Bohai Electromechanical Technology Group Co., Ltd., a subsidiary of Zhejiang Liange Electric Technology Co., Ltd., was established in 2006 as a national high-tech enterprise specializing in the R&D, manufacturing, and distribution of complete accessory components for high-voltage ring main units (RMUs).
Bohai Electromechanical boasts a highly skilled technical team, with over 400 employees, including 30 technicians and 19 R&D personnel.
We offer comprehensive ODM services backed by vertically integrated manufacturing infrastructure, including precision metal processing (CNC machining, stamping, laser cutting, milling), mold design & fabrication, and injection molding workshops. This enables end-to-end capabilities from prototyping to mass production. Specializing in low & medium voltage electrical applications, we support flexible low-volume customization while maintaining scalability for high-volume orders. Our solutions are engineered to meet evolving demands in smart grid systems, renewable energy integration, and other mission-critical industries. Additionally, our company is equipped with a variety of advanced testing equipment, such as coating thickness gauges, mechanical characteristic testers, and voltage withstand test devices, ensuring that every product undergoes rigorous quality inspections. We are committed to providing customers with stable and reliable high-quality products.
| Main Technical Parameters |
| Item | Unit | Circuit Breaker Unit | Load Switch Unit | Switch-fuse Combinations Unit |
| Rated Voltage | kV | 12 | 12 | 12 |
| Rated Frequency | Hz | 50 | 50 | 50 |
| Rated Current | A | 630/1250 | 630/1250 | Dependent on Fuse Current Rating |
| Rated Insulation Level | Power Frequency Withstand Voltage(Phase-to-Phase/Phase-to-Ground) | kV | 42 | 42 | 42 |
| Power Frequency Withstand Voltage(Vacuum Interrupter/ lsolation Gap) | 48 | 48 | 48 |
| Power Frequency Withstand Voltage(Control and Auxliary Circuits) | 2 | 2 | 2 |
| Lightning Impulse Withstand Voltage(Phase-to-Phase/Phase-to-Ground) | 75 | 75 | 75 |
| Lightning Impulse Withstand Valtage(Vacuum lnterrupter / lsolation Gap) | 85 | 85 | 85 |
| Rated Short-Time Withstand Current | kA | 20(25)/4S | 20(25)/4S | _ |
| Rated Peak Withstand Current | kA | 50(63) | 50(63) | _ |
| Rated Short-Circuit Making Current | kA | 50(63) | 50(63) | Limited by High-Voltage Fuse |
| Rated Short-Circuit Breaking Curent | kA | 20(25) | 20(25) | Limited by High-Voltage Fuse |
| Rated Transfer Current | A | _ | _ | 1700 |
| Rated Active Load Breaking Cument | A | _ | _ | _ |
| Rated Closed-Loop Breaking Current | A | 630 | 630 | _ |
| Internal Arc Fault Test (AFLR Class) | kA/S | 20(25)/0.5S | 20(25)/0.5S | _ |
| Partial Discharge (at 1.2Ur) | PC | ≤10 | ≤10 | _ |
| Ingress Protection (IP) Rating (Cabinet) |
| IP4X | IP4X | IP4X |
| Main Circuit Resistance | μΩ | ≤120 | ≤120 | _ |
| Mechanical Endurance | Circuit Breaker / Load Switch | Times | 10000 | 10000 | 10000 |
| Disconnector/Grounding Switch | 3000 | 3000 | 3000 |
