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A distribution board (also known as panelboard, circuit breaker panel, breaker panel, electric panel, fuse box or DB box) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit breaker for each circuit in a common enclosure.
Interior of a Federal Pacific Electric Stab-Lok circuit breaker panel. Stab-Lok is a brand name of electrical circuit breakers that were manufactured primarily by Federal Pacific Electric from 1950 to 1980.
All circuit breaker systems have common features in their operation, but details vary substantially depending on the voltage class, current rating and type of the circuit breaker. The circuit breaker must first detect a fault condition. In small mains and low-voltage circuit breakers, this is usually done within the device itself. Typically ...
Zinsco would remain with copper in both their panels and breakers until the third major copper shortage in the early 1960s, when they would switch to an aluminum bus. In 1963, Zinsco introduced the R-38 twin breaker, which was the only twin circuit breaker that also made contact on both bus-bars for 240 volts in a single breaker space.
To support these old panels, non-CTL circuit breakers that bypass the rejection feature are still sold "for replacement use only." [ 2 ] As a result, numerous unsafe situations have resulted where panels were dangerously overloaded because these non-CTL breakers continue to be used.
A man shines a flashlight at residential circuit breaker panel. Breakers have become a target for thieves, police say. (Getty Images / iStockphoto)
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