4.6.14 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-
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 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 protection (UL applications excluded). See par. F-43
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.
Non-UL compliance
If UL/cUL is not to be complied with, we recommend using the following fuses, which will ensure compliance with EN50178:
P160 - P250 380–480 V type gG
P315 - P450 380–480 V type gR
UL Compliance
380–480 V, frame sizes D, E and F
The fuses below are suitable for use on a circuit capable of delivering 100,000 Arms (symmetrical), 240 V, or 480 V, or 500 V, or 600 V depending on
the drive voltage rating. With the proper fusing, the drive Short Circuit Current Rating (SCCR) is 100,000 Arms.
Size/
Type
Bussmann
E1958
JFHR2**
Bussmann
E4273
T/JDDZ**
SIBA
E180276
JFHR2
LittelFuse
E71611
JFHR2**
Ferraz-
Shawmut
E60314
JFHR2**
Bussmann
E4274
H/JDDZ**
Bussmann
E125085
JFHR2*
Internal
Option
Bussmann
P160 FWH-
400
JJS-
400
2061032.40 L50S-400 A50-P400 NOS-
400
170M4012 170M4016
P200 FWH-
500
JJS-
500
2061032.50 L50S-500 A50-P500 NOS-
500
170M4014 170M4016
P250 FWH-
600
JJS-
600
2062032.63 L50S-600 A50-P600 NOS-
600
170M4016 170M4016
Table 4.3: Frame size D, Line fuses, 380–480 V
Size/Type Bussmann PN* Rating Ferraz Siba
P315 170M4017 700 A, 700 V 6.9URD31D08A0700 20 610 32.700
P355 170M6013 900 A, 700 V 6.9URD33D08A0900 20 630 32.900
P400 170M6013 900 A, 700 V 6.9URD33D08A0900 20 630 32.900
P450 170M6013 900 A, 700 V 6.9URD33D08A0900 20 630 32.900
Table 4.4: Frame size E, Line fuses, 380–480 V
Size/Type Bussmann PN* Rating Siba Internal Bussmann Option
P500 170M7081 1600 A, 700 V 20 695 32.1600 170M7082
P560 170M7081 1600 A, 700 V 20 695 32.1600 170M7082
P630 170M7082 2000 A, 700 V 20 695 32.2000 170M7082
P710 170M7082 2000 A, 700 V 20 695 32.2000 170M7082
Table 4.5: Frame size F, Line fuses, 380–480 V
VLT AQUA Low Harmonic Drive Instruction
Manual
4 How to Install
MG.20.T1.22 - VLT
®
is a registered Danfoss trademark
4-49
4
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