What is the purpose of the power cabinet

In factory workshops, building equipment rooms, or power engineering sites, we often see various types of cabinet equipment—some labeled "control cabinets," some marked "distribution cabinets," and others identified as "power cabinets." Many people, even industry novices, often confuse them, believing "they are all cabinets for installing electrical components with no fundamental difference." However, in reality, these three types of cabinets differ vastly in functional positioning, internal structure, and application scenarios. Choosing the right one ensures stable equipment operation, while the wrong choice may lead to safety hazards. Today, we’ll use a single article to thoroughly clarify the core differences among them.

I. Core Definition: First, understand "each respective mission."
1. Distribution cabinet: the "distribution hub" of the power system
The core mission of a distribution cabinet (also known as a power distribution panel or power box) is power distribution and circuit protection. It functions like the "traffic hub" of the power system, receiving high/low voltage power from transformers or generators. Through internal components such as circuit breakers, fuses, and busbars, it divides the power into multiple circuits and distributes it to downstream equipment, lighting, sockets, and other terminals.
Simply put, the core function of a power distribution cabinet is "power distribution"—it does not directly control the start-stop of equipment but is responsible for the transmission, allocation, and overload/short-circuit protection of electrical energy. For example, the main power distribution cabinet in a residential basement divides the grid power into multiple circuits to supply each building, while the power distribution cabinet in a factory workshop allocates the main power supply to equipment in different areas.
2. Control cabinet: the "command center" for equipment operation
The core mission of the control cabinet is to handle the start-stop, speed regulation, and interlocking control functions of equipment. It acts as the "brain" of the equipment, receiving operational commands or sensor signals through internal components such as PLCs, contactors, relays, frequency converters, buttons, and indicator lights, enabling precise control of actuators like motors, pumps, and fans.
For example: The elevator control cabinet receives floor button signals and controls the motor's forward and reverse rotation to achieve vertical movement; the water pump control cabinet automatically starts or stops the pump based on signals from the water tank level sensor; the production line control cabinet uses PLC programming to coordinate the operation of multiple devices. The core function of the control cabinet is "electrical control"—it does not handle power distribution but focuses solely on managing the operational status of equipment.
3. Power cabinet: "Dedicated power supply + simple control" for high-power equipment
The core mission of the power cabinet is to provide dedicated power supply and basic control for high-power power equipment. It serves as a "simplified combination" of the "power distribution cabinet" and "control cabinet," delivering stable power supply (similar to the power distribution function of a power distribution cabinet) while enabling simple start-stop operations and overload protection (akin to the basic control functions of a control cabinet) for equipment such as motors and compressors.
For example, the motor power cabinet in a factory contains both circuit breakers (for power supply protection) and contactors, thermal relays (for motor start-stop control and overload protection). The power cabinet for building fire pumps not only supplies power to the pumps but also receives fire signals to activate the pump bodies. The core of the power cabinet is "dedicated power + basic control"—designed for high-power motor equipment, integrating power supply and simple control functions without the need for additional distribution or control cabinets.