| 摘要 |
PURPOSE: A surge protection device is provided to supply a stable power by using a protective ground and a communication ground as a common ground. CONSTITUTION: A first ground and a second ground are normally used independently. The first ground and the second ground are used as a common ground in case of lightening. The first ground is normally used as a protective ground. The second ground is normally used as a communication ground. A surge protection unit (100) discharges surge voltage to outside. [Reference numerals] (200) Earth leakage breaker unit; (300) Load unit
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