18 Rockwell Automation Publication 520-UM001A-EN-E - February 2013
Chapter 1 Installation/Wiring
Fuses and Circuit Breakers
The PowerFlex 525 drive does not provide branch short circuit protection. This
product should be installed with either input fuses or an input circuit breaker.
National and local industrial safety regulations and/or electrical codes may
determine additional requirements for these installations.
Bulletin 140M (Self-Protected Combination Controller)/UL489 Circuit
Breakers
When using Bulletin 140M or UL489 rated circuit breakers, the guidelines listed
below must be followed in order to meet the NEC requirements for branch
circuit protection.
• Bulletin 140M can be used in single and group motor applications.
• Bulletin 140M can be used up stream from the drive without the need for
fuses.
Fusing
The ratings in the tables that follow are the recommended values for use with
each drive rating. The devices listed in this table are provided to serve as a guide.
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