防爆安全型是在正常工作状态下不产生火花、电弧和危险温度的电气设备上采取适当的措施,以提高安全程度的一种防爆类型。从防爆的效果来看,它与隔爆型比较,使用在爆炸性气体环境的安全性能要低一些。因此,安全型电气设备的使用场所受到一定的限制。但安全型的结构由于本身的特点在制造、使用、维修等方面较隔爆型有许多优点,有一些国家比较注意应用和发展这种防爆类型。西德试验较早,把隔爆型电气设 Explosion-proof safety type is a kind of explosion-proof type which takes proper measures on the electrical equipment which does not produce sparks, arcs and dangerous temperature under normal working condition, in order to improve the safety. From the effect of explosion-proof point of view, it is compared with the explosion-proof, the use of the safety performance in the explosive gas environment to be lower. Therefore, the safe use of electrical equipment places subject to certain restrictions. However, the safety-type structure has many advantages over the explosion-proof type in terms of manufacture, use and maintenance because of its own characteristics. Some countries pay more attention to the application and development of such explosion-proof type. West Germany experiment earlier, the flameproof electrical design