XL-21 Low Voltage Motor Control Center LV Switchgear

Cotenele is a manfacturer of XL-21 Low Voltage Motor Control Center LV Switchgear, The XL-21 low-voltage switchgear is one of the earliest and most widely used power distribution switchgears in China. Its main purpose is to distribute electrical energy to end-use equipment within power systems operating at a frequency of 50Hz and rated voltages of 380V (or 400V/500V/660V), while providing equipment control and circuit protection. It is compatible with various grounding systems, including three-phase three-wire, three-phase four-wire, and three-phase five-wire (e.g., TN-C, TT).

The XL-21 low-voltage switchgear has the advantages of reliable quality, flexible installation, and easy maintenance, and complies with relevant national and international standards such as GB/T 7251, IEC 60439, CCC, etc. Cotenele has passed the ISO9001 quality management certification.

Model and meanings

Main technical parameters

What are the product structure characteristics of XL-21 switchgears?

1. Enclosure: XL-21 low-voltage switchgear shell adapts fully enclosed design, This design can offer effective protection against dust and outside objects. Standard protection grade is IP30, with higher grade available upon request. The low-voltage has two construction types: assembly type (high versatility) and welded type (high strength).

2. Installation & Maintenance: The XL-21 Low Voltage Motor Control Center LV Switchgear is designed for wall mounting and front-side maintenance, saving space. When the door is open, all internal components are fully exposed, which make its routine maintenance very convenient.

3. Internal Layout: This panel adapts beam or plate structure for flexible layout. Operating elements such as the push buttons, indicator lights and instruments such as voltmeter, ammeter are mounted on the door, while the main switch operating handle is located on the right front side of the cabinet for easy access.

4. Materials & Finish: The enclosure of the low-voltage switchgear is made of high-quality cold-rolled steel plate which minimum thickness 1.5mm, bent and welded for high strength. The surface is treated with electrostatic powder coating for excellent corrosion resistance. The door can open to an angle no less than 120 degrees for easy access. Both the enclosure and door are fitted with ground screws to ensure safe and reliable grounding.

The Core Function And Components For The XL-21 Low-voltage panel

1. Core Functions

The XL-21 Low Voltage Motor Control Center LV Switchgear is often used to provide reliable power supply to connected equipment, which used for precise start/stop control for motors and other loads. It also supports real-time operational monitoring of key parameters such as current and voltage, At the same time, ensure comprehensive circuit protection functions to cope with faults such as overload, short circuit, and leakage.

2. Typical Components

The XL-21 low-voltage panel commonly includes several belowing core components, such as molded case circuit breakers (MCCBs), air circuit breakers (ACBs), residual current circuit breakers (RCCBs), etc. The main switch or incoming switch, for example the CM1-400L molded case circuit breaker, controls the incoming power supply of the entire distribution panel and is usually located at the incoming end of the main circuit. Branch switches or outgoing switches, such as the CM1-100L circuit breaker or contactors, responsible for managing independent branch circuits such as motors or lighting.

Protective devices are typically integrated into the circuit breaker trip units, providing overload and short-circuit protection, with optional residual current protection accessories. The control devices enable local or remote operation of AC contactor coils to start or stop high-power equipment.Finally, various indicators and operators including voltmeters, ammeters, indicator lights, and push buttons, together with the cabinet-mounted components, form a complete control and display interface.

Operating Conditions And Installation Environment

To ensure long-term stable operation, the following environmental conditions must be met:

1. Altitude: Generally ≤2000 m; special treatment required for higher altitudes.

2. Ambient temperature: -10°C to +40°C, with 24-hour average ≤+35°C.

3. Relative humidity: ≤50% at +40°C; up to 90% at +20°C – condensation must be prevented.

4. Mounting inclination: ≤5° from vertical to ensure stability.

5. Environmental conditions: No severe vibration or shock; no corrosive or explosive gases; no conductive dust.

6. Storage & transport: Before installation, store in a dry, clean place to avoid moisture. Foundation channels and anchor bolts are to be provided by the user.

Appearance and installation instruction diagram

Operation, Maintenance, and Inspection

Before putting the power distribution cabinet into service after installation or overhaul, the following inspections and tests must be carried out (the inspections and tests after overhaul shall be determined based on the nature of the overhaul):

1. Check whether the electrical equipment and secondary wiring installed inside the power distribution cabinet comply with the drawing requirements.

2. Check whether the knife switch and air switch used for operation are flexible and free from jamming.

3. Check whether the electrical equipment has good contact and meets the operating requirements of the equipment itself.

4. Check whether there are any foreign objects inside the power distribution cabinet and whether any tightening screws on various parts are loose.

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