Circuit Breaker Lockout is a versatile device fits on wide range of single, double, triple and four pole of electrical circuit breaker can be accommodates up to one lock and with the help of hasp lockout device can be used for group isolation. Designed to lock most of the MCB's and main switches, ideal to be used in residential and industrial purposes. High Quality ABS.Designed to lock most of the MCB's and main switches, ideal to be used in residential and industrial purposes.Two different sizes of sides are provided so that thick and thin both levers of the MCB's can be fitted into it known as Multi function Circuit Breaker lockout.Installation Method - With the help of screwdriver loosen the screw and fit the lever of the MCB according to the thickness of the lever then tighten the screw and then fit the lever in it and put the padlock. Also can provide proper tagging for the identification. On hole for the locking purpose..According to NEC, an overload is the operation of equipment in excess of normal, full-load rating, or of a conductor in excess of rated ampacity that, when it persists for a sufficient length of time would cause damage or dangerous overheating. An overload is NOT a short circuit, ground or arc fault.