低压电器外壳防护等级 International Protection
高低压电个人防护 HV AUTH LV Qua
低电压防护 protection against undervoltage
系列三相异步电动机(380 V IP23)是一般用途的低压三相笼型异步电动机，基本防护等级为IP23、绝缘等级为B级。
Y series three phase induction motor (380v IP23) is low voltage motor for normal use. The basic protection class are IP23, insulation class is b.
超大空间、超多防护区应采用低压二氧化碳（CO2）灭火系统。
Ultra-large spaces and multi-protection areas should be protected by low pressure CO2 system.
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