High voltage (HV) circuit breakers are the giants of the electrical grid, protecting transmission lines and transformers. The high voltage circuit breaker market is for devices rated above 72.5 kV. The high voltage circuit breaker market for "SF6" is the dominant technology, due to its excellent insulating and arc-quenching properties. The high voltage circuit breaker market for "dead tank" and "live tank" designs are both used. The high voltage circuit breaker market for "SF6-free" alternatives (clean air, vacuum, or new gas mixtures) are being developed, but are not yet widely deployed at the highest voltages.

The broader circuit breaker market includes this segment. The high voltage circuit breaker market for "GIS" (gas-insulated switchgear) incorporates breakers and other equipment in a sealed SF6 enclosure, saving space. The high voltage circuit breaker market for "AIS" (air-insulated switchgear) is more traditional, with breakers mounted in open air. The high voltage circuit breaker market for "hybrid" switchgear combines GIS and AIS.

The high voltage circuit breaker market for "operating" mechanisms for HV breakers are typically hydraulic or spring. The high voltage circuit breaker market for "closing" resistors and "pre-insertion" resistors are used to limit switching surges. The high voltage circuit breaker market for "capacitive" current switching (e.g., for capacitor banks) is a specialized duty.

The high voltage circuit breaker market for "DC" breakers (for HVDC transmission) are a separate, emerging segment. HVDC breakers must interrupt DC current, which has no natural zero crossing. The high voltage circuit breaker market for "hybrid" (mechanical + power electronics) and "solid-state" DC breakers are being developed.

Looking ahead, the high voltage circuit breaker market will see the gradual phase-down of SF6 due to environmental regulations. The high voltage circuit breaker market for "vacuum" interrupters are being scaled up to higher voltages. The high voltage circuit breaker market for "clean air" (using compressed air) is a promising SF6-free alternative.

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