NO/NC Sirius Innovation Lateral 10 A 600 V dc, 690 V ac DP Screw - - -25 → +60 °C 3RH2 - -
RS Stock No. 209-5410
Mfr. Part No.M5723004
BrandMETCASE
HK$574.40
Each
units
- - - - - - - - - - - Mettec 230 x 180 x 50mm 230 mm
RS Stock No. 735-2715
Mfr. Part No.3SB1400-0A
BrandSiemens
HK$135.34
Each
units
2 NO/NC - Front Mount 10 A 220 V dc, 400 V ac DPST Screw -25°C +70°C -25 → +70 °C - - -
RS Stock No. 394-9885
Mfr. Part No.LADN31
HK$165.73
Each
units
4 3NO/NC TeSys Front Mount 10 A - 4P Screw -5°C +60°C - LADN - -
RS Stock No. 791-2852
Mfr. Part No.A9C15419
HK$766.48
Each
units
- - Acti 9 DIN Rail Mount - 12 → 48 V ac - Screw -5°C +50°C -5 → +50 °C iATET - -
RS Stock No. 706-1917
Mfr. Part No.3RV2901-2E
BrandSiemens
HK$85.69
Each
units
2 NO/NC 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. 219-1439
Mfr. Part No.HI11-P1/P3E-SOND
BrandEaton
HK$118.63
Each
units
2 NO/NC - Side Mount 10 A - - - - +50°C - - - -
RS Stock No. 445-8043
Mfr. Part No.1SBN010040R1122 - CA5-22M
BrandABB
HK$328.90
Each
units
4 2NO/2NC - Front Mount 6 A 24 V dc, 230 V ac 4P Screw - - - CA5 - -
RS Stock No. 400-1467
Mfr. Part No.LAD8N11
HK$87.38
Each
units
- - - - - - - - - - - LAD8 - -
RS Stock No. 608-8999
Mfr. Part No.LA1LC012
HK$1,876.16
Each
units
5 4NO/NC - Side Mount - - 5P Screw - - - LA1L - -
RS Stock No. 243-9898
Mfr. Part No.GAC0521
HK$355.78
Each
units
2 NO/NC - Clip On - - DP - - - - GAC0 - -
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