First, an overview

ZN - -27.52000-31.5 type single-phase electric railway indoor vacuum circuit breaker (hereinafter referred to as the circuit breaker).

The circuit breaker is a single-phase AC 50Hz indoor power distribution device, applicable in electrified railway traction substation, the divisional booth and opening and closing, as the control switch and fault protection switch.

Two, the use of environmental conditions

A. ambient temperature: -25 degrees to +40 degrees.

B. air relative humidity: daily average of less than 95%, the average daily average of not more than 90%. water vapor is not greater than 2.2X10-3Mpa, the average of not more than 1.8X10-3Mpa.

C. altitude: the ordinary type does not exceed 1000m, the plateau type does not exceed 3000m.

D. atmospheric conditions: there should be no serious impact on the contamination and corrosion of the products, explosive medium.

E. installation site: there should be no serious impact on the vibration and bumps.