27178333 polyfuse ppt
TRANSCRIPT
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POLYFUSEA RESETTABLE FUSE
PRESENTED BY-
KUSHAL AGARWALEN
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OVERCURRENT PROBLEMS
Failure Of Electrical Circuit
Equipment Failure
Hazardous For Human Beings
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PPTC FUSE
Polymeric Positive Temperature Coefficient Device
Basically a THERMISTORA Series Element In A CircuitSelf Resettable
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FUNCTIONS OF PPTC
OVERCURRENT PROTECTION
AUTOMATIC RESTORATION
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CONSTRUCTION & OPERATION
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OPERATING PARAMETERS
INITIAL RESISTANCE
OPERATING VOLTAGE
HOLDING CURRENT
TRIP CURRENT
TIME TO TRIP
LEAKAGE CURRENT
TRIP CYCLE
TRIP ENDURANCE
THERMAL DURATION
HYSTERESIS
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OPERATING CURVES
OPERATING CURVE
OPERATING CHARACTERISTICS
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ADVANTAGES OVER OTHER FUSES
PPTC CPTC Bi-metal Conventional
Resettable Yes Yes Yes No
Size Small Medium Large Large
Resistance Low High Low Low
Power loss Low High Low Low
Cost Low Medium High High
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APPLICATIONS
BATTERY PROTECTION
I C PROTECTION
PROTECTION OF
ELECTRICAL EQUIPMENTS
PROTECTION DEVICE
INSIDE CONSUMER
ELECTRONICS
PROTECTION OF
COMPUTER PERIPHERALS
POLYFUSE
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CONCLUSION
SELF RESETTABLE DEVICE
COMPACT
LOW RESISTANCE
IDEAL FOR LOW VOLTAGE A.C. & D.C.
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REFERENCES
• Electronics For You, Edition- September, 2004• Raychem circuit protection products- Tyco
Electronics• http://www.circuitprotection.com • http://www.wikipedia.com• http://www.inter-technical.com
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QUERIES???