Yes, a complete distribution box typically includes circuit breakers to protect individual circuits from overloads and short circuits.

A distribution box, also known as a distribution board, breaker box, or consumer unit, is designed to safely distribute electrical power from the main supply to multiple branch circuits while providing protection against electrical faults . In a fully equipped distribution box, the following components are commonly included: Circuit Protection Devices: Most complete distribution boxes contain circuit breakers (MCBs), which automatically disconnect a circuit in case of overload or short circuit. Some boxes may also include fuses, RCDs (Residual Current Devices), or RCBOs (Residual Current Breaker with Overcurrent protection) for additional safety . The main switch or main breaker controls the entire supply to the box, allowing complete disconnection during maintenance or emergencies . Busbars and Terminals: Copper or aluminum busbars distribute power to individual circuits, while neutral and earth bars provide secure connection points for wiring . Enclosure and Safety Features: The outer casing, usually made of plastic or metal, protects internal components and prevents accidental contact with live parts. Some boxes also include indicators, switches, or monitoring systems for easier maintenance . Variations by Application: Residential boxes typically include 6–24 circuits with standard breakers for lighting, outlets, and appliances. Commercial and industrial boxes may include specialized breakers for heavy machinery, three-phase power, and monitoring systems. Portable or temporary distribution boxes may have fewer circuits and sometimes rely on upstream protection, but many still include integrated breakers for safety . In summary, a complete distribution box is designed to include circuit breakers or equivalent protective devices as a standard feature, ensuring safe and organized distribution of electricity across all connected circuits .