高/低压力开关，排气过热保护，热熔结温控器，压缩机热保护器。
High/low voltage switch, Exhausting overheat protect, anti-freezing temperature controller.
在工作中，如果控制激光器温度的温控器失效，恒流源自身的过热保护功能可切断驱动电流，强迫激光器停止工作，确保了激光器的安全使用。
During the work, if the temperature controller is invalid, the excessive heat protect circuit can cut the driving current, and force the laser to stop work to insure the safety of lasers.
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