What is the meaning of DC Molded Case Circuit Breaker?

As the system capacity in the market continues to increase, it is important for system designers and installers to understand the mechanics behind the DC Molded Case Circuit Breaker and the implications behind its ratings.

What is the definition of DC Molded Case Circuit Breaker?

What is the difference between the role and purpose of DC Molded Case Circuit Breaker and residual current circuit breakers?

Under what circumstances does the power distribution system use the three-pole leakage DC Molded Case Circuit Breaker and the four-pole leakage DC Molded Case Circuit Breaker?

What is the definition of DC Molded Case Circuit Breaker?

DC Molded Case Circuit Breaker refers to a switching device that can close, carry and break current under normal circuit conditions, and can close, carry and break current under abnormal circuit conditions (including short-circuit conditions) within a specified time. . Circuit breakers can be used to distribute electric energy, start asynchronous motors infrequently, and protect power lines and motors. When they have serious overload or short-circuit and under-voltage faults, they can automatically cut off the circuit. Its function is equivalent to a fuse switch. Combination with overheating and underheating relay, etc. Moreover, it is generally not necessary to change the components after breaking the fault current.

What is the difference between the role and purpose of DC Molded Case Circuit Breaker and residual current circuit breakers?

The difference between DC Molded Case Circuit Breaker and residual current circuit breaker is that the operating environment and function are different.

First, the user environment is different.

1. DC Molded Case Circuit Breaker: Generally used in AC and DC circuits.

2. residual current circuit breaker: generally used in AC circuits.

Secondly, the effect is different.

1. DC Molded Case Circuit Breaker: It is used in power distribution and as white protection for motor undervoltage, overvoltage and short-circuit overload to interrupt the power supply.

2. Residual current circuit breaker: it is used in two-phase and three-phase circuits, when the current imbalance between the power lines exceeds the specified protection value, it is used to interrupt the power supply.

Under what circumstances does the power distribution system use the three-pole leakage DC Molded Case Circuit Breaker and the four-pole leakage DC Molded Case Circuit Breaker?

The three-pole switch in the leakage circuit breaker is three-phase three-wire; the three-pole four-wire is three-phase four-wire, and the zero (N) line is not controlled by the switch; the four-pole is three-phase four-wire, and the zero (N) line Also controlled by switches.

If the control circuit uses 380V voltage, use a three-phase three-wire leakage circuit breaker; if the control circuit uses 220V voltage, a three-phase four-wire leakage circuit breaker should be used; the motor and control circuit should be connected to the outlet of the leakage circuit breaker. To leakage, overload protection.

The power supply system is TN-S, TN-C, TN-C-S, these power supplies are not allowed to cut off the neutral line, only three-pole four-wire leakage circuit breaker can be used.

Four poles and four wires can only be used in dual power supply circuits to prevent the other way from being charged through the neutral line when one way is overhauled, causing danger.

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