The Siemens 3VM9111-0WJ30 is an extended insulating plate, 3-pole, designed as a 1-unit accessory for 3VM10 and 3VM11 molded case circuit breakers. It provides additional phase-to-phase and phase-to-ground insulation within the breaker enclosure, which is critical when maintaining clearance in tight panel layouts or when the breaker is mounted near grounded metalwork.
Mounts directly onto the 3VM10 or 3VM11 breaker body as a clip-on accessory — no additional hardware or panel modification needed. The extended profile adds 15 mm to the overall depth (packaged dimensions 115 x 100 x 15 mm), so verify clearance against the enclosure door or adjacent components before committing the BOM line.