DC circuit breakers refer to circuit breakers used in DC power distribution systems. Generally applicable to solar photovoltaic power generation and power distribution systems, battery energy storage systems, new energy vehicle DC charging systems, etc.
A system in which the input power supply terminal of the circuit breaker is DC current.
General DC circuit breakers include DC MCB (Miniature Circuit Breaker), DC MCCB (Mold Case Circuit Breaker), and Type B RCD (Residual Current Device).
DC MCB is specially designed for direct current (DC) circuit applications and is used for over-current and short-circuit protection in electrical appliances or electrical equipment.
DC MCB and the AC MCB are same functions. but, the usage scenarios of AC MCB and DC MCB are different.
DC MCB mostly uses for direct current (DC) systems application, such as new energy, solar photovoltaic (PV) and Solar cell energy storage system. The voltage state of DC MCB is generally DC 12V-1500V.
The difference between AC MCB and DC MCB in physical parameters on products.
The AC MCB are marked as LOAD and LINE on products, and the DC MCB marked as positive (+), negative (-) signs and the direction of the current on products.
DC CIRCUIT BREAKER
DC MCCB (Molded Case Circuit Breaker)
DC MCCB (Molded Case Circuit Breaker) are ideal for energy storage, transportation, and industrial DC circuits.
DC MCCB with same functions of AC MCCB, it has overload and short-circuit protection functions for high-current power distribution systems.
They are also used in ungrounded battery supply circuits for emergency back-up and standby power. Available up to 150A, 750 VDC and up to 2000A, 600 VDC. For DC breakers used in grounded photovoltaic systems in solar installations, application engineering and review ensures protection requirements are met.
DC MCCB (Mold Case Circuit Breaker) is a circuit control protection device for energy storage, transportation and industrial DC circuits. They are also used in ungrounded battery-powered circuits to provide emergency backup power and backup power. TONGOU DC MCCB can provide up to 150-800A, 380V-800V DC.
DC CIRCUIT BREAKER
Can i use a ac circuit breaker for dc?
The signal of AC current is constantly changing its value for every second. The circuit breaker arc will be extinguished at 0 volts, and the circuit will be protected from big current. But the signal of DC current is not alternating, it works in a constant state, and the voltage value will only change when the circuit is tripped or the circuit is reduced as a certain value.
Otherwise, the DC circuit will provide a constant voltage value for every second of a minute. Therefore, since there is no 0 volt point in the DC state, it does not suggest that use a AC circuit breaker for the DC state.