Circuit Breaker Selection

1) direct contact with the electric shock protection
Direct contact with an electric shock hazard due to relatively large, causing serious consequences, so to use high sensitivity leakage circuit breakers for power

tools, portable electrical equipment and temporary line, you should install the operating current in the loop is 30mA, operation time within 0.1s

Leakage circuit breaker. More on residential appliances, preferably into the household energy meter installed in the rear.
If once the shock easily cause secondary damage (eg aerial work), you should install the operating current in the loop is 15mA, operating time within the US leakage

circuit breaker. For electrical medical equipment in hospitals, operating current should be installed as 6mA, the US's action time

The leakage circuit breaker.
2) indirect contact electric shock protection
Different places indirect contact electric shock, can cause varying degrees of bodily harm, therefore, should be installed in different places different leakage

circuit breaker. The dangers of electric shock for easy larger place, require relatively high sensitivity of leakage circuit breaker. In humid areas than in the

Dry place much greater risk of electric shock, the general should be installed as the operating current 15-30mA, operation time within 0.1s leakage circuit breaker.

For water, electrical equipment should be installed movements. Current of 6 - l0mA, operating time in US leakage circuit breaker within

. The operator must stand on metal objects or metal container for electrical equipment, as long as the voltage is higher than 24V, you should install the operating

current of 15mA or less operating time within the US leakage circuit breaker. Voltage of 220V or 380V for fixed electrical equipment, when

Enclosure grounding resistance 500fZ below, can be installed stand-alone operating current of 30mA, operating time within 0.19 leakage circuit breaker. 100A rated

current at more large electrical equipment or electrical equipment with multiple power supply circuit, operating current can be installed as

50 - 100mA earth leakage Circuit breaker ,  grounding resistance for electrical equipment below 1000, you can install the operating current of 200-500mA earth leakage

circuit breakers.