MP9-21451K Rev.F EC Capacitor — 3×349μF, 500VAC / 900VDC, for ABB Converters

The MP9-21451K Rev.F is a high-reliability, industrial-grade electrolytic capacitor module designed specifically for demanding power conversion applications. It consists of three parallel-connected, hermetically sealed, wet aluminum electrolytic capacitors (3 × 349 μF), offering a total nominal capacitance of 1047 μF. Rated for continuous operation at 500 VAC (50/60 Hz) and up to 900 VDC, it meets stringent requirements for DC-link filtering and energy buffering in ABB medium-voltage and high-power converter systems (e.g., ACS800, ACS880, and similar drive/converters). Key features include low ESR, extended lifetime (>10,000 h @ 70°C), ripple current capability optimized for PWM switching, integrated pressure-relief venting, and RoHS-compliant construction. Revision F indicates the latest controlled design iteration with validated thermal and vibration performance per IEC 61881 and ABB internal specifications.