Spotlight on Circuit Protection - Power Electronics

comes with a 100-A, 200-A or 300-A
copper main bus. The panels accommodate
12 to 42 circuits.
Ferraz Shawmut
Newburyport, Mass.
http://us.ferrazshawmut.com
Inrush Current Limiter
With a high-temperature construction
that allows safe operation at high
continuous currents, Ametherm’s
MegaSurge Series inrush current limiter
withstands up to 50 A of continuous current
and 960 J of input energy. The device
is offered in sizes ranging from 12 mm
to 35 mm with resistance values from
1 Ω to 220 Ω. Steady-state current values
are available from 2 A to 50 A. Target
applications include ac motors and
motor drives, X-ray equipment, power
supplies, universal power supplies and
welding equipment.
Ametherm
Carson City, Nev.
www.ametherm.com
Surge-Suppressor Guide
Circuit Components has developed a
surge-suppressor selection guide to help
customers narrow their search of surge
suppressors for their application needs.
The guide is a graphics page depicting
the category and the location within the
electrical network of the equipment to be
protected. Clicking on the user’s specific
equipment location and category will display
a list of available surge-suppressor
solutions. It serves as a general guide,
and final selection depends on specific
requirements.
Circuit Components
Tempe, Ariz.
www.surgecontrol.com
Radial Leaded Fuses
The RoHS-compliant Cooper
Bussmann SR-5, SS-5 and new SR-5H
Series of radial leaded fuses provides
cost-effective primary circuit protection
without sacrificing performance
in space-constrained power-supply
applications. The IEC designs have approvals
through 6.3 A, and UL designs
through 10 A. For applications requiring
fuse replacement, a radial fuse holder is
available.
The SR-5H Series and more SR-5
low-amp ratings (now 40 mA to 6.3 A)
expand an already diverse offering of
<strong>Spotlight</strong> on Circuit Protection
radial fuses that include fast-acting and
time-delay versions. The SR-5H Series
also provides protection up to 300 Vac
with an interrupting rating of 100 A. The
round SR-5 radial fuses offer equivalent
product performance to typical 5-mm
glass fuses with a 60% footprint reduction.
The rectangular SS-5 fuses offer an
additional 33% reduction to the SR-5
footprint.
Cooper Bussmann
Ellisville, Mo.
www.cooperbussmann.com
Tantalum Capacitors
AVX’s TAW Series of fused tantalum
capacitors features an internal fuse to
protect against short circuits and damaging
high dc leakage currents. Each
tantalum capacitor in this series will
remove itself from the circuit and into
fail-safe mode when the internal fuse
exceeds the current limit.
The lead-free, RoHS-compliant TAW
tantalum capacitor series provides capacitance
values up to 10 MΩ and low
ESR for high-reliability applications.
Manufactured using thin-film technology,
the TAW Series is priced starting at
$0.65 each in quantities of 10,000.
AVX
Myrtle Beach, S.C.
www.avx.com
PPTC Thermistors
From Littelfuse, the 0603L series
Polyfuse PPTC (polymer positive temperature
coefficient thermistor) is a
micro form-factor resettable overcurrent
protection device. The 0603L PPTC
series is available in four hold current/
maximum voltage ranges: 0.10 A/15
Vdc, 0.20 A/9 Vdc, 0.25 A/9 Vdc and
0.35 A/6 Vdc. The 0603-sized device has
a maximum fault current rating of 40 A
and is certified by both TUV and UL.
Littelfuse
Des Plaines, Ill.
www.littelfuse.com PETech
www.powerelectronics.com 43
Power Electronics Technology August 2008