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What are the main difference between the AP9550, AP9551, AP9553, AP9554, and the AP9555 Rack Power Distribution Units?

The only differences between the units below are as follows:

Model	Mounting	Input	Output	Voltage Input/Output	Max Amperage Draw
AP9550	Horizontal	L5-20P	5-15R	100v-125v	20A
AP9551	Vertical	L5-20P	5-15R	100v-125v	20A
AP9553	Horizontal	IEC Outlet	IEC Outlets	120v-240v	10A
AP9554	Vertical	IEC Outlet	IEC Outlets	120v-240v	12.8-16A
AP9555	Horizontal	5-20P	5-15R	100v-125v	20A