General Description:
The Outdoor Vacuum Circuit Breaker (Dog-house) by Ningbo Dowei Electric Co., Ltd. complies with international standards such as IEC 62271, ANSI/IEEE Std C37, and NEMA. It is certified by ISO 9001, KEMA, CESI, CE, TUV, UL, and ASTA. The design includes seismic considerations per ETGI-1.020 and IEEE Std 693, and structural design standards like ASTM A325 and ANSI/AISC 360. It is suitable for high altitudes up to 5000m, featuring porcelain bushings with extended creepage for higher Basic Insulation Level (BIL) and multi-ratio bushing-type Current Transformers (CTs) for measurement and protection. The standard configuration includes two opening coils and one closing coil, offering high current switching capability and reliable, flexible solutions.

Typical Specification:
The breaker is an outdoor dead tank type with rated voltages of 15, 27, and 38 kV. It supports rated currents of 600, 800, 1200, 2000, and 3000 A, and operates at frequencies of 50/60 Hz. The rated insulation levels include power frequency withstand voltages of 50, 60, and 70 kV, and lightning impulse withstand voltages (BIL) of 95, 150, and 170 kV. The rated short circuit breaking current ranges from 20 to 40 kA, with a short time withstand current of the same range for 4 seconds. The peak withstand current is between 50 and 125 kA. The operating mechanism is a motor drive spring mechanism, with a rated operating sequence of O-0.3s-CO-180s-CO for Isc < 40kA and O-180s-CO-180s-CO for Isc = 40kA. It has an electrical endurance level of E2 (IEC62271-100) and a mechanical endurance of 10,000 operations. The rated auxiliary control voltage options are AC220/110 and DC220/110. Opening times range from 20 to 60 ms, arcing times from 10 to 15 ms, full opening times from 30 to 65 ms, and closing times from 35 to 70 ms. The Internal Arc Classification (IAC) level is AFLR 25kA/1s or 31.5kA/1s, and the enclosure protection level is IP55.