Kirk Key Interlock Safeguards Small Circuit Breakers
Melissa Larson | April 7, 2015
Kirk Key has developed a reduced size mechanical bolt interlock for smaller stature breakers. Modelled on the Kirk Standard Duty series Type F, the smaller Type FF ensures that workers follow a pre-determined sequence of operation to safely access electrical switchgear. Manufactured with a brass lock housing and cylinder, the Type FF has a ¾ in. travel, with a smaller diameter ½ in. stainless steel lock bolt to better fit in smaller cabinets. The proprietary 7-pin tumbler key design is unique to Kirk and not available commercially, minimizing the risk of circumventing safety sequences with duplicate keys.
The Type FF footprint is 2 in. x 1¼ in. and is generally flat or face mounted with ¼ in. mounting bolts through the front of the housing. The reduced footprint of the Type FF is approximately 50% smaller and nearly 60% lighter, allowing for greater clearance around the breaker within the switchgear assembly.
The Type FF, in conjunction with Kirk’s current comprehensive line of Standard Duty bolt, electro-mechanical, access, transfer, and cylinder interlocks, creates a complete trapped key interlock system for switchgear and other process safety applications.
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