Eaton SDAINLM115 Star-Delta Starter 55kW 115A 400V AC-3

The Eaton SDAINLM115 Star-Delta Starter is a robust, pre-wired solution engineered for the efficient control and protection of three-phase induction motors in industrial environments. Designed to handle a power rating of 55kW at 400V, this starter facilitates a controlled transition from star to delta connection, which significantly minimizes the high inrush currents typically associated with motor startup. By managing the electrical load during the acceleration phase, it helps maintain system stability and extends the operational lifespan of the motor and connected mechanical components.

Advantages

This star-delta starter offers a streamlined installation process due to its pre-wired configuration, which reduces wiring errors and saves valuable time during panel assembly. The unit is built to high industrial standards, ensuring reliable performance under demanding AC-3 duty cycles. Its compact design allows for efficient use of space within control cabinets, while the integrated components work in harmony to provide consistent motor protection and smooth operational transitions, ultimately contributing to lower mechanical stress and improved energy efficiency in industrial drive systems.

Suitable for

• Industrial ventilation and fan systems
• Large centrifugal pumps
• Conveyor belt drives
• Compressor motor control
• Heavy-duty industrial machinery

When it may not be suitable

This starter is specifically designed for three-phase induction motors and is not suitable for single-phase applications or motors that do not support star-delta starting configurations. It should not be used in environments exceeding its rated current or voltage specifications, as this could lead to equipment failure or safety hazards.

Key specifications

• Power rating: 55kW at 400V
• Rated operational current: 115A (AC-3)
• Configuration: Pre-wired star-delta starter
• Application: Three-phase induction motors

How to use

The Eaton SDAINLM115 should be installed by a qualified electrician within a suitable electrical enclosure. Ensure that the motor terminals are correctly wired for star-delta operation according to the manufacturer's wiring diagram. The device must be connected to a power supply that matches the rated voltage and frequency. Once installed, the timing relay should be adjusted to ensure the transition from star to delta occurs at the appropriate speed for the specific motor load.

What to consider before purchase

• Verify that the motor nameplate data matches the 55kW and 115A ratings.
• Ensure the control cabinet has sufficient space for the physical dimensions of the starter.
• Confirm that the supply voltage is compatible with the coil voltage requirements.
• Check that the motor is configured for six-lead star-delta starting.

Usage recommendations

Regularly inspect the electrical connections for tightness and check the contactors for signs of wear to ensure long-term reliability. Always follow local electrical codes and safety regulations during installation and maintenance.