MLX-2000 Underground Loop Box (Engineering Plastic Enclosure)
MLX-2000 loop box offers reliable insulation performance, high mechanical strength, excellent flame retardancy, corrosion resistance, a novel aesthetic shape, smooth and attractive surface finish, long service life, and the flexibility of arbitrary color matching — advantages that are difficult to achieve with conventional metal enclosures. Its practical application range is extremely wide, serving as a lighting and power terminal distribution box produced for lighting and power distribution systems in new residential buildings, industrial plants, shopping malls, factories, mines, office buildings, and other commercial and industrial facilities across industry, commerce, construction, electricity, and power supply sectors
Technical Specifications
| Item | Specification |
|---|---|
| Rated Voltage | 400V AC |
| Rated Frequency | 50Hz / 60Hz |
| Rated Current | Up to 225A / 400A (selectable by configuration) |
| Rated Short-time Withstand Current (Icw) | 10kA / 15kA / 20kA (1s) |
| Enclosure Material | Flame-retardant engineering plastic (PC/ABS alloy) |
| Flammability Rating | UL 94 V-0 (self-extinguishing within 10 seconds) |
| Insulation Resistance | ≥ 1000 MΩ (at 500V DC) |
| Dielectric Strength | ≥ 2500V AC for 1 minute |
| Degree of Protection | IP54 / IP65 (optional) |
| Surface Finish | Smooth, UV-stabilized, color-stable |
| Color Options | Customizable per project requirements (standard RAL or custom) |
| Internal Mounting | Pre-installed 35mm DIN rail + mounting plate |
| Cable Entry | Bottom entry with multi-diameter knock-out holes |
| Grounding | Integrated copper grounding terminal bar |
| Operating Temperature | -25°C to +60°C |
| Service Life | ≥ 20 years under normal operating conditions |
| Standards | GB/T 7251, IEC 61439 |
Key Features
- Superior Insulation Performance: The high-grade engineering plastic enclosure provides inherently excellent electrical insulation with dielectric strength exceeding 2500V AC, eliminating the risk of phase-to-enclosure faults common in metal enclosures in condensation-prone underground environments — the material also prevents tracking and creepage current formation on internal surfaces
- High Mechanical Strength: Reinforced PC/ABS alloy construction delivers exceptional impact resistance and compressive strength for underground pit installations subject to soil settlement, surface traffic loads, and accidental impact — maintaining structural integrity and IP protection rating over the full service life
- UL 94 V-0 Flame Retardancy: The material achieves UL 94 V-0 classification — the highest flame retardancy rating for plastic materials — with self-extinguishing within 10 seconds and no flaming drip propagation, significantly reducing fire risk in building and underground installation environments
- Complete Corrosion Immunity: Fully immune to rust, chemical attack, soil corrosion, salt spray, and atmospheric pollutants — the plastic enclosure will never corrode, pit, or degrade in underground, coastal, or industrial environments, eliminating the need for periodic repainting or surface treatment required for steel enclosures
- Novel Aesthetic Design: The injection-molded enclosure features smooth, flowing contours and a modern appearance not achievable with fabricated metal sheet construction — available in any RAL color to match architectural requirements or utility color-coding standards
- Arbitrary Color Matching: Unlike painted steel enclosures where custom colors require specialized painting processes and are prone to fading and chipping, the MLX-2000 can be manufactured in any required color using UV-stable, lightfast pigmented material that maintains its appearance for the full service life without fading, chalking, or requiring repainting
- Long Service Life: The combination of corrosion immunity, UV stability, impact resistance, and thermal stability provides a service life exceeding 20 years under normal operating conditions — significantly outlasting painted steel enclosures in most outdoor and underground applications
Applications
- Residential buildings — lighting and power terminal distribution
- Industrial plants — machine power and workshop lighting
- Shopping malls and commercial centers — lighting and socket outlet distribution
- Office buildings — floor-level terminal distribution
- Mines and industrial facilities — general power distribution
- Utility power supply — underground cable termination and distribution
- Infrastructure — road lighting, tunnel power supply, and public facility distribution