当装置冷却到安全工作温度时，触点自动闭合，恢复正常工作状态。
When installed cooling to a safe temperature, contact automatic closure and a return to normal working condition.
安全性能好：由于LED灯工作温度低，灯具结构合理，隔爆、抗冲击、密封性能高故井下使用安全性能好。
Good security: as the Operation temperature of LED lights is low, lamps 'structure is reasonable, explosion, impact resistance, and high sealing performance, it is safe to use in the underground.
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