3RT1075-6AF30

The Siemens SIRIUS S12 large contactor has a main circuit rated current of 400A (approximately 200kW for AC-3) and a coil voltage of 110-127V (AC/DC universal). It features a 3-pole main contact with 2 normally open and 2 normally closed auxiliary contacts. Suitable for starting and stopping large motors and high-current circuits in distribution panels, Kenxin Motor is an authorized distributor and can assist in verifying coil specifications.

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Siemens SIRIUS 3RT1075-6AF30 large power contactor actual photo

Product Positioning

The 3RT1075-6AF30 belongs to the Siemens SIRIUS 3RT10 series S12 frame large power contactor, suitable for direct starting and stopping of large three-phase motors and switching of high-current circuits in distribution panels. This specification has a coil voltage of 110-127V AC/DC, and features 3-pole main contacts and built-in auxiliary contacts. It boasts a robust structure, long switching life, and is suitable for maintenance and replacement in factory power panels and large mechanical equipment.

Core Product Advantages and Features

S12 large frame design

The main circuit has a rated current of 400A, and the AC-3 is approximately 200kW/400V, which is sufficient to handle the high inrush current of large motors during direct starting.

110-127V coil universal design

AF coil codes correspond to 110-127V AC/DC, suitable for control voltages in most industrial switchboards.

Built-in 2NO2NC auxiliary contacts

In addition to the 3-pole main contacts, two normally open and two normally closed auxiliary contacts are configured to facilitate linkage with indicator lights, PLC signals, or interlocking circuits.

Busbar main circuit terminals

The main circuit uses a bus terminal design, suitable for high-current wiring, while the auxiliary/control circuits use screw terminals.

Siemens original quality

Compliant with IEC 60947-4-1 standard, with a mechanical life of tens of millions of cycles, ensuring stable and reliable long-term operation.

project	Specification
Base size	S12
Rated operating current AC-1	430 A (400V, 40°C)
Rated operating current/power AC-3	400 A / approximately 200 kW (400V AC)
Extreme number	3 poles, 3 sets of normally open main contacts
Built-in auxiliary contacts	2 normally open + 2 normally closed (2 NO + 2 NC)
Coil voltage code	AF: 110-127V AC/DC
Rated insulation voltage	1000 V AC
External dimensions (height x width x depth)	Approximately 214 x 160 x 225 mm
Main circuit terminals	Busbar (BAR) terminals
Auxiliary/control terminals	Screw terminals
Applicable Standards	IEC 60947-4-1
Remark	The differences in terminals/mechanisms between version 30 and version 36 of the same frame are not clearly stated in the publicly available catalog; please refer to the product nameplate for accuracy.

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3RT1075-6AB36

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3RT1075-6A

The Siemens SIRIUS S12 large contactor series 3RT1075-6A has a main circuit rated current of 400A and an AC-3 rated current of approximately 200kW. It covers various coil voltage versions and features a 3-pole main contact with 2 normally open and 2 normally closed auxiliary contacts. Kenxin Motor can assist in confirming the required coil voltage and procure the corresponding complete part number on your behalf.