Fuses - Danfoss FC 300 Design Manual

FC 300 Design Guide

Fuses

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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:
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 or
other 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. 4-18. Moreover, fuses
or circuit breakers can be used to provide overcurrent protection in the installation. Overcurrent
protection must always be provided according to national regulations.
Fuses must be designed for protection in a circuit capable of supplying a maximum of
100,000 A (symmetrical), 500 V maximum.
rms
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 adjustable frequency drive.
UL Compliance
200-240 V
FC 30X Bussmann
kW Type RK1
2-7.5 KTN-R10
1.1-2.2 KTN-R20
3.0-3.7 KTN-R30
How to Install
Bussmann Bussmann
Type J Type T
JKS-10 JJN-10
JKS-20 JJN-20
JKS-30 JJN-30
MG.33.B6.22 - VLT is a registered Danfoss trademark
FC 30X Max. fuse size
K25-K75 10A
1K1-2K2 20A
3K0-3K7 32A
K37-1K5 10A
2K2-4K0 20A
5K5-7K5 32A
11K 63A
15K 63A
18K 63A
22K 80A
1) Max. fuses - see national/international
regulations for selecting an applicable fuse size.
SIBA Littel fuse
Type RK1 Type RK1
5017906-010 KLN-R10
5017906-020 KLN-R20
5012406-032 KLN-R30
Voltage Type
1) 200-240 V type gG
1) 200-240 V type gG
1) 200-240 V type gG
1) 380-500 V type gG
1) 380-500 V type gG
1) 380-500 V type gG
1)
380-500 V type gG
1)
380-500 V type gG
1) 380-500 V type gG
1) 380-500 V type gG
Ferraz- Ferraz-
Shawmut Shawmut
Type CC Type RK1
ATM-R10 A2K-10R
ATM-R20 A2K-20R
ATM-R30 A2K-30R
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