A circuit breaker is an electrical switch designed to protect an electrical circuit from damage caused by overcurrent/overload or short circuit. Its basic function is to interrupt current flow after protective relays detect a fault.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.Universal 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. High quality ABS KRM Universal Circuit Breaker Lockouts will lockout most type of breaker’s lever. One size fits in all type of circuit breakers having nose Or without nose for better gripping which is UV resistant and suitable for single, double, tripe and four pole circuit breaker can be locked with single padlock and lockout hasp.length 56 mm, width 26 mm, thickness 19 mm, outer Thickness at locking end 11 mm, locking Hole diameter 9 mm, average Centre internal Grip 13.5 mm