Explosion-proof circuit breaker refers to a device used in hazardous locations where flammable gases and dust exist. It can prevent arcs, sparks, and high temperatures that may be generated inside the explosion-proof circuit breaker from igniting the surrounding flammable gases and dust, thereby meeting explosion-proof requirements. Different flammable gas mixture environments have different requirements for the explosion-proof level and type of explosion-proof lights.
Product Features
1. The explosion-proof circuit breaker has a cast aluminum alloy shell with plastic spraying. The anti-corrosion explosion-proof circuit breaker is made of engineering plastic injection molding, with an internal explosion-proof circuit breaker.
2. The explosion-proof circuit breaker is equipped with a high-breaking miniature circuit breaker or a low-voltage molded case circuit breaker.
3. The explosion-proof circuit breaker has overload and short-circuit protection functions, and can also be equipped with additional features as required.
4. The explosion-proof circuit breaker includes protection devices such as leakage and shunt release.
5. The explosion-proof circuit breaker can be wired with steel pipes or cables.
6. Indicator lights and buttons can be added as required.
Scope of Application Groups
1.1 Classification of hazardous areas with explosive gas atmospheres
Different countries and regions classify explosive hazardous areas according to their own standards. China divides explosive gas atmospheres into Zone 0, Zone 1, and Zone 2 based on the frequency and duration of the presence of explosive gas mixtures (consistent with IEC).
Zone 0: An environment where explosive gas mixtures are present continuously or for long periods.
Zone 1: An environment where explosive gas mixtures are likely to occur during normal operation.
Zone 2: An environment where explosive gas mixtures are unlikely to occur during normal operation, or if they do, they exist only for a short time.
Zone 0 generally exists only in sealed containers, storage tanks, and other internal gas spaces. In actual design, Zone 1 is also rare, and most cases fall under Zone 2.
1.2 Explosion-proof electrical equipment is divided into two categories:
Class I: Electrical equipment for use in coal mines
Class II: Electrical equipment for use in places other than mines
1.3 Class II electrical equipment is divided into IIA, IIB, and IIC based on the maximum experimental safe gap or minimum igniting current ratio for explosive gas mixtures, and into six groups T1-T6 based on the maximum surface temperature.
1.4 Explosive gas mixtures are grouped by ignition temperature.
1.5 Explosive gas mixtures are classified by their maximum experimental safe gap (MESG) or minimum igniting current ratio (MICR).
