Work environment:

a、 Maximum ambient temperature:+ 40℃;
b、 Minimum ambient temperature:- 25℃;
c、 Relative humidity of the air: 90%;
d、 The altitude does not exceed 2000 meters and complies with IEC947-4-1.

Installation conditions:

Resistors are allowed to be stacked. In order not to reduce their capacity, the stacking of resistors should not exceed four boxes. If it is necessary to stack more than four boxes, a steel structure frame must be used to support it. In order to achieve good heat dissipation effect of the resistor, the bottom of the resistor should be installed with a minimum distance of 100mm from the ground.