257 / 582
BETA Protecting
SITOR Semiconductor Fuses
SITOR, cylindrical fuse design
4/17
Siemens ET B1 · 10/2008
4
■
Overview
SITOR cylindrical fuses protect power semiconductors against
the effects of short circuits because the super quick disconnect
characteristic is far quicker than that of conventional fuses.
They protect expensive devices and system components such
as semiconductor contactors, electronic relays (solid state),
converters with fuses in the input and in the DC link, UPS systems
and soft starters for motors up to 100 A.
The cylindrical design is approved for industrial applications.
The cylindrical fuse links comply with IEC 60269.
Cylindrical fuse holders also comply with IEC 60269 and
UL 512. The cylindrical fuse holders for 10 x 38 mm and
14
x 51 mm have been tested and approved as fuse switch
disconnectors and the cylindrical fuse holders for 22 x 58 mm as
fuse disconnectors according to the switching device standard
IEC 60947-3. The utilization category and the tested current and
voltage values are specified in the Table "Technical Specifications".
The cylindrical fuse holders have been specially developed for
the application of SITOR fuse links with regard to heat tolerance
and heat dissipation and are therefore not recommended for
standard applications.
Cylindrical fuse bases do not offer the same comprehensive
touch protection as the fuse holders, but have better heat
dissipation. The single-pole cylindrical fuse bases for
14
x 51 mm and 22 x 58 mm allow modular expansion to
multipole bases.
■
Benefits
•
Cylindrical fuses have an extremely compact design and a
correspondingly small footprint.
•
The cylindrical fuses have IEC and UL approval and are
suitable for universal use worldwide.
•
The use of SITOR cylindrical fuses in the cylindrical fuse holders
and bases has been tested with regard to heat dissipation and
maximum current loading. This makes planning and dimensioning
easier and prevents consequential damage.
•
The use of fuse holders as switch disconnectors expands the
area of application of these devices and increases operating
safety.
■
Technical specifications
Sizes
mm × mm
10
× 38
14
× 51
22
× 58
Cylindrical fuse links
3
NC1 0, 3NC1 4, 3NC2 2
Standards
IEC 60269-4; UL 248-13; CSA C22.2 No. 248.13
Approved acc. to
UL 248-13; UL File No. E167357; CSA C22.2 No. 248.13
Fuse holders, fuse bases
3
NC1, 3NC2
Standards
IEC 60269-2; EN 60947-3;UL 512; CSA C22.2 No. 39-M
Approved acc. to
UL 512; UL File No. E220063; CSA C22.2 No. 39-M
Rated voltage
V AC 690
Rated current
I
n
A
32
50
100
Max. power dissipation
of fuse links
(
conductor cross-section used)
W
3 (6
mm
2
)
4.3 (10
mm
2
)
5 (10
mm
2
)
6.5 (25
mm
2
)
9.5 (35
mm
2
)
11 (50
mm
2
)
Feeder terminals
mm
2
1.5 ... 25
1.5 ... 35
4 ... 50
Conductor cross-sections
•
Solid and stranded
mm
2
1.5 ... 25
1.5 ... 35
4 ... 50
•
AWG Conductor cross-section, solid and stranded AWG 18 ... 4
14 ... 2
10 ... 1/0
Utilization category
Acc. to
IEC 60947-3
AC 22B/32 A/400 V
AC 22B/10 A/690 V
AC 22B/50 A/400 V
AC 22B/20 A/690 V
AC 20B/690 V
Rated conditional short-circuit current
•
At 400 V
kA
50 (32
A gG)
100 (50
A gG)
100 (100
A gG)
80 (80
A gG)
© Siemens AG 2008