High Voltage Circuit Breakers
SF6 gas-insulated, oil, and dead tank circuit breakers for transmission substations and high voltage power systems.
High Voltage Breaker Types
SF6 Live Tank Circuit Breakers
69kV - 500kV at 2000A - 4000AGas-insulated breakers with interrupters mounted on insulators above ground level.
Applications
Key Advantages
- Compact footprint
- Low maintenance
- High reliability
- Excellent interrupting performance
Popular Models
ABB LTB • Siemens 3AP • GE/Alstom GL • Hitachi
SF6 Dead Tank Circuit Breakers
72.5kV - 550kV at 2000A - 5000AGas-insulated breakers with interrupters enclosed in grounded metal tanks at ground level.
Applications
Key Advantages
- Safe ground-level maintenance
- Integral CTs
- Easy bushing replacement
- Seismic resistant
Popular Models
Siemens 3AP1 • ABB DTC • GE/Alstom FP • Mitsubishi
Oil Circuit Breakers (High Voltage)
69kV - 230kV at 1200A - 2000ALegacy breakers using oil for arc extinction, still in service at many substations.
Applications
Key Advantages
- Proven technology
- Parts available
- Can be reconditioned
- Cost-effective maintenance
Popular Models
GE FK • Westinghouse • ITE HK • Allis-Chalmers
Gas-Insulated Switchgear (GIS)
72.5kV - 550kVComplete SF6-insulated substation equipment including breakers, disconnects, and busbars.
Applications
Key Advantages
- Extremely compact
- Weather independent
- High reliability
- Long service life
Popular Models
ABB ELK • Siemens 8DN • GE/Alstom ELK • Hitachi
Available Inventory
Siemens 3WL SF6 Circuit Breaker
Siemens 3AP1 Dead Tank
ABB LTB 145 Live Tank
Westinghouse 115kV Oil Breaker
High Voltage Breaker Services
Specialized testing and maintenance services for transmission-class equipment.
SF6 Gas Analysis
Moisture, purity, and decomposition product testing to ASTM standards.
Timing & Travel Testing
High-speed digital analysis of breaker operating characteristics.
Dielectric Testing
AC/DC hi-pot testing up to 500kV for insulation verification.
Mechanism Overhaul
Complete spring or hydraulic mechanism rebuild and adjustment.
Need High Voltage Equipment Support?
Our utility specialists have decades of experience with transmission-class breakers. Contact us for equipment sourcing, testing, or field service.