All primary (initiating) keys must be inserted into the transfer panel before any secondary (retained) keys can be turned and removed. Once a secondary key is removed, all primary keys are held captive in the transfer panel.

Transfer panel primary keys are generally related to power sources (such as breakers, T/R switches, level detectors, etc.) and secondary keys are often associated with access doors.

Transfer keys, locks, and mechanical linkages are completely enclosed in a NEMA 4 or NEMA 4X enclosure.

Series 316 transfer panels are designed to accept and release keys sequentially. Insert and turn the missing keys (one at a time starting from the end) and work your way towards the held keys. The held keys will be released (one at a time) in a continuation of the same sequence. Reverse the key sequence when restoring service.

316 Series Type F Interlock 316 Series Type B Interlock 316 Series Type D Interlock 316 Series Type DM Interlock

316 Series Type T Interlock 316 Series Type TPS Interlock 316 Series Transfer Panel