Rockwell Automation Publication 520-UM001I-EN-E - July 2016 23
Installation/Wiring Chapter 1
Fuses and Circuit Breakers
The PowerFlex 520-series 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.
The tables found on pages 24
...27 provide recommended AC line input fuse and
circuit breaker information. See Fusing and Circuit Breakers below for UL and
IEC requirements. Sizes listed are the recommended sizes based on 40 °C
(104 °F) and the U.S. N.E.C. Other country, state or local codes may require
different ratings.
Fusing
The recommended fuse types are listed in the tables found on pages 24...27. If
available current ratings do not match those listed in the tables provided, choose
the next higher fuse rating.
• IEC – BS88 (British Standard) Parts 1 & 2
(1)
, EN60269-1, Parts 1 & 2,
type GG or equivalent should be used.
• UL – UL Class CC, T, RK1, or J should be used.
Circuit Breakers
The “non-fuse” listings in the tables found on pages 24...27 include inverse time
circuit breakers, instantaneous trip circuit breakers (motor circuit protectors)
and 140M self-protected combination motor controllers. If one of these is chosen
as the desired protection method, the following requirements apply:
• IEC – Both types of circuit breakers and 140M self-protected
combination motor controllers are acceptable for IEC installations.
• UL – Only inverse time circuit breakers and the specified 140M self-
protected combination motor controllers are acceptable for UL
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 motor applications.
• Bulletin 140M can be used up stream from the drive without the need for
fuses.
(1) Typical designations include, but may not be limited to the following;
Parts 1 & 2: AC, AD, BC, BD, CD, DD, ED, EFS, EF, FF, FG, GF, GG, GH.
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