3RT1275-6AF36

The 3RT1275-6AF36 is a Siemens SIRIUS 3RT12 vacuum contactor with an S12 frame, AC-3 rated current of 400A, corresponding to a power of approximately 200kW. It is equipped with a 110-127V AC/DC operating coil, and comes standard with 2NO+2NC contacts and busbar wiring. It has a mechanical life of approximately ten million cycles and is suitable for large motor control.

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Siemens 3RT1275-6AF36 vacuum contactor, 110-127V coil S12

Product Positioning

The 3RT1275-6AF36 belongs to the SIRIUS 3RT12 series S12 frame vacuum contactor, featuring a vacuum arc-extinguishing structure to meet the demands of high-current, high-frequency switching. This model is specially equipped with a 110-127V AC/DC operating coil for easy connection to common low-voltage control power supply systems in North America. Kenxin Motors is an authorized Siemens distributor, providing genuine products and comprehensive after-sales service.

Core Product Advantages and Features

Vacuum interrupter design

Vacuum tube arc quenching replaces the traditional air-based structure, reducing arc sputtering and extending switching life.

110-127V AC/DC coil

The operating coil is compatible with 110-127V AC/DC power supplies, suitable for applications requiring US standards or 110V control systems.

AC-3 rated current 400A

The S12 large frame design corresponds to approximately 200kW of power at 400V, which is sufficient to drive large motor loads.

2NO+2NC auxiliary contacts

Four sets of auxiliary contacts facilitate interlocking protection, status feedback, and series connection with control circuits.

High mechanical life

The mechanical operating life can reach tens of millions of cycles, making it suitable for production line applications with high-frequency start-stop cycles.

Busbar type main circuit terminal

The main circuit uses busbar connections, paired with screw-type auxiliary terminals, which facilitates wiring and integration with the panel.

project	Specification
Product Type	SIRIUS 3RT12 Series Vacuum Contactors
Applicable base	S12
Rated current (AC-3)	400 A
Rated power (400V AC-3)	Approximately 200 kW
Operating coil voltage	110 - 127 V AC/DC
Extreme number	3 poles
Auxiliary contacts	2NO + 2NC
Main circuit wiring method	Busbar
External dimensions (height x width x depth)	Approximately 210 x 145 x 206 mm
Operating frequency	50/60 Hz
Mechanical life	Approximately 10 million operations
Protection level	IP00 / IP20

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