Hitachi has studied and improved the direct current circuit breakers of various methods since we developed and delivered the DC high-speed air circuit breaker.
In 1987, we developed DC circuit breaker applied the vacuum interrupter for the railroad for the first time in the world. We have delivered many circuit breakers to the major private and public railroad up to the present.
Our sophisticated technology and outstanding development capability realize the advanced, reliable, safe, user-friendly and sturdy DC circuit breaker. Hitachi contributes the electric railroad system demanded to the safer service through HSVCB which is unique to us.
| Normative standard | JEC-7152 (1991) | IEC61992-1, 2 (2006) |
|---|---|---|
| Rated voltage | DC 750V / 1500V | DC 900V / 1800V |
| Rated service current | 3,000A / 4,000A | 3,150A / 4,000A |
| Rated making and breaking capacity | 50kA (at 3×106A/s) / 100kA (at 10×106A/s) |
31.5kA |
| Rated track time constant | - | 31.5ms |
| Setting range of releases | 4kA ～ 12kA | 4kA ～ 12kA |
| Driving method | Hybrid type electromagnetic actuator & Magnetic repulsion coil | |
| Breaking method | Commutation with commutating capacitor | |