Fuse Tables; Protection; Fuse Selection - Danfoss VLT FC 103 Instruction Manual

Specifications

10.3 Fuse Tables

10.3.1 Protection

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-circuited and
overcurrent protected according to national/international
regulations.
Short-circuit Protection
The adjustable frequency drive must be protected against
short-circuit to avoid electrical or fire hazard. Danfoss
recommends using the fuses mentioned below to protect
service personnel and equipment in case of an internal
failure in the adjustable frequency drive. The adjustable
frequency drive provides full short-circuit protection in
case of a short-circuit on the motor output.
Overcurrent Protection:
Provide overload protection to avoid fire hazard due to
overheating of the cables in the installation. The adjustable
frequency drive is equipped with internal overcurrent
protection that can be used for upstream overload
Power
Size
Bussman Littelfuse PN
PN
N110 170M2619 LA50QS300-4 L50S-300
N132 170M2620 LA50QS350-4 L50S-350
N160 170M2621 LA50QS400-4 L50S-400
N200 170M4015 LA50QS500-4 L50S-500
N250 170M4016 LA50QS600-4 L50S-600
N315 170M4017 LA50QS800-4 L50S-800
Table 10.6 Fuse Options for 380–480 V Adjustable Frequency Drives
®
VLT Refrigeration Drive Instruction Manual
Fuse options
Littelfuse Bussmann Siba PN
PN PN
FWH-300A 20 610
31.315
FWH-350A 20 610
31.350
FWH-400A 20 610
31.400
FWH-500A 20 610
31.550
FWH-600A 20 610
31.630
FWH-800A 20 610
31.800
®
MG16J122 - VLT is a registered Danfoss trademark
protection (UL applications excluded). See 4-18 Current
Limit. Moreover, fuses or circuit breakers can be used to
provide the overcurrent protection in the installation.
Overcurrent protection must always be carried out
according to national regulations.

10.3.2 Fuse Selection

Danfoss recommends using the following fuses which will
ensure compliance with EN50178. In case of malfunction,
not following the recommendation may result in
unnecessary damage to the adjustable frequency drive.
The fuses below are suitable for use on a circuit capable of
delivering 100,000 Arms (symmetrical).
N110-N315 380–480 V
N75K–N400 525–690 V
Table 10.5
Ferraz-Shawmut Ferraz-Shawmut PN
PN (Europe)
A50QS300-4 6,9URD31D08A0315
A50QS350-4 6,9URD31D08A0350
A50QS400-4 6,9URD31D08A0400
A50QS500-4 6,9URD31D08A0550
A50QS600-4 6,9URD31D08A0630
A50QS800-4 6,9URD32D08A0800
type aR
type aR
Ferraz-Shawmut PN
(North America)
10
A070URD31KI0315
A070URD31KI0350
A070URD31KI0400
A070URD31KI0550
A070URD31KI0630
A070URD31KI0800
10-9
10