26 Rockwell Automation Publication 520-TD002A-EN-E - May 2015
PowerFlex 527 AC Drive Specifications
Fuses and Circuit Breaker Ratings
The PowerFlex 527 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 on pages 27
...30 provide drive ratings and recommended AC line input fuse and circuit breaker information.
Both types of short circuit protection are acceptable 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 27...30. 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.
(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.
Circuit Breakers
The “non-fuse” listings in the tables found on pages 27...30 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.
If the DC Bus terminals or the Dynamic Brake terminals are used, the drive must be installed in an enclosure and fuses must
be used for input protection (for CE applications only). The ventilated enclosure needs to be IP 20 rating or higher and at
least 1.5x size larger than the drive.
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