A panelboard is a small assembly that contains?

A panelboard is designed primarily to house fuses or circuit breakers. Its main function is to distribute electrical power to various circuits throughout a building or facility. The fuses or circuit breakers provide overcurrent protection, ensuring safety by interrupting the electrical flow in the event of an overload or short circuit. This is crucial for preventing electrical fires and equipment damage. The panelboard serves as a central point where the electrical supply can be managed and controlled, making fuses or circuit breakers essential components in its assembly.

While wiring and connectors, transformers and relays, and control switches can be part of an electrical system, they are not the defining components of a panelboard. Wiring and connectors are used to facilitate electrical connections but do not constitute the main purpose of a panelboard. Transformers and relays are used in different contexts within electrical systems, mainly for voltage adjustment and control functions, but are not typically included within the panelboard itself. Control switches serve to operate specific electrical devices but do not represent the assembly's core function, which revolves around circuit protection and distribution.