China Circuit Breaker Meter Box Manufacturers & Supplier

Our non-metallic meter boxes are manufactured from hot compression-molded Sheet Molding Compound (SMC), which combines unsaturated polyester resin, 25-30% chopped electrical-grade glass fibers, and inorganic mineral fillers. SMC exhibits an exceptional dielectric breakdown strength exceeding 12 kV/mm and a Comparative Tracking Index (CTI) rating of CTI 600M.

This creates an inherent Class II insulation barrier: even if an uninsulated phase conductor detaches inside the box and contacts the inner enclosure walls, zero phase potential is transferred to the outer surface. Consequently, operating personnel, residents, and utility inspection crews are fully protected against indirect touch-voltage shock risks without relying on protective earthing conductors.

Under continuous outdoor installation conditions exposed to solar UV radiation and atmospheric moisture, the design lifespan of our TY-SXD and TY-SXS SMC enclosure series exceeds 30 years; for indoor installations, it exceeds 40 years. This longevity is verified via accelerated aging tests in Xenon arc weathering chambers per ISO 4892-2 (equivalent to 3,000+ hours of continuous UV exposure with negligible color shift and retention of >80% baseline tensile strength).

Unlike standard unreinforced ABS or standard polypropylene which embrittles in under 5 to 7 years in tropical or desert regions, SMC thermoset molecular polymers do not melt, flow, or experience chain scission under high ambient solar loads.

Our three-phase commercial and industrial energy meter boxes (such as the TY-SXS1 and TY-SXS2 series) are designed with busbar support structures rated for a rated short-time withstand current (Icw) of 30 kA for 1 second, with an associated peak withstand current (Ipk) surpassing 63 kA.

The rigid SMC composite chassis has a flexural strength >120 MPa, preventing internal busbar electrodynamic deflection during prospective line-to-earth or three-phase bolted faults. In addition, the material is certified UL94-V0 flame retardant and meets the 960°C Glow Wire Test (IEC 60695-2-11), ensuring that internal arc ignition self-extinguishes within 5 seconds without dripping molten droplets.

Yes. Zhejiang Teyi Electric has extensive experience serving overseas EPC contractors and local concessionaires bidding on utility grid upgrades. Through our complete OEM/ODM development protocol, we adapt dimensions, window locations, smart meter mounting studs, locking hasps, cable glands, and laser-engraved utility asset emblems.

Our engineering department operates advanced 3D CAD/CAM software (SolidWorks, UG/NX), allowing custom steel compression mold tooling design and physical sample fabrication for client testing and homologation within tight tender deadlines.

Direct-entry metering boxes (such as the TY-SXD1 or direct three-phase models) route the full load current directly through the terminal blocks of the revenue meter. These are typically limited to residential and light commercial loads where the maximum phase current does not exceed 60A to 100A.

Transformer-type meter boxes (such as our TY-SXS3 series or CT-operated stainless steel cabinets) are required for larger loads (typically 100A to 630A and above). In these systems, primary current transformers (CTs with 5A or 1A secondary outputs) step down the high phase currents. The enclosure includes dedicated compartments for CT mounting, test terminal blocks (TTBs) with shorting clips, and secondary control wiring conduits, ensuring safe testing without disconnecting consumer service.

Export packaging complies with international seafreight standards to withstand multi-week oceanic transits through high humidity marine zones. Each meter box is wrapped in dustproof polyethylene film with desiccant packets, protected with molded EPS foam corner buffers, and packed in reinforced multi-wall corrugated cartons.

For container-load and LCL shipments, units are palletized on fumigated heat-treated wooden or durable plastic pallets, wrapped in heavy stretch wrap with strapping bands, and edge-protected to eliminate vibration chafing and compression deformation during high-seas transit.