Zhejiang Donghua Electrical Appliance Co., Ltd.
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DH1(VS1)-12 Indoor High‑Voltage Vacuum Circuit Breaker

DH1(VS1)-12 Indoor High‑Voltage Vacuum Circuit Breaker

General Description

Model DH1(VS1)‑12 Indoor High‑Voltage Vacuum Circuit Breaker is indoor switchgear for three‑phase AC 50 Hz, 12 kV rated‑voltage power systems. It serves as protection and control units for power grid facilities and power equipment in industrial and mining enterprises. It is suitable for applications requiring frequent operations under rated operating current, or locations where short‑circuit currents need to be interrupted repeatedly.

This circuit breaker adopts an integrated design of operating mechanism and breaker main body. It can be used as a fixed‑mounted unit, or equipped with a dedicated propelling mechanism to form a withdrawable truck‑mounted unit.

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    Outline and Installation Dimension Drawing
    Outline and Installation Dimension Drawing

    No. Item Unit Specification
    1 Rated Voltage kV
    2 Rated Power Frequency Withstand Voltage (1 min) kV 42/48 (Phase-to-earth / Across open contacts)
    3 Rated Lightning Impulse Withstand Voltage (Peak) kV 75/85 (Phase-to-earth / Across open contacts)
    4 Rated Frequency Hz 50/60
    5 Rated Current A 630, 1250 / 630, 1250, 1600, 2000, 2500, 3150 / 630, 1250, 1600, 2000, 2500, 3150
    6 Rated Short-circuit Breaking Current kA 20/25 / 31.5 / 40
    7 Rated Short-time Withstand Current kA 20/25 / 31.5 / 40
    8 Rated Short-time Withstand Duration s 4
    9 Rated Peak Withstand Current kA 50/63 / 80 / 100
    10 Rated Short-circuit Making Current (Peak) kA 50/63 / 80 / 100
    11 Secondary Circuit Power Frequency Withstand Voltage (1 min) V 2000
    12 Rated Single Capacitor / Back-to-back Capacitor Bank Breaking Current A 630/400 (40kA: 800/400)
    13 Rated Capacitor Bank Switching Current A 12.5 (Frequency ≤ 100Hz)
    14 Mechanical Endurance Operations 20000
    15 Rated Short-circuit Breaking Operations (Electrical Life) Operations 20000
    16 Rated Short-circuit Current Breaking Operations Operations 50 (40kA ≤ 30)
    17 Contact Overtravel mm 3
    18 Energy Storage Time s ≤10
    19 Contact Opening Distance mm 11±1
    20 Contact Stroke mm 3.5±0.5
    21 Closing Contact Bounce Time ms ≤2 (40kA ≤3)
    22 Three-phase Closing/Open Synchronism ms ≤2
    23 Average Closing Speed (Contact Opening 8mm) m/s 1.1±0.2
    24 Average Opening Speed (Contact Closing 8mm) m/s 6.0±0.2
    25 Main Circuit Resistance μΩ ≤50 (630A) ≤45 (1250A) / ≤40 (1600,2000A) ≤35 (2500A and above)
    26 Rated Operating Sequence O-0.3s-CO-180s-CO