Recommended Electrical-Backup Protection; Connecting Rack Equipment; Table 2-4: Upstream Circuit Breaker Rating - Emerson Network Power MPH2 User Manual

2.3.6

Recommended Electrical-backup Protection

A field-provided external circuit breaker must be installed upstream of the MPH2 Rack PDU. The circuit
breaker must be sized according to the input rating of the PDU. The circuit breaker rating must meet the
values in Table 2-4.
The external circuit breaker serves as the primary input power disconnect for the MPH2.

2.4 Connecting Rack Equipment

NOTE
Circuit breakers on Emerson's MPH2 Rack PDU are opened at the factory. The open circuit
breakers help protect against high inrush current when input power is first connected.
To mitigate in-rush currents:
• Close the branch circuit breakers after all receptacle loads are connected.
– or –
• For MPH2-C and MPH2-R models, turn the receptacle off before connecting the load.
Once the MPH2 Rack PDU has been installed in the rack, the unit is ready for connection of equipment
that will be powered by the unit or used for monitoring.
Verify that the equipment to be connected meet these requirements:
• Input power requirements of each load do not exceed the MPH2 receptacle ratings.
• Input power cords meet or exceed the rating of the MPH2 receptacles and are fully-engaged.
• Total equipment power consumption will not overload the MPH2 Rack PDU.
To connect devices to an MPH2 Rack PDU:
1. Make sure that input power is installed in accordance with national and local electric codes.
2. Verify that all devices to be connected are shut down and unplugged from input power sources.
3. If the MPH2 Rack PDU will be monitored over a network, connect an Ethernet cable to the LAN port on
the RPC2.
4. Route the devices' power cables to the MPH2 Rack PDU, following proper procedures and good
practices, such as segregating power cables from control cables and keeping cable bends to
recommended angles.
5. Verify that the branch circuit breakers on the MPH2 Rack PDU are open.
Table 2-4 Upstream circuit breaker rating
Maximum Input
Current Per Pole
12 A
16 A
24 A
32 A
40 A
48 A
63 A
20
Rated Current
of Upstream CB
15 A (NA)
20 A (NA)
16 A (EU, WW)
30 A (NA)
32 A (EU, WW)
50 A (NA)
60 A (NA)
63 A (EU, WW)
Installation
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Emerson MPH2 User Manual