The MP9-21458K is a high-reliability, three-phase AC filter capacitor module designed specifically for demanding industrial drive applications. It integrates three identical 330μF, 1000VAC metallized polypropylene (MKP) capacitors in a compact, mechanically robust, and thermally optimized housing. Rated for continuous operation at 1000VAC (50/60 Hz), it meets stringent requirements for harmonic filtering, reactive power compensation, and DC-link stabilization in ABB medium-voltage and high-power converter systems — including ACS880, ACS800, and compatible modular multilevel or active front-end (AFE) drives. Features include self-healing dielectric, low ESR/ESL, flame-retardant UL94-V0 housing, integrated discharge resistors (typ. <5 min to <50V), and IP2X-rated terminals. Compatible with ABB’s standard mounting interfaces and cooling layouts; replacement requires adherence to ABB’s documented procedures and safety lockout/tagout (LOTO).