GHM Series Low Voltage Power Distribution Box
GHM series distribution box is a modular low voltage distribution enclosure designed and assembled with various control and protection functions according to specified component models, ratings, and configurations. The product is widely used in industrial and civil buildings for power distribution, lighting distribution, and automation control in power systems with rated voltage up to 380V/400V AC and rated frequency of 50Hz/60Hz.
The enclosure accommodates a wide range of DIN-rail mounted or fixed-base electrical components including miniature circuit breakers (MCBs), moulded case circuit breakers (MCCBs), residual current circuit breakers (RCCBs), contactors, relays, timers, terminal blocks, and busbar systems — allowing flexible configuration to meet specific application requirements. Standardized enclosure dimensions and mounting centers simplify panel layout design and reduce assembly time.
Technical Specifications
| Item | Specification |
|---|---|
| Rated Voltage | 380V / 400V AC |
| Rated Frequency | 50Hz / 60Hz |
| Rated Current (Main Busbar) | Up to 630A (depending on enclosure size) |
| Rated Short-time Withstand Current (Icw) | 10kA / 15kA / 25kA (1s) |
| Degree of Protection | IP30 / IP40 / IP54 (indoor/outdoor selectable) |
| Installation Type | Indoor, wall-mounted or floor-standing |
| Enclosure Material | Cold-rolled steel with epoxy powder coating / Stainless steel (optional) |
| Enclosure Thickness | 1.2mm – 2.0mm (sheet metal) |
| Component Mounting | DIN rail (EN 50022 / 60715) or fixed base plate |
| Cable Entry | Top / Bottom / Side knockouts (configurable) |
| Door Type | Solid door or transparent window door (optional) |
| Operating Temperature | -5°C to +40°C |
| Standards | IEC 61439, GB/T 7251 |
Key Features
- Modular and Flexible Configuration: Designed for custom assembly with a wide range of standard electrical components — MCBs, MCCBs, RCCBs, RCBOs, contactors, thermal overload relays, timers, control transformers, terminal blocks, and busbar systems can be configured to meet specific power distribution, lighting control, and motor control requirements
- Wide Application Range: Suitable for power distribution (main and sub-main distribution boards), lighting distribution (final lighting circuits), and automation control (motor starters, pump controllers, HVAC control panels) in both industrial and commercial building environments
- Standardized Enclosure Dimensions: Available in a range of standard enclosure sizes with uniform mounting centers and modular DIN-rail spacing — simplifying panel design, reducing engineering lead time, and enabling straightforward future circuit expansion
- Robust Construction: Cold-rolled steel enclosure with durable epoxy powder coating provides mechanical protection for internal components, corrosion resistance in indoor environments, and consistent appearance across installation sites
- Flexible Cable Entry: Top, bottom, and side cable entry knockouts with removable gland plates provide flexible cable routing options to accommodate different site installation layouts and cable routing preferences
- Simplified Maintenance: Front-accessible components with clearly labeled circuits and ample working space inside the enclosure simplify routine inspection, testing, and circuit modifications by maintenance personnel
- Optional Transparent Door: Transparent polycarbonate window door option allows visual inspection of component status indicators, meter displays, and protective device trip indications without opening the enclosure door
Applications
- Industrial buildings — factory floor power distribution and lighting control
- Commercial buildings — office lighting distribution, small power, and HVAC control
- Residential buildings — apartment building main and sub-main distribution boards
- Infrastructure — schools, hospitals, public facility power distribution
- Light industrial — small motor control centers and automation panels
- Building services — fire pump control, ventilation fan control, and lighting management