PQube User Manual 2.1
Page 17 of 113
Include overcurrent protection and a disconnecting device
An external overcurrent protection device, such as a fuse or a circuit breaker, must be installed on
each mains connection. The device shall meet the relevant requirements of IEC 60947-1 and IEC
60947-3, and be suitable for the application.
The overcurrent protection device must be rated between 1 amp (minimum) and 20 amps
(maximum).
Your PQube can share the overcurrent protection device with other loads.
An operator-activated disconnecting device, such as a switch or a circuit breaker, must be installed
on the mains connections. This device must be clearly marked as the disconnecting device for your
PQube, and must be marked to indicate the disconnection function. Do not install your PQube in
such a way that it becomes difficult to operate this disconnecting device. The disconnecting device
must not disconnect the earth connection. The disconnecting device should be installed near your
PQube, within easy reach of the operator.
Protect the operator from the hazardous terminals
IMPORTANT: All high voltage parts must be covered, including the AC power to your PQube.
Install your PQube so that all of the screw terminals are not ACCESSIBLE
to the operator. Your PQube
can also be installed without a cover if installed in a lockable IUL 508 control panel.
The operator must be protected from the hazardous screw terminals by a barrier. The screw terminals must be made “not
ACCESSIBLE”, as defined in UL /IEC 61010-1 6.2, using an enclosure or barrier that meets the rigidity requirements of UL /IEC 61010-
1 8.1 and that requires a tool to remove.
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