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Smaller Footprint Higher Voltage Options
– Cartridge Fuse
May 2011
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Agenda
 High Voltage Cartridge Fuse
– Portfolio Overview
– Fuse Selection Guide
– New Product Development Strategy
– Application Guide
 RTMs: 477 series, 505 series, 506 series, 508 series and etc.
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Cartridge Fuse Portfolio Overview
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Fuse Selection Guide
 Selection Factors
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Normal operation current
Application voltage (AC or DC) – Voltage Rating
Maximum available fault current – Interrupting Rating
Overload current and length of time in which the fuse must open
Pulse, Surge Currents, Inrush Currents, Start-up Currents and Circuit
Transients
Ambient temperature
Physical size limitations, e.g. length, diameter, or height
Agency Approvals required, e.g. UL, CSA, VDE, METI and etc
Fuse features (mounting type/form factor, ease of removal, axial leads,
visual indication, etc.)
Fuse-holder features, if applicable and associated rerating (clips, mounting
block, panel mount, PC board mount, etc.)
Application testing and verification prior to production
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Terms
-- Voltage Rating and Interrupting Rating
What will happen if we select a wrong fuse?
250Vac Rated Fuse
Tested at 400Vdc
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Cartridge New Product Strategy
-- Higher energy in a smaller body
Product
Release Date
Valued Proposition
Application
208/209 series
350V-rated 2AG
2008
Alternative to Belfuse.
215 series
High Rating 15A - 20A
2008
1st to market on 20A. Smallest Power Supplies, White
footprint available.
Goods, Telecom
505 series 450V/500Vdc
2009
High BC of 50kA@500Vac and High End UPS, Industrial
20kA@500Vdc.
controls
477 series 600Vac/400Vdc 5x20
2009
Smaller footprint for 400V above 3-phase Power Supplies,
8A
Ballast, Air-conditioner, LCD
977 series
450Vdc LBC 5x20
2010
1st to market for 450Vdc 5x20
506 series
600Vdc HBC 6x32mm (15A - 20A)
2010
Smaller footprint 6x32 vs 10x38 Solar Energy Applications
508 series
1000V HBC 6x32mm (<1A)
2010
Smallest footprint at 6x32 vs
10x38
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Ballast
Network Storage, Servers
Multimeter
Applications for the 477 series
-- 600VAC/400VDC 5x20mm Slo-Blo® Type Fuse
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Application for 477 series
-- Ballast
*477series 600Vac in Ballast Application :
600Vac-rated fuse for Industrial Ballast (for working voltage 480Vac to 600Vac).
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Application for 477 series
-- Air-conditioner
*477series 600Vac in Air-conditioner Application:
600Vac-rated fuse for Air-conditioner(for working voltage less than 500Vac).
04773.15P
0477001P
0477016P,
3PCS each set
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Application for 477 series
-- LCD TV
Market Background
•Higher Voltage Output Combined with the Need for High Efficiency Power Supplies:
Due to the combined demand for higher output voltages and High efficiency Power Factor Correction (PFC)
Switch Mode Power Supplies (SMPS) there is an increasing need for a higher DC voltage rated Fuse. Increase
in demand for high efficiency White Goods, HVAC equipment, ARC Welders and Fluorescent Lighting and many
more High Voltage applications has driven the need for our 477 Series (3AB) Fuse.
•Our insatiable quest for a bigger and better Audio Visual experience.
When a TV panel goes beyond 32 inches, the CCFL (cold cathode fluorescent) backlighting is driven directly from
the 400VDC. Another example of the demand for higher voltages and energy efficiency. The larger the panel the
more voltage required and energy consumed!!!
Socket
Name
Fuse Used
Currently
Market
Driver
Technical Why and Why Not
400VDC
Cartridge and
Radial lead fuse
Ex. 5x20mm
PFC for
higher power
efficiency
PFC output voltage at 380 to 400DC for a
input of 90 to 240 AC. Since the AC
could rated up to 264 V, the voltage rating
of the components on the PFC line are
rated at least 380Vdc or higher.
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Application for 477 series
-- LCD TV (cont)
PWM , Iso
DC / DC
Step Down
220
VAC
24 VDC
CCFL
Inverter
Driver
12VDC
LCD Driver ICs
12 VDC
DC/ DC
CCFL
Timing Circuits
12 VDC
DC/ DC
24VDC
Stand by Circuit
Note: For power saving purpose, there are increasing needs for Standby Circuit protection.
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Application for 477 series
-- LCD TV (cont)
OC Protection of HV DC Bus
Circuits for Larger LCD TV
PFC
400VDC
Fuse
Design Notes:
Protection Application: For the SMPS, after the PFC
circuit, there is a 400VDC bus, due to impedance of the
PFC circuitry, when there is a abnormal condition at the
400VDC bus, there is a threat of thermal event for the
PFC circuit and the DC to DC circuitry.
CCFL
Inverter
Circuits
Solution Description: As shown at the left, a 400V to
450V high breaking capacity DC fuse can be used for
short circuit and overload current conditions. LF provide
477 series for the protection. The 477 comes in a
5x20mm package.
Circuits for Smaller LCD TV
PFC
400V DC
Fuse
12 to 24V DC
Companion Solutions:
N/A
Regulatory Issues: UL Recognized pending.
PWM,
Iso,
Step
Down
Unique Features: Does not apply.
Application Warnings: Caution must be taken for the
breaking capacity of the fuses when apply a 250V AC
fuse at this application.
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Applications for the 505, 506 and 508 series
-- 500V, 600V and 1000V 6x32mm fuse
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Application for 508 series
-- Multi-meter
*508 series 1000Vac/Vdc in Multi-meter Application :
1000Vac/Vdc 315mA and 500mA
10x38 Midget 1000V Fuse
6x32 Ceramic 1000V Fuse
Multi-Meter Category:
Category I: used where current levels are low.
Category II: used on residential branch circuits.
Category III: used on permanently installed loads such as distribution panels,
motors, and appliance outlets.
Category IV: used on locations where current levels are high, such as service
entrances, main panels, and house meters.
- Smaller foot-print (6x32mm) fuse relative to the existing 10x38mm fuse
- Total LF package fuse solution for both 10X38 FLU and 6.3X32 508 series fuse.
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Application for 505 series
*505 series 500Vac and Vdc in Applications of:
• 3 Phase Power Supply
• UPS
• Solar Inverter
Platform: 2.8KW On-Grid Solar Inverter
Application: AC Output Over Current
Protection
Fuse Part number: 0505016.MXP
Fuse Clip Part number: 01020078H
Note: Customer using 0505016 due to
On-Grid power line voltage may go above
264 Volts.
Platform: 2.8KW On-Grid Solar Inverter
Application: DC Input Over Current Protection
Fuse Part number: 0505020.MXP
Fuse Clip Part number: 01020078H
Note: Customer using 0505020 .MXP on the DC
input for 500VDC Input Over Current Protection
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Application for 505 and 506 series
-- Solar Energy Application
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
Combiner Box

Inverter
Application for 505 and 506 series
-- Solar Energy Application
Product
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505 Fuse Series
450VDC/500VDC
10 – 30 amperes
6 X 32 mm
20,000 amperes B/C@450VDC/500VDC
Product
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506 Fuse Series
600VDC
15 – 20 amperes
6 X 32 mm
10,000 amperes B/C@600VDC
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