Siemens 6SE6400-4BD12-0BA0 Soft Starter Module

Siemens 6SE6400-4BD12-0BA0 is a braking resistor module designed for the MICROMASTER 4 drive family, built to absorb deceleration energy and protect the drive’s DC bus from overvoltage during motor braking. It provides 4000 W of braking power, enabling controlled, reliable slows for high-inertia loads commonly driven by MICROMASTER 4 controllers such as conveyors, pumps, and fans. As a dedicated braking accessory, it integrates into the drive’s braking circuit to dissipate energy generated when the motor is slowed or stopped, helping to maintain smooth operation and reduce electrical stress on the drive. This Siemens part is typically used as a replacement or service component within existing MICROMASTER 4 installations, offering an officially supported solution for sustained braking performance. When selecting a braking resistor for MICROMASTER 4 systems, the 6SE6400-4BD12-0BA0 provides an approved option that aligns with Siemens' drive architecture and braking-control practices. Manufacturers and service providers often specify it when upgrading legacy MICROMASTER 4 systems to maintain braking performance without overloading the drive.