Pole-mounted circuit breaker Manufacturer & Manufacturers

An overhead Load Break Switch (LBS) is strictly rated to interrupt nominal operational load currents (typically 400A or 630A) and can close into a fault, but it cannot interrupt short-circuit currents. A Pole-Mounted Circuit Breaker / Auto-Recloser integrates a high-capacity vacuum interrupter capable of extinguishing symmetrical and asymmetrical fault currents up to 16kA, 20kA, or 25kA. Furthermore, auto-reclosers possess autonomous micro-processor controls programmed for multi-shot reclosing sequences (e.g., O - 0.3s - CO - 2s - CO - 30s - CO), effectively clearing 80% to 90% of transient overhead faults caused by lightning, foliage, or bird strikes without permanent feeder blackouts.

Traditional installations rely on standalone circuit breakers wired via discrete outdoor terminal blocks to external current transformers, external voltage transformers, and a separately wired RTU enclosure. This exposed architecture invites insulation breakdown, loose terminal connections, phase error drifts, and moisture ingress. "Primary and Secondary Fusion" integrates miniaturized electronic sensors (electronic current sensors and capacitive dividers) factory-cast directly within the solid epoxy breaker poles, factory-calibrated as a unified entity with an intelligent terminal unit (FTU/TTU). This architecture delivers plug-and-play field installation, eliminates CT open-circuit flash risks, cuts line losses, and provides precision sensing down to 0.5% error.

Solid dielectric encapsulation utilizing Hydrophobic Cycloaliphatic Epoxy (HCEP) addresses three core vulnerabilities of SF6 gas-insulated reclosers: First, SF6 is the most potent greenhouse gas known, subject to severe taxation, reporting burdens, and looming statutory bans across the European Union and North America. Second, SF6 breakers require pressure gauges, seal gaskets, and regular gas maintenance; any leak leads to catastrophic dielectric failure and line outages. Third, under severe cold conditions, SF6 liquefies, severely compromising breaking capacity. Solid dielectric systems are completely dry, immune to gas leakage, and operate flawlessly between -45°C and +70°C.

Our intelligent FTU and TTU control pods natively support all dominant utility communication standards: IEC 60870-5-101 (serial), IEC 60870-5-104 (Ethernet/TCP-IP), DNP3.0 (serial and IP), Modbus RTU/TCP, and native IEC 61850 with GOOSE messaging for peer-to-peer inter-recloser automation without master station lag. Physical interfaces include RS-232, RS-485, RJ45 Ethernet, and optional optical fiber ports, with seamless plug-in compatibility for 4G/5G private cellular modems, satellite transceivers, or VHF/UHF radio sets.

Yes. Through our specialized OEM/ODM engineering division, we supply hot-dip galvanized mounting structures fabricated to withstand local wind loads (up to 160 km/h) and seismic stresses. We provide single-pole channel frames, double-pole platform substructures, surge arrester integration brackets, and disconnector-recloser combined frames engineered to mate precisely with pre-drilled utility pole standards worldwide.

Every manufactured pole-mounted circuit breaker undergoes 100% factory routine testing in accordance with IEC 62271-100 and IEEE C37.60 before packing. Routine tests include: Power Frequency Dielectric Dry Withstand Test (typically 42kV or 72kV for 1 minute), Main Circuit Resistance Measurement (≤ 40 micro-ohms), Mechanical Timing Analysis (Contact opening time, closing time, bouncing duration, synchronicity across three phases), Vacuum Interrupter Integrity Test, Partial Discharge testing (< 10 pC at 1.2 Ur), and complete end-to-end functional relay calibration across overcurrent, earth fault, and reclosing sequences.