240 volt GFCI for a heat pump, why?

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mlnk

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Installation instructions call for a 240 volt GFCI circuit breaker on the feeder wires going to the fused disconnect box. Does anyone know why the manufacturer would want this?
 
Installation instructions call for a 240 volt GFCI circuit breaker on the feeder wires going to the fused disconnect box. Does anyone know why the manufacturer would want this?
Perhaps it is a heat pump for a swimming pool or spa?
 
I found out the answer. The GFCI is required for install in Japan. In USA a standard breaker is OK. Apparently they do not usually have grounding in Japan. !
 
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