Fuses And Circuit Breakers; Fuses; Recommendations; Ce Compliance - Danfoss VLT FC 102 Series Design Manual

Electrical Installation

6.2 Fuses and Circuit Breakers

6.2.1 Fuses

It is recommended to use fuses and/or circuit breakers on
the supply side as protection in case of component
breakdown 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.
WARNING
Protect personnel and property against the consequence
of component breakdown internally in the adjustable
frequency drive.
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.
MG11BC22
Design Guide

6.2.2 Recommendations

WARNING
In case of malfunction, not following the recommen-
dation may result in risk to personnel and damage to
the adjustable frequency drive and other equipment.
The tables in chapter 6.2.4 Fuse Tables list the
recommended rated current. Recommended fuses are of
the type gG for small to medium power sizes. For larger
powers, 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.

6.2.3 CE Compliance

Fuses or circuit breakers are mandatory to comply with IEC
60364. Danfoss recommend using a selection of the
following.
The fuses below are suitable for use on a circuit capable of
delivering 100,000 Arms (symmetrical), 240 V, 480 V, 600 V,
or 690 V depending on the adjustable frequency drive
voltage rating. With the proper fusing the adjustable
frequency drive, short-circuit current rating (SCCR) is
100,000 Arms.
The following UL-listed fuses are suitable:
•
•
•
•
The following max. fuse size and type have been tested:
Danfoss A/S © Rev. 06/2014 All rights reserved.
UL248-4 class CC fuses
UL248-8 class J fuses
UL248-12 class R fuses (RK1)
UL248-15 class T fuses
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