All About Marine-Circuit-BreakersAll About Marine-Circuit-Breakers What is a Short Circuit? A short circuit is where two points of different electrical potential are connected, that is positive to negative. There is what is often called a dead short circuit and an impedant short circuit. Dead short circuits are where the positive and negative are directly connected together without any resistance between them. This is actually rare and occurs when circuits are connected incorrectly, usually in a new installation. Impedant short circuits are the most common and where there is some impedance or resistance. Typically examples are where a breakdown across a terminal block occurs. What is an overload? An overload condition is where the circuit current carrying capacity is exceeded by the connection of excessive load. Excessive load can come from too many devices or equipment such as pumps with higher than normal mechanical loads. All About Marine Circuit Breakers The circuit breaker is the most reliable and practical method of circuit protection. Physically they are manufactured in press button, toggle type, or rocker switch. The term trip free is used to describe a breaker that cannot be held closed when it has tripped, and this is an ABYC requirement. They also are either magnetic or thermal (bimetallic) types. Ideally they are used for the circuit isolation and protection, combining both functions. This saves switch panel space, costs and installation time as well as improving reliability. Single pole circuit breakers are normally fitted to boats. Circuit breakers must be selected for the cable size that they protect. The rating must not exceed the maximum rated current of the conductor
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