| Breaking Capacity: | Low Voltage Circuit Breakers |
|---|---|
| Operation: | Manual Type |
| Speed: | Normal Type Circuit Breaker |
| Arc-extinguishing Medium: | Air |
| Installation: | Fixed |
| Structure: | MCCB |
| Samples: |
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| Customization: |
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Audited Supplier The molded case circuit breaker can cut off the current automatically when the current exceeds the trip setting. Plastic shell refers to the plastic insulator used as the shell of the device to isolate the conductors and the grounded metal part. Molded case circuit breakers usually contain thermomagnetic trip units, while large molded case circuit breakers will be equipped with Solid-state trip sensors. The trip unit is divided into thermal magnetic trip and electronic trip
working principle:The main contact of LV circuit breaker is closed by manual operation or electric operation. After the main contact is closed, the free tripping mechanism locks the main contact in the closing position. The coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit, and the coil of the undervoltage release and the power supply are connected in parallel.
When the circuit is short circuited or seriously overloaded, the armature of the over-current release is engaged to make the free release mechanism act and the main contact opens the main circuit.When the circuit is overloaded, the hot element of the thermal release causes the bimetal sheet to bend, which pushes the free release mechanism to act, and the main contact disconnects the main circuit.When the circuit is undervoltage, the armature of the undervoltage release also makes the free release mechanism act and the main contact opens the main circuit. When the shunt release button is pressed, the armature of the shunt release is engaged to make the free release mechanism act and the main contact opens the main circuit
| Technical specifications | |
| Protect grade | IР20 |
| Mounting | Screw bolt |
| Section Cable , мм2 | Rated current 31,5А - 2,5...95 |
| Rated current 250А - 50...185 | |
| Rated current 400А - 95...240 | |
| Number Poles | 3 |
| Rated current, А | 250 |
| Seting of the electromegnetic Release Ir1 (A) | ВА 51-35 - 16; 20; 25; 31,5; 40; 50; 63; 80; 100; 125; 160; 200; 250; 320; 400 |
| Seting of the electromegnetic Release Iр | ВА 51-35 |
| AC - 12In | |
| DC - 6; 8; 10 In (by requirment ) | |
| 16-25А - 320А | |
| 31,5-50А - 630А | |
| 63-125А - 1250А | |
| 160А - 2000А | |
| 200-250А - 2500А | |
| Rated Voltage V | AC - 380/660 |
| DC - 220/440 | |
| Limiting circuit-breaking ability,Icu кА | |
| 400V | 50 |
| 690V | 25 |
| Operating circuit-breaking ability Ics kA | |
| 400V | 35 |
| 690V | 15 |
| Protect grade IP | 20 |
| Electrical life | 12500 |
| Mechenical life | 20000 |
| Temperature | -50.0 ºC-+ 50.0 ºC |
| Maximum working temperature | 50.0 (ºC.) |
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