3.6.14 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 over-current protected according to national/international regulations.
Short-circuit protection:
The frequency converter 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 frequency converter provides full short-circuit protection in case
of a short-circuit on the motor output.
Over-current protection
Provide overload protection to avoid fire hazard due to overheating of the cables in the installation. The frequency converter is equipped with an internal
over-current protection that can be used for upstream overload protection (UL-applications excluded). See par. 4-18
Current Limit
. Moreover, fuses or
circuit breakers can be used to provide the over-current protection in the installation. Over-current 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:
In case of malfunction, not following the recommendation may result in unnecessary damage to the frequency converter.
P110 - P250
380 - 480 V
type gG
P315 - P450
380 - 480 V
type gR
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), 240V, or 480V, or 500V, or 600V 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
RKI/JDDZ
LittelFuse
E71611
JFHR2**
Ferraz-
Shawmut
E60314
JFHR2**
Bussmann
E4274
H/JDDZ**
Bussmann
E125085
JFHR2*
Internal
Option
Bussmann
P110
FWH-
300
JJS-
300
2028220-
315
L50S-300
A50-P300
NOS-
300
170M3017
170M3018
P132
FWH-
350
JJS-
350
2028220-
315
L50S-350
A50-P350
NOS-
350
170M3018
170M3018
P160
FWH-
400
JJS-
400
206xx32-
400
L50S-400
A50-P400
NOS-
400
170M4012
170M4016
P200
FWH-
500
JJS-
500
206xx32-
500
L50S-500
A50-P500
NOS-
500
170M4014
170M4016
P250
FWH-
600
JJS-
600
206xx32-
600
L50S-600
A50-P600
NOS-
600
170M4016
170M4016
Table 3.4: 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 3.5: 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
P800
170M7083
2500 A, 700 V
20 695 32.2500
170M7083
P1M0
170M7083
2500 A, 700 V
20 695 32.2500
170M7083
Table 3.6: Frame size F, Line fuses, 380-480 V
VLT AQUA High Power Operation Instructions
3 How to Install
MG.20.P3.02 - VLT
®
is a registered Danfoss trademark
65
3
