| Parameter | Value | | :--- | :--- | | | 72.5 – 170 kV | | Rated Continuous Current | Up to 3150 A | | Rated Short-Circuit Breaking Current | Up to 40 kA | | Rated Frequency | 50/60 Hz | | Number of Breaks Per Pole | 1 | | Operating Mechanism Type | BLK 222 (Spring-operated) | | Closing Time | < 65 ms | | Opening Time | 22 ms | | Break Time | 40 ms | | Short-circuit Duration | 3 s |
The serves as the definitive reference document for installing, operating, and maintaining the widely deployed Hitachi Energy (formerly ABB) high-voltage sulfur hexafluoride (SF6) live tank circuit breaker . Engineered for utility grids and industrial substations, this manual provides critical guidelines for managing the breaker across its rated voltage spectrum of 72.5 kV to 170 kV . Adhering strictly to the technical protocols in this document ensures electrical network safety, optimal arc extinction, and long-term mechanical reliability. ltb 72.5-170d1 b manual
Lockout/tagout procedures and grounding requirements. Conclusion | Parameter | Value | | :--- | :--- | | | 72
Additional support and information can be obtained from the manufacturer's website, customer support hotline, or authorized service centers. Lockout/tagout procedures and grounding requirements
Three weeks later, the grid operator announced an “unprecedented safety review” of all LTB series breakers. Jacek was never formally thanked. But at night, when the wind blew through the decommissioned yard, he swore the old transformer hummed in a minor key—like a ghost finally at rest.
But Jacek knew the truth. The official report blamed operator error. The unofficial one? A missing page from this very manual—section 7.4.2, which described a rare interlock failure in the LTB 72.5-170D1 B when ambient humidity exceeded 85% during winter load shedding.
Understanding the mechanical build described in the manual is key to safe operation: