Enclosure Size; Fuses And Circuit Breakers; Branch Circuit Protection; Short-Circuit Protection - Danfoss VLT HVAC Drive FC 131 Operating Manual

VLT® HVAC Drive FC 131
Operating Guide
3.2.3.8 Enclosure size I7, I8
91
92
93
96
97
L1 L2
L3
U
V
95
99
Illustration 10: Enclosure Sizes I7, I8, IP54, 380–480 V, 45–55 kW (60–70 hp), IP54, 380–480 V, 75–90 kW (100–125 hp)

3.2.4 Fuses and Circuit Breakers

3.2.4.1 Branch Circuit Protection

To prevent fire hazards, protect the branch circuits in an installation - switch gear, machines, and so on - against short circuits and
overcurrent. Follow national and local regulations.

3.2.4.2 Short-circuit Protection

Danfoss recommends using the fuses and circuit breakers listed in this chapter to protect service personnel or other equipment in
case of an internal failure in the unit or a short circuit on the DC link. The drive provides full short-circuit protection in case of a short
circuit on the motor.

3.2.4.3 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. Design circuit breakers and fuses for protection in a circuit capable of supplying a
maximum of 100000 A (symmetrical), 480 V maximum.
rms

3.2.4.4 UL/Non-UL Compliance

To ensure compliance with UL or IEC 61800-5-1, use the circuit breakers or fuses listed in this chapter. Circuit breakers must be
designed for protection in a circuit capable of supplying a maximum of 10000 A

3.2.4.5 Recommendation of Fuses and Circuit Breakers

If a malfunction occurs, failure to follow the protection recommendation may result in damage to the drive.
Table 7: Fuses and Circuit Breakers
Power [kW (hp)]
18 | Danfoss A/S © 2021.06
88
DC-
98
W
N O T I C E
Circuit breaker
UL Non-UL
Bussmann
(symmetrical), 480 V maximum.
rms
UL
Bussmann Bussmann
Type RK5 Type RK1
Fuse
Bussmann Maximum fuse
Type J Type T
AQ367426199594en-000101 / 130R0988
Installation
Non-UL
Type G