基 本 原 理 | 基 本 原 理 | 显 示 图 |
隔爆型“d”
Flame-proof
“d”
IEC 60 079-1
EN 50 018 | 将设备在正常运行时，能产生火花电弧的部件置于隔爆外壳体，隔爆外壳能承受内部的爆炸压力而不致损失，并能防止传播到外壳外。
Parts which can ignite an explosive atmosphere are placed in anenclosure which, if there is an ignition of an explosive mixtureinternally, will withstand the pressure and prevent the explosionbeing transmitted to the atmosphere around the enclosure. | 
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增安型“e”
Increased safety
“e”
IEC 60 079-7
EN 50 019 | 在正常运行时不会产生电弧、火花和危险高温，在结构上再进一步采取保护措施，提高设备的**性Additional measures are taken to achieve a higher level of safetyand avoid the risk of impermissibly high temperatures and theoccurrence of sparks and arcs internally or on external parts ofelectrical equipment, which in normal use produce neither sparks,arcs nor dangerous temperatures. | 
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正压型“P”
Pressurised apparatus
“P”
IEC 60 079-3
EN 50 016 | 保持内部保护气体的压力高于周围，以免爆炸性混合物进入外壳,或使足量的保护气体通过外壳，使内部的爆炸性混合物的浓度降至爆炸下限以下。保持内部保护气体的压力高于周围，以免爆炸性混合物进入外壳，或使足量的保护气体通过外壳，使内部的爆炸性混合物的浓度降至爆炸下限以下。
The formation of an explosive atmosphere inside an enclosure isprevented by using a protective gas to maintain an internal overpressure relative to the surrounding atmosphere, and if necessary,the interior of the enclosure is permanently supplied withprotective gas so that there is dilution of flammable mixtures. | 
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本质**型“i”Intrinsic safety“i”
IEC 60 079-11 EN 50 020。 | 设备内部的电路在规定的条件下，正常工作或规定的故障状态下产生的电火花和热效应均不能点燃爆炸性混合物。
The equipment placed in the hazardous area contains onlyintrinsically safe circuits.A circuit is intrinsically safe if nosparks of thermal effects occur under establishedtest conditions (including the normal operating and certain fault conditions ),which could lead to the ignition of a given explosive atmosphere. | 
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充油型“O”
Oil immersion“O”
IEC 60 079-6
EN 50 015 | 将电气设备的部件整个浸在保护液中，使设备不能够点燃液面上或外壳外面的爆炸性气体。
Electrical equipment or parts of electrical equipment are immersedin a protective liquid in such a way that an explosive atmosphereabove the surface of outside the enclosure cannot be? ignited. | 
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充砂型“q”
Powder filling“q”
IEC 60 079-5
EN 50 017 | 电气设备的一种防爆型式，将能点燃爆炸性气体的被固定导电部件完全埋入填充材料中，以防止点燃外部爆炸性气体环境。
Type of protection by which the equipment parts that could becomean ignition source are fixed in position and completely surroundedby finely ground solids, so
as to prevent ignition of an external explosive atmosphere. | 
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浇封型“m”
Moulding
“m” IEC 60 079-18EN 50 028 | 将可能点燃爆炸性混合物的部分浇封在复合物中，使它不能点燃周围的爆炸性气体。
Parts which can ignite an explosive atmosphere are embedded incasting compound so that the explosive atmosphere cannot beignited. | 
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无火花型“n”
Protection method“n”
IEC60 079-15
EN 50 021 | 电器设备不能点燃周围的爆炸性气体（在正常的工作条件下和在确定的非正常工作条件下）。
Electrical equipment is not capable of igniting a surroundingexplosive atmosphere( in normal operation and under definedabnormal operating conditions ). | 2区
n型的几种保护方法Zone 2 Several protection methods of type n aresubsumed
under the protection type. |