The MP9-21021K is a high-reliability, three-phase AC filter capacitor module designed specifically for use in industrial variable frequency drives (VFDs), particularly ABB ACS/ACH/AMC series inverters. It integrates three identical 64μF metallized polypropylene (MKP) capacitors in a compact, insulated, and mechanically robust housing — configured for delta connection. Rated for continuous operation at 690VAC (50/60 Hz) and peak DC voltage up to 1100VDC, it meets IEC/EN 61071 and UL 810 standards. Features include self-healing technology, low ESR/ESL, flame-retardant epoxy encapsulation (UL94 V-0), integrated discharge resistors (typically ~10 kΩ per phase, <60 s to <50 V), and M8 screw terminals with IP2X protection. Common applications include DC-link filtering, harmonic suppression, and reactive power compensation in ABB medium-voltage or high-power drive systems.
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