what is circuit breaker ?

Views: 0     Author: Site Editor     Publish Time: 2022-11-28      Origin: Site

300A marine circuit breaker (2)

A circuit breaker (CB) is an electrical safety device used to protect a circuit from overcurrent or short circuit, whose basic function is to interrupt the current (cut off the circuit) to protect the equipment (electrical appliances in the circuit) and prevent the risk of fire. ON/OFF power can be closed and disconnected. 

The  characteristics of the circuit breaker mainly include: rated voltage Ue;  Rated current In; Trip current setting range for overload protection and short-circuit protection; Rated short-circuit breaking current, etc.

Rated working voltage : This is the voltage at which the circuit  breaker works under normal (uninterrupted) conditions.

Rated current: This is the maximum current value that a circuit  breaker equipped with a special overcurrent trip relay can withstand  indefinitely at the ambient temperature specified by the manufacturer, and  will not exceed the temperature limit specified by the current bearing  component.

Short-circuit relay trip current setting value: Short-circuit trip  relay (instantaneous or short delay) is used to make the circuit breaker trip  quickly when high fault current values occur, and its trip limit Im.

Rated short-circuit breaking capacity: The rated short-circuit  breaking current of a circuit breaker is the highest (expected) current value  that the circuit breaker can break without being damaged. The current value  provided in the standard is the rms value of the AC component of the fault  current, and the dc transient component (which always occurs in the worst  case short circuit) is assumed to be zero when calculating the standard  value.

Thermal   tripping is generally based on the principle of bimetal. There is a bimetal   inside, when the current exceeds the rated value, the bimetal will bend due   to heating, and then trip the contact and break the circuit to pretected   device.

The function of this high-current circuit breaker is to disconnected and connected the load circuit, as well as break the fault circuit, prevent the  device from destroy.The core component of this high-current circuit breaker circuit breaker is a bimetal which remains in contact with the main contact of the circuit during normal operation and is in the circuit on state.When the circuit is overloaded, the bimetal generates a lot of heat due to the high current load, deforms by heating, disconnects with the circuit contact, break the circuit, and plays a role in protecting the electrical equipment.The higher the current, the shorter the action time.

Usually, you can first fix the circuit breaker to the base (if there is one), then connect the circuit breaker in series with the device which need to be protected, and the BAT(LINE) connected to the battery positive and the AUX connected to the load.

The maximum short-circuit current that a breaker can interrupt is determined by testing. Application of a breaker in a circuit with a prospective short-circuit current higher than the breaker's interrupting capacity rating may result in failure of the breaker to safely interrupt a fault. In a worst-case scenario, the breaker may successfully interrupt the fault, only to explode when reset.

Amomd circuit breaker is mainly used for marine boat, so it is marine circuit breaker, also can use in below 32v DC circuit breaker.


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