BUS DUCT PLUG-IN UNIT WITH IMPROVED INTERLOCK

摘要

A plug-in unit is hooked into notches in the upper flange of a bus duct, plugged into the duct by swinging it down against the side of the duct wherein stab connectors enter a duct opening to engage the bus bars therein, and latched to the side of the duct by spring biased latches which engage the bottom flange of the duct. An interlock between the unit operator and one of the latches blocks movement of that latch wherein it interferes with the bottom flange to prevent plugging in or removal of the unit with the enclosed switch thereof in the "ON" condition. Indicators are provided on the sides of the bus duct to assist in positioning the unit into the notches when the upper flange is not visible.