General

YCM7YV series electronic plastic case circuit breaker (hereinafter referred to as: circuit    breaker) is suitable for low-voltage power grids with AC 50Hz, rated insulation voltage   800V, rated operating voltage 400V and below, and rated operating current up to 800A. The circuit breaker has overload long-delay inverse time limit, short-circuit short-delay   inverse time limit, short-circuit short-delay fixed time limit, short-circuit instantaneous    and under-voltage protection functions. Under normal circumstances, the circuit

breaker is used for infrequent switching of circuits and infrequent starting of

motors.This series of circuit breakers has isolation function, and its corresponding symbol is "      "

Standard: IEC60947-2.

Operating conditions

1. Ambient air temperature

a)The upper limit value does not exceed +40℃;

b)The lower limit value does not exceed -5℃;

c)The average value over 24 hours does not exceed +35℃;

2. Altitude

The altitude of the installation site does not exceed 2000m.

3. Atmospheric conditions

The relative humidity of the atmosphere does not exceed 50% when the ambient

maximum temperature is +40°C; it can have higher relative humidity at lower

temperatures; when the monthly average minimum temperature of the wettest

month is +25°C, the monthly average maximum temperature of the month is +25°C. The relative humidity is 90%, taking into account condensation that occurs on the

product surface due to temperature changes.

4. Pollution degree

Pollution degree 3, the accessories installed in the circuit breaker have a pollution degree 2.

5. Installation category

The main circuit of the circuit breaker shall be installation category III, and the auxiliary circuit and control circuitshall be installation category II.

6. Installation conditions.

Circuit breakers should generally be installed vertically, usually with upward wiring,   and the external magnetic field at the installation site should not exceed 5 times the geomagnetic field in any direction.