Hirschmann RS20 series User Manual page 8

Supply voltage for PoE power supply units (optional)

 Connect the protective conductor with the ground screw before you set
up the other connections. When removing the cables, remove the
protective conductor last.
 Make sure that the cross-section of the protective conductor cable is
the same size as or bigger than the cross-section of the voltage supply
cables.
 Only use connection cables that are permitted for the specified
temperature range.
 Connect only a supply voltage that corresponds to the type plate of
your device.
 PoE power supply unit RPS90/48V LV:18 V DC to 60 V DC
 PoE power supply unit RPS90/48V HV:48 V DC to 320 V DC or 90
V AC to 265 V AC
 Install a suitable input fuse in the following cases:

The neutral conductor or the negative terminal of the supply voltage
is ungrounded.

For the supply voltage, you provide a DC voltage greater than
125 V DC.
See "General technical data" on page 64.
 With AC power supply, use a cable cross-section of at least 0.75 mm²
(for North America AWG 18) for the current conductor at the voltage
input.
 With DC power supply, use a cable cross-section of at least 1.0 mm²
(for North America AWG 16) for the current conductor at the voltage
input.
8
Installation RS20/22/30/32/40
Release 05 12/2015