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VD4M 1206-25，12kV

The ABB VD4M 1206-25 is a Medium Voltage (12kV), Fixed-mounted Vacuum Circuit Breaker from ABB's renowned VD4 series. It is a spring-operated, indoor vacuum circuit breaker designed for primary switching, protection, and control in medium voltage power distribution networks. It is typically installed in metal-clad or air-insulated switchgear for use in utility substations, industrial plants, and large commercial facilities.

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Technical Parameters Parameter Description / Value Product Series ABB VD4 Type Fixed-mounted, Spring-operated Vacuum Circuit Breaker Rated Voltage (Ur) 12 kV Rated Frequency 50/60 Hz Rated Normal Current (Iu) 1200 A Rated Short-Time Withstand Current (Ik) 25 kA (for 3 seconds, typically) Rated Short-Circuit Breaking Current (Isc) 25 kA Rated Making Current 62.5 kA (peak) Rated Lightning Impulse Withstand Voltage (Up) 75 kV (across open contacts) Rated Power-Frequency Withstand Voltage (1 min) 28 kV Interrupting Medium Vacuum Operating Mechanism Spring stored-energy mechanism Mechanical Endurance Typically ≥ 10,000 operations Electrical Endurance (at Isc) Typically ≥ 30 operations at full rated short-circuit current Control Supply Voltage Standard options: DC 24V, 48V, 110V, 220V; AC 110V, 220V. (Specific to order.) Standards IEC 62271-100, ANSI/IEEE C37.04, C37.06, C37.09 Typical Applications Incoming/outgoing feeders in primary distribution substations, transformer protection, large motor switching.