27178333 Polyfuse Ppt

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???