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 12, NEMA 4 or NEMA 4X enclosure.

Hybrid 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.

OPTIONS

• Key Removable - When ordering, specify the number of primary and secondary keys. Primary keys are removed from the transfer panel and retained in other interlocks. Secondary keys are held in the transfer panel.
• Number of Locks - See table for details.
• Stamp Key Interchange - specify an alphanumeric code to be stamped on the cylinder face and the key (e.g. A1, A2, B1, etc.). See Data Sheets 11.1, 11.3 and 12.1 for details.