High-current current-limiting circuit breaker with quick isolator

Product Introduction

KGQ1 series blasting cutting type fast isolator is the core component of DDXK1 series high-current current limiting circuit breaker/DGXK1 series large-capacity high-speed switch, which flows over the load current as the main electrical circuit during normal operation, and opens the multi-series break of its leading circuit at high speed when a short circuit fault occurs, forming an insulation break with high insulation strength. The seal is explosion-proof, and the user replaces it after the action, and the manufacturer provides users with spare parts for a long time at a favorable price.

Feature

• Rapid Isolation Response：The quick isolator activates within 1-3ms after the circuit breaker interrupts faults, mechanically separating the faulty section from the grid to prevent backfeed, ensuring personnel safety during inspections or repairs.
• High Current Handling with Precision Limiting：Rated current up to 6300A, limits peak short-circuit current to 15-45% of the prospective value, protecting transformers, generators, and cables from thermal/mechanical damage while maintaining system stability.
• Interlocking Safety Mechanism：Integrates mechanical and electrical interlocks between the circuit breaker and isolator, preventing incorrect operations (e.g., isolator opening under load) and complying with IEC 62271-203 safety standards.
• Compact Design for Flexible Installation：Slim structure (width ≤800mm) fits into standard KYN28/XGN switchgear, supporting both standalone and cabinet-mounted setups. Compatible with AC/DC grids, ideal for industrial parks, substations, and generator outlets.
• Low Maintenance Requirements：Isolator uses wear-resistant silver contacts with a 10,000+ operation lifespan; self-diagnostic sensors monitor contact status and drive mechanisms, reducing unplanned downtime.

Main parameters

• Rated voltage: 7.2~40.5kV
• Rated current: 630~6300A
• Breaking time: 150~300μs