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POLYFUSEA RESETTABLE FUSE
PRESENTED BY-
KUSHAL AGARWALEN
OVERCURRENT PROBLEMS
Failure Of Electrical Circuit
Equipment Failure
Hazardous For Human Beings
PPTC FUSE
Polymeric Positive Temperature Coefficient Device
Basically a THERMISTORA Series Element In A CircuitSelf Resettable
FUNCTIONS OF PPTC
OVERCURRENT PROTECTION
AUTOMATIC RESTORATION
CONSTRUCTION & OPERATION
OPERATING PARAMETERS
INITIAL RESISTANCE
OPERATING VOLTAGE
HOLDING CURRENT
TRIP CURRENT
TIME TO TRIP
LEAKAGE CURRENT
TRIP CYCLE
TRIP ENDURANCE
THERMAL DURATION
HYSTERESIS
OPERATING CURVES
OPERATING CURVE
OPERATING CHARACTERISTICS
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
APPLICATIONS
BATTERY PROTECTION
I C PROTECTION
PROTECTION OF
ELECTRICAL EQUIPMENTS
PROTECTION DEVICE
INSIDE CONSUMER
ELECTRONICS
PROTECTION OF
COMPUTER PERIPHERALS
POLYFUSE
CONCLUSION
SELF RESETTABLE DEVICE
COMPACT
LOW RESISTANCE
IDEAL FOR LOW VOLTAGE A.C. & D.C.
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
QUERIES???
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