3RT1055-1LA06

The 3RT1055-1LA06 is the body of the Siemens SIRIUS 3RT10 series S6 large three-pole contactor. It has an AC-3 rated current of 150A and a rated power of 75kW (400V). The operating coil and auxiliary contacts are not included in the shipment. Corresponding coils and accessory modules can be selected separately according to the actual control voltage requirements.

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Image of Siemens 3RT1055-1LA06 SIRIUS contactor body

Product Positioning

The 3RT1055-1LA06 is the main unit version of the Siemens SIRIUS 3RT10 large contactor series. Its three-pole main contacts can handle heavy load switching of AC-3 rated 150A, 75kW. It does not include the operating coil or auxiliary contact module at the factory. Users can separately add corresponding coils and auxiliary contacts according to the actual control voltage and circuit requirements, making it suitable for customized switchboard assembly and spare parts planning.

Core Product Advantages and Features

S6 Large Tripolar Body

The main contacts AC-3 are rated at 150A and 75kW (400V), providing the same heavy-load switching capability as the full version.

Without operating coil

The product does not include a coil at the factory; however, a matching coil can be selected based on the actual control voltage on site, making procurement more flexible.

No auxiliary contacts

The required normally open or normally closed auxiliary contact modules can be added separately, and the configuration can be flexibly adjusted according to the control circuit requirements.

Suitable for customized assembly

This allows switchboard manufacturers or maintenance units to easily select and match coils and accessories according to project specifications.

Sturdy and durable structure

The mechanism is designed to withstand long-term, high-frequency operation and has excellent operational stability.

Kenxin Motor Selection Consulting

We provide original manufacturer authorized sources and assist customers in selecting compatible coils and auxiliary contact modules.

project	Specification
brand	Siemens
series	SIRIUS 3RT10
model	3RT1055-1LA06
Case size	S6
Extreme number	3-pole (3P)
AC-3 rated current	150 A (400V)
AC-3 rated power	75 kW (400V)
Factory configuration	No operating coil, no auxiliary contacts
Maximum operating frequency (AC-3)	750 times/hour
External dimensions (height × width × depth)	Approximately 172×120×170 mm
Mechanical life	Approximately 10 million times
Thermal short-time current	Approximately 1,300 A
Ambient temperature	-25℃ to +60℃

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