The Clamp-On Circuit Breaker Lockout is a safety device meant to lock electrical breakers (single- or multi-pole) in the OFF position, preventing accidental or unauthorized switching during maintenance or servicing. It uses a simple clamp mechanism — a thumb-screw tightens the lockout over the breaker handle or toggle, then a cover locks over the screw and a padlock secures the cover. Because it is made from non-conductive plastic, it provides insulation and protection. Two versions cover typical low-voltage breakers (120–277 V) and higher-voltage breakers (480–600 V), making the lockout suitable for a wide range of electrical panels and installations. Key Features: Works across 120–277 V and 480–600 V breaker ranges; Tool-free clamp-on installation with thumb-screw for easy use; Made of durable, non-conductive polypropylene / nylon for electrical safety; Fits a variety of breaker handle widths (with adjustable or different sizes); Allows padlock attachment to enforce lockout until authorized removal. Industrial Uses / Applications: Electrical panel maintenance lockout; Industrial & commercial facility breaker isolation; High-voltage and low-voltage breaker safety lockout; Lockout–tagout (LOTO) procedures during repair or servicing; Preventing unauthorized circuit re-energizing.