Product Introduction

The MCC (Motor Control Center) is an electrical distribution cabinet used to control the start and stop of motors. It serves as a lower-level component in the PLC system. While PLCs are rarely integrated directly into MCC cabinets, they are responsible for controlling the MCC cabinets themselves. A soft-starter MCC control cabinet consists of the following components: (1) a circuit breaker at the input end; (2) a soft starter (including electronic control circuits and three-phase thyristors); (3) a bypass contactor for the soft starter; and (4) a secondary control circuit that enables selection and operation of functions such as manual start, remote start, soft start, and direct start. This secondary control circuit is equipped with voltage and current displays, as well as indicator lights showing fault status, operational status, and running conditions. Since MCCs are responsible for supplying power to medium- and small-capacity loads, they typically use molded-case circuit breakers. An individual MCC can accommodate between 5 and 20 circuits. According to power design regulations, loads below 75 kW are supplied by MCCs.

An MCC control cabinet is a combination unit assembled completely using structural components, with all internal electrical and mechanical connections made by the manufacturer. It consists of one or more low-voltage switchgear devices along with associated control, measurement, signaling, protection, and regulation equipment. An MCC control cabinet looks very much like a cabinet with numerous drawers; each drawer houses a motor control circuit—including forward/reverse start/stop functions, status indicators, and the main power circuit—all neatly contained within that drawer. An MCC cabinet does not integrate a PLC; rather, the PLC collects signals from the MCC and then outputs signals to control the MCC’s forward/reverse start/stop operations. Low-voltage cabinets are distinguished by their voltage levels—generally speaking, control cabinets are classified as low-voltage cabinets.

Product Structure and Features

1. The cabinet unit features a cabinet frame constructed from PS nine-fold steel profiles. The main frame is designed as a welded structure consisting of side frames and cross beams, allowing for flexible and convenient assembly into various power distribution devices and control systems. It boasts an aesthetically pleasing appearance and achieves a protection rating of IP54, offering exceptional cost-effectiveness.

2. The electrical components inside the cabinet are mounted on modular unit boards, allowing for countless design configurations by combining these modular units. This approach offers flexible selection and convenient installation and maintenance.

3. This product can be wall-mounted reliably, and users have the flexibility to choose either a single-door or a double-door design at the rear for easy maintenance and inspection.

4. The cabinet can be used individually or in combination with other cabinets; special requirements can be met by adding partitions.

Scope of application

The MCC low-voltage switchgear is suitable for industries such as automobile manufacturing, petrochemicals, metallurgy, high-rise buildings, power plants, airports, and port terminals—places that demand a high degree of automation and require interfaces with computers. In power supply systems with rated voltages up to 380V and rated currents of 2500A (or 1250A), this switchgear can be used for incoming power supply, power distribution, motor control, and lighting applications. It can be freely combined to form various types of distribution units, including incoming feeder cabinets, busbar interconnection cabinets, outgoing feeder cabinets, variable-frequency drive cabinets, power and lighting cabinets, and capacitor compensation cabinets. Thanks to its modular busbar-based design, it integrates functions such as power distribution, power supply, motor control, analog signal processing, and capacitor compensation, thereby meeting diverse application requirements. Through cabinet integration design, PLC cabinets and relay cabinets can be arranged in a unified manner, ensuring a rational, aesthetically pleasing, and sophisticated layout.

Work environment

1. Working and Environmental Conditions: Indoor Installation

2. Ambient temperature: The average temperature over 24 hours is 35℃ (maximum 40℃, minimum -5℃).

3. Relative humidity: 50% at 40 hours, 90% at 20 hours.

4. Altitude: Up to 2000 m.

5. Surface Treatment: Anti-corrosion treatment, surface electrostatic powder coating; stainless steel cabinet body available as an option.

Structural Dimensions and Technical Parameters

Structural dimensions

Electrical Technical Parameters