This Universal circuit breaker lockout is designed to fit most modern multiple pole miniature circuit breakers. Manufactured from strong nylon, this device has a small metal tongue that locates under the breaker cross bar. The thumbwheel is then adjusted to lock onto the bar and prevents the breaker being switched. The padlock is finally secured through the hole which traps the thumbwheel in the "locked" position and then renders the circuit breaker totally safe and unable to be accidentally re-energized.