Master Lock 491B Lockout Tagout Circuit Breaker Lockout, Tall and Wide Toggles

I bought this breaker lock-out as a reminder to not turn this breaker on, unless you really need it. I use this on the 240V, 50 AMP, Electric Vehicle / Recreational Vehicle outlet that I installed under our breaker panel. Most of the time, this should be turned OFF, but on rare occassion it needs to be turned on. This Lock-out makes it really easy to remember to keep it turned Off when not needed and prevents people from turning it on by accident. The quality of construction is excellent and although I didn't need to use the fitment accessories that came with it, I appreciate that they were included. Nothing is as frustrating as not being able to finish a project beause of a fitment issue. Master Lock had this in mind and they have you covered. Great little product. I would definately buy it again.

I'm an electrician, I use these whenever I work on a job. It keeps someone from flipping on the breaker while I'm working on the circuit. They work perfectly.

Works on residential breakers. Make sure you use the included bands to make sure the device has enough surface friction to grip. Great for locking out a breaker that leads outside during a project

I bought this lockout for a four pole quadplex breaker. I wanted to shut off the inner toggles of a 240 volt, 40 amp breaker (see pictures). Because the outer metal pairing brace (AKA "that metal thingy"), the lock wouldn't engage with the inner two 40 amp toggles. The description does mention working with tie-bars such as what I have with the 40 amp toggles but when the outer metal pairing brace also exists, this lockout won't work. I've included some pictures that illustrate the problem. Dare I say better pictures than the seller provided. Although this device won't work for me, it seems to be a decent product. I am able to lock out single pole toggles ok. The grip of the toggle is pretty strong. Tighten with the thumbscrew. Then when you swing down the arm, it increases the pressure and it would take some work to pull it off. It might not be suitable to lock out a breaker from a neighbor stealing power but in a safety situation it should be fine. I'm going to keep this lockout for other breakers. I dropped a star mainly because the description is ambiguous, not because the device is poor.

Simple to use and reliable. Turn to knob until the pads touch both sides of the breaker, close the cover and it clamps down. Simply, easy, reliable.

Literally, this device can be a life saver. It will prevent unauthorized energization of a circuit. A must have for anyone working on a circuit or on a circuit that needs to remain de-energized.

This is simple to use and highly effective. For roughly $10, it gets the job done and then some. Locally I tried to find something like this and it was $50. It clamps onto the breaker switch (whether it is on or off) and then the swing arm further tightens it. IT then has a loop you can use a zip tie or a small padlock. It can be pried off (with significant effort) but what you are really trying to do is make it difficult to "accidentally" move the breaker from the position you want.

I was very pleased this was adjustable enough to fit this breaker handle. Was a 480Vac 3ph panel board. I found it fits a variety of BKRs from ABB, Siemens, Eaton, Sqr-D, LS-Electric & others. Don’t panic if the angle of the grippers doesn’t perfectly align with the angle pitch of your breaker handle, just tighten it down, lock it, & you’re good to go. I trust it on the job. Great value, easy to use, it’s worth 30-seconds to keep me alive.

Muy buen producto para el trabajo

Me parece de buena calidad y robusto. un poco caro pero contento con la compra

Commande reçu à temps et quantité exact contrairement à d’autre. Top top

Works extremely well . Was impressed . Would buy it again .

Worked perfectly for my job. Allowed me to lock out 575v circuit breaker without problems