Large current DC 2 pole mcb box circuit breaker has a large capacity, and its rated current is generally 630-5000A, and a variety of releases can be installed. It has a large number of auxiliary contacts, and different release combinations can constitute different protection characteristics. In addition, the high-current DC 2-pole mcb box circuit breaker can realize remote control and intelligent control through auxiliary contacts.
Generally speaking, 2 Pole Mcb Box can be divided into small capacity and large capacity. Small-capacity (below 600A) DC circuit breakers are mostly used for protection lines of photovoltaic power generation systems and overload, under-voltage and short-circuit protection of power equipment. Large-capacity (above 1000A) high-current DC circuit breakers are mostly used for the main switch of the transformer outlet of the photovoltaic power generation system, the large-capacity feeder switch and the control of the large motor.
The circuit breaker protection circuit, we often think of it, is the switch protection of the entire line. In fact, it also has selective upper and lower graded protection, which refers to the coordination of protection characteristics between upper and lower electrical appliances in the system. When an overcurrent fault occurs at a certain point, the circuit breaker or fuse designated to work within this range will operate, while other protective appliances will not operate, thereby limiting the number of loads affected by the fault to a minimum.
Class B 2 Pole Mcb Box with three-stage protection functions such as overload long delay, short circuit short delay and short circuit instantaneous action can realize selective protection, and most main lines (including transformer outlet) use it as the main protection switch. Class A circuit breakers without short-circuit short-time delay function (only overload long-time delay and short-circuit transient two-level protection) cannot be used for selective protection and can only be used in branch circuits. The control system can be combined into two-level protection according to the design requirements (such as instantaneous trip plus short-delay trip or instantaneous trip plus long-delay trip), or it can be combined into one-level protection only.
The distribution box 2 Pole Mcb Box has the characteristics of small size, easy installation, special technical performance, fixed position, unique configuration function, no site restrictions, common application, stable and reliable operation, high space utilization, small footprint and environmental protection effect. It is the control center that instructs various components in the power supply line to reasonably distribute electric energy, and is the control link that reliably receives the upper-end power supply and correctly feeds out the load electric energy. Improving the operational reliability of the power distribution box is the goal of creating a high-quality project.
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