Molded Case Circuit Breaker Information
- Model: ATO-ABE-203b
- Rated Current: 250 amp
- Rated Voltage: 380/415V AC, 50Hz/ 60Hz
- Number of poles: Three pole
- 50 kA short circuit interrupting capacity
||10A, 15A, 20A, 30A, 40A, 50A, 60A, 75A, 100A
|Numbers of Poles
|Rated Operating Voltage
|Rated Insulated Voltage(Ui)
|Ultimate Short Circuit Breaking Capacity, Icu
Dimension (Unit: mm)
Tips: The Characteristics of Molded Case Circuit Breaker.
1. Current limiting and breaking capacity
When the circuit breaker is short-circuited, the contacts quickly open to produce an arc, which is equivalent to inserting a rapidly increasing arc resistance in the line, thus limiting the increase of the fault current. The shorter the opening time of the circuit breaker, the closer Ics is to Icu, and the better the current limiting effect. It can also greatly reduce the electromagnetic effect, electric effect and thermal effect caused by short-circuit current on the circuit breaker and electrical equipment, and prolong the circuit breaker's service life.
2. Short circuit protection
Short-circuit protection is the instantaneous tripping of short-circuit. Pay attention to adjusting the protection setting value in time after the load changes, to prevent the setting value from being too small and frequent tripping that affects the quality of power supply, or the setting value is too high to prevent effective protection of lines and equipment.
3. Overload delay protection
Overload delay protection means that the load current exceeds the limit of the equipment and there is a danger of burning the equipment. The protection device can cut off the power supply within a certain period of time. Overload has a process of heat accumulation, and the protection action does not need to be too fast. For short-time overcurrent, the protection should not act.
4. Isolation function
The isolation function is to require that the leakage current after the circuit breaker is disconnected will not cause harm to people and equipment. After multiple short-circuit trips, the performance of the switch will decrease and the leakage current will increase. For the human body, a leakage current of less than 30mA is a safe leakage current, and in a harsh environment, a leakage current exceeding 300mA for more than 2 hours may cause a phase-to-ground short circuit due to insulation damage and cause a fire.
5. Leakage Protection
There are two types of leakage devices, thermal magnetic type and electronic type. In comparison, electronic leakage devices have the advantages of small size, high precision and high sensitivity, but their anti-interference ability is poor. At present, electronic leakage protectors dominate the mainstream. When the leakage current reaches the set value, the executive circuit receives the induced voltage signal on the secondary side of the zero-sequence current transformer, drives the conversion contact to output the leakage protection signal, and causes the trip unit to act and cut off the power supply.