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Your cart is empty.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. Device accepts all American Lock® and Master Lock® safety padlocks and most lockout hasps for full lockout. Durable construction stands up in harsh environments and compact design is easy to carry and store.
Tristan North
2025-09-03 13:43:07
Works great on newer panels. Didn’t work on older GE 480 and 277 panels though.
Chad Worthington
2025-08-27 15:19:28
Good lock
Russell S.
2025-08-18 18:53:01
The product is fine. I ordered a standard CB Lockout and a more expensive tall and wire CB Lockout. However, I received two of the standard CB Lockout (See photo). I could not find a link for seller feedback so I leaving a message here in case someone else has a similar order issue.
Steven Bock
2025-07-05 18:01:58
I attached it and it didn't fit flush with the switch, and when I tightened it as well as I could, I was able to move the whole lock to the left which shut the power off, which is what I was trying to avoid.
H. Weggeman
2025-01-23 17:45:08
I did not really like this breaker lock. It does not seem to lock onto the breaker very well. I am using it on a double breaker.
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