Capacity: The capacity of a distribution box is determined by the size of the electrical system it is connected to and the number of circuits it is designed to control. Larger buildings and facilities will typically require larger distribution boxes with higher capacity.
Circuit breakers: Circuit breakers are a key component of distribution boxes, as they are used to protect the electrical system from overloading and short circuits. They work by automatically cutting off the power supply when the current exceeds a certain level, which helps to prevent damage to the electrical components and reduce the risk of electrical fires.
Fuses: Fuses are another component of distribution boxes that are used to protect the electrical system from overloading and short circuits. They work by melting the conducting element inside the fuse when the current exceeds a certain level, which breaks the circuit and cuts off the power supply.
Busbars: Busbars are metal bars that are used to connect the different components of the distribution box, including the circuit breakers, fuses, and switches. They provide a low-resistance path for the electrical current to flow, which helps to minimize energy loss and maintain the efficiency of the system.
Consumer units: Consumer units are a type of distribution box that is typically used in residential buildings to control the power supply to different circuits. They are usually smaller and less complex than main distribution boards, but they perform a similar function by controlling the distribution of power throughout the building.
Final distribution boards: Final distribution boards are a type of distribution box that is located close to the point of use, such as in individual rooms or sections of a building. They are used to control the power supply to specific circuits, such as lighting or heating, and can be used to provide additional safety features, such as residual current devices (RCDs).

Basic Size

Width (mm)	Height (mm)	Depth (mm)	Thinness (mm)
250	300	150	0.8-2.5
250	300	200	0.8-2.5
300	400	180	0.8-2.5
300	400	250	0.8-2.5
400	500	200	0.8-2.5
400	500	300	0.8-2.5
400	600	200	0.8-2.5
500	600	200	0.8-2.5
500	600	250	0.8-2.5
500	600	300	0.8-2.5
500	700	200	0.8-2.5
500	700	250	0.8-2.5
600	800	200	0.8-2.5
600	800	300	0.8-2.5
600	900	300	0.8-2.5
800	1000	200	0.8-2.5
800	1000	250	0.8-2.5
800	1200	250	0.8-2.5