The flameproof enclosure of an electrical device loses its explosion resistance or flameproofness (ie, does not have a detonation) or is explosive. Common detonation phenomena in underground explosion-proof electrical equipment are:
1. The flameproof casing is severely deformed or cracked, the weld is welded and the connecting screws are incomplete, the screw is damaged or the screwing depth is less than the specified value, so that the mechanical strength does not meet the requirements of the explosion resistance and the explosion occurs;
2. The explosion-proof joint surface is seriously corroded, due to mechanical damage, the gap exceeds the specified value, there is a pit, the connecting screw is not pressed, etc., and the explosion is not reached;
3. There is no qualified sealing rubber ring at the entrance and exit of the cable or no sealing rubber ring at all; the unused cable wiring hole does not use a qualified sealing baffle or no sealing baffle at all, causing detonation;
4. Arbitrarily increase the electrical elements and components in the equipment casing, so that some electrical distance is less than the specified value, or the insulation is damaged, the arc extinguishing device fails, causing the phase to be short-circuited by the arc of the casing, causing the casing to be blown through by the short-circuit arc and detonating;
5. The two explosion-proof chambers in the outer casing are connected due to the burning of the binding posts and the wiring sleeves, and the pressure is superimposed during the internal explosion, resulting in the explosion of the outer casing. The explosion of the outer casing is mainly due to the failure of the installation and inspection quality to meet the standard requirements and the use and maintenance. Improperly caused by the original. Therefore, the requirements of the explosion-proof quality standards must be strictly guaranteed. In the installation, use, maintenance and overhaul, the relevant regulations and standards must be strictly implemented to prevent the explosion.
KNB1-100 Miniature Circuit Breaker
KNB1-100 Mini Circuit breakers, also named as the air switch which have a short for arc extinguishing device. It is a switch role, and also is a automatic protection of low-voltage electrical distribution. Its role is equivalent to the combination of switch. Fuse. Thermal Relay and other electrical components. It mainly used for short circuit and overload protection. Generally, According to the poles, mini Circuit breaker can be divided into 1P , 1P+N , 2P, 3P and 4P.
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