Fuses - Danfoss VLT HVAC Basic Drive FC 100 Series Design Manual

How to Install
IP20 380-480V 30-45kW
5 5
95
1
1 Line
2 Motor
3 Earth
4 Relays
IP20 380-480V 55-75kW
1
1 Line
2 Relays
3 Earth
4 Motor
50
VLT HVAC Basic Drive Design Guide
99
4
2 3
2
4
3
MG.18.C2.02 - VLT
IP20 380-480V 90kW
1
2
1 Line
2 Relays
3 Earth
4 Motor

5.2.4 Fuses

Branch circuit protection
In order 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/international regulations.
Short circuit protection
Danfoss recommends using the fuses mentioned in the
following tables to protect service personnel or other
equipment in case of an internal failure in the unit or
short-circuit on DC-link. The frequency converter provides
full short circuit protection in case of a short-circuit on the
motor.
Overcurrent protection
Provide overload protection to avoid overheating of the
cables in the installation. Overcurrent protection must
always be carried out according to national regulations.
Fuses must be designed for protection in a circuit capable
of supplying a maximum of 100,000A
480V maximum.
®
is a registered Danfoss trademark
4
3
(symmetrical),
rms