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2. DC distribution system (ship propulsion) - Wikipedia

   en.wikipedia.org/wiki/DC_distribution_system...

   DC links are ideal for this, but cannot be safely deployed without the necessary protection. Proper selection of protective devices (such as a DC breaker switch, high-speed fuse, or a circuit breaker) and their allocation according to distribution protection zones enables system integrators to achieve protection selectivity.

3. Contact breaker - Wikipedia

   en.wikipedia.org/wiki/Contact_breaker

   Breaker arm with contact points at the left. The pivot is on the right and the cam follower is in the middle of the breaker arm. A contact breaker (or "points") is a type of electrical switch, found in the ignition systems of spark-ignition internal combustion engines. The switch is automatically operated by a cam driven by the engine.

4. Zinsco - Wikipedia

   en.wikipedia.org/wiki/Zinsco

   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.

5. Circuit breaker - Wikipedia

   en.wikipedia.org/wiki/Circuit_breaker

   A small circuit breaker typically has a manual control lever to switch the circuit off or reset a tripped breaker, while a larger unit may use a solenoid to trip the mechanism, and an electric motor to restore energy to springs (which rapidly separate contacts when the breaker is tripped).

6. Distribution board - Wikipedia

   en.wikipedia.org/wiki/Distribution_board

   North American distribution boards are generally housed in sheet metal enclosures, with the circuit breakers positioned in two columns operable from the front. Some panelboards are provided with a door covering the breaker switch handles, but all are constructed with a dead front; that is to say the front of the enclosure (whether it has a door or not) prevents the operator of the circuit ...

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