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. 121-6871
BrandRS PRO
$22.20
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C AR - -
RS Stock No. 121-6875
BrandRS PRO
$6.25
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C MSK - -
RS Stock No. 466-295
BrandRS PRO
$7.31
Each
units
1 NO/NC - Panel Mount 63 A - SPDT - - - - - - -
RS Stock No. 121-6865
BrandRS PRO
$8.07
Each
units
1 NO - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C HSV - -
RS Stock No. 331-3696
BrandRS PRO
$26.28
Each
units
2 NO/NC - DIN Rail Mount - 240 V ac DP - - - - - - -
RS Stock No. 121-6870
BrandRS PRO
$22.43
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C UR - -
RS Stock No. 121-6868
BrandRS PRO
$9.32
Each
units
1 NC - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C HRS - -
RS Stock No. 121-6874
BrandRS PRO
$5.47
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C MSK - -
RS Stock No. 121-6869
BrandRS PRO
$22.20
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C UR - -
RS Stock No. 121-6866
BrandRS PRO
$8.14
Each
units
1 NC - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C HSV - -
RS Stock No. 121-6873
BrandRS PRO
$5.04
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C MSK - -
RS Stock No. 121-6867
BrandRS PRO
$9.32
Each
units
1 NO - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C HRS - -
RS Stock No. 121-6872
BrandRS PRO
$19.20
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C AR - -
RS Stock No. 706-0905
Mfr. Part No.3RH2911-1HA11
BrandSiemens
$28.65
Each
units
2 NO/NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac DPST Screw -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 758-478
Mfr. Part No.K1 H010/A11-VE
$46.12
Each
units
2 NO/NC - - 40 A, 63 A - DP - - - - - - -
RS Stock No. 209-5785
Mfr. Part No.M5735204
BrandMETCASE
$213.99
Each
units
- - - - - - - - - - - Mettec 350 x 250 x 120mm 350 mm
RS Stock No. 800-7286
Mfr. Part No.1SFN010820R1011
BrandABB
$42.08
Each
units
4 NC, NO - Side Mount 6 A 690 V ac DP Screw - - - CAL19 - -
RS Stock No. 521-4579
Mfr. Part No.5ST3010
BrandSiemens
$56.11
Each
units
2 NO/NC Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 → +40 °C 5ST3 - -
RS Stock No. 751-5751
Mfr. Part No.3RT1926-2FJ31
BrandSiemens
$157.23
Each
units
2 NO/NC Sirius Classic - 20 mA - - Screw -25°C +60°C -25 → +60 °C 3RT1 - -
RS Stock No. 800-7295
Mfr. Part No.1SFN010820R3311
BrandABB
$42.76
Each
units
4 NC, NO - Side Mount 6 A 690 V ac DP Screw - - - CAL19 - -
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