Danfoss VLT AutomationDrive FC 301 Series Design Manual page 135

Electrical Installation
Figure 9.27 AC Line Input Connection Enclosures C3 (IP20).
U
V W
Figure 9.28 AC Line Input Connection Enclosures C4 (IP20).
MG33BF22
Design Guide
9.3.1 Fuses and Circuit Breakers
9.3.1.1 Fuses
It is recommended to use fuses and/or circuit breakers on
the supply side as protection in case of component break-
down inside the adjustable frequency drive (first fault).
NOTICE!
Using fuses and/or circuit breakers on the supply side is
mandatory to ensure compliance with IEC 60364 for CE
or NEC 2009 for UL.
Branch Circuit Protection
To protect the installation against electrical and fire hazard,
all branch circuits in an installation, switch gear, machines,
etc., must be protected against short-circuit and
overcurrent according to national/international regulations.
NOTICE!
The recommendations given do not cover branch circuit
protection for UL.
Short-circuit protection
Danfoss recommends using the fuses/circuit breakers
mentioned below to protect service personnel and
property in case of component breakdown in the
adjustable frequency drive.
9.3.1.2 Recommendations
The tables in chapter 9.3.1 Fuses and Circuit Breakers list the
recommended rated current. Recommended fuses are of
the type gG for small to medium power sizes. For larger
power sizes, aR fuses are recommended. For circuit
breakers, Moeller types are recommended. Other types of
circuit breakers may be used provided they limit the
energy into the adjustable frequency drive to a level equal
to or lower than the Moeller types.
If fuses/circuit breakers according to recommendations are
selected, possible damage on the adjustable frequency
drive is mainly limited to damages inside the unit.
For further information see Application Note Fuses and
Circuit Breakers, MN90T.
Rev. 2014-04-04 All rights reserved.
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