Fuses And Circuit Breakers - Danfoss VLT HVAC Basic Drive FC 101 Design Manual

How to Install
91
92
93
L1 L2
L3
95
Figure 5.19 I7, I8 Frame
IP54 380–480 V 60–75 hp [45–55 kW]
IP54 380–480 V 100–125 hp [75–90 kW]

5.2.3 Fuses and Circuit Breakers

Branch circuit protection
To protect the installation against electrical and fire hazard, all branch circuits in an installation, switch gear, machines, etc.,
must be short-circuit and overcurrent protected according to national and local regulations.
Short circuit protection
Danfoss
Overcurrent protection
Provide overload protection to avoid overheating of the cables in the installation. Overcurrent protection must always be
carried out according to local and national regulations. Circuit breakers and fuses must be designed for protection in a
circuit capable of supplying a maximum of 100,000 A
UL/Non-UL compliance
Use the circuit breakers or fuses listed in Table 5.14 to ensure compliance with UL or IEC 61800-5-1.
Circuit breakers must be designed for protection in a circuit capable of supplying a maximum of 10,000 Arms (symmetrical),
480 V maximum.
NOTICE!
In the event of malfunction, failure to follow the protection recommendation may result in damage to the adjustable
frequency drive.
MG18C522
Design Guide
88
89
81 8
DC-
DC+ R-
R+
96
97
98
U
V
W
99
(symmetrical), 480 V maximum.
rms
Danfoss A/S © Rev. 2014-01-14 All rights reserved.
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