Siemens 6SE7021-6ES87-2DA1 Masterdrives Braking Unit is a 10 kW external brake chopper module for SIMOVERT Masterdrives, compatible with Micromaster 440 Inverters in the FX and GX size families. It is designed to operate on a 510–650 V DC bus and carries IP20 protection, making it suitable for industrial environments. The unit measures 540 × 360 × 145 mm and uses Siemens' compact-plus construction, delivering a compact, field-serviceable braking solution. In typical installations, it is paired with an external braking resistor (for example, 6SE7021-6ES87-2DC0) to complete the braking circuit and safely dissipate energy during deceleration.
