The Master Lock No. 491B Grip Tight™ Circuit Breaker Lockout Device fits wide or tall breaker toggles typically found on hi-voltage/hi-amperage breakers. The innovative patented Grip Tight™ design effectively locks out circuit breakers with a simple thumb turn and then close clamping handle for a tight grip on the toggle.
This Master Lock® Grip Tight™ Circuit Breaker Lockout device helps prevent accidental engagement of electrical circuits during maintenance. It works on switches with or without holes and uses cleats, with clamp-on lockout, to assure positive restraint for breakers with long sliding switch throws.