QDS7 series electric locomotive DC fast circuit breakerDetailed product description：

The QDS7 series DC fast circuit breaker for electric locomotives is suitable for short-circuit and overload protection in DC circuits with a rated current of 2000A and below in coal mines, mines, and industrial and mining electric locomotives.

Model and its meaning:

Main technical parameters:

Rated voltage UeV	Maximum operating voltage V	Set current range A	Breaking ability (KA) six (di/dt=3×10 A/S)	Overvoltage during disconnection/test voltage	Full break time (ms)	Mechanical lifespan (times)	Rated breaking capacity (times)
one thousand and five hundred	one thousand and eight hundred	（0.8-2)Ie	thirty	≤3	≤30	twenty thousand	2Ie，180