AMIKON INDUSTRIAL SUPPLY · SIEMENS SENTRON 3VL 3VL9300-3HF05 DOOR-COUPLING ROTARY OPERATING MECHANISM A standard mechanical operating accessory for selected Siemens SENTRON 3VL molded case circuit breaker installations. 01 / PRODUCT IDENTITY Mechanical Operation · Cabinet Door Integration Designed to provide external rotary operation of a compatible circuit breaker through an electrical enclosure door. The assembly forms part of the cabinet's mechanical operating arrangement.