1 / 23

Understanding Circuit Protection: Fuses, Breakers, and Testing Techniques

This comprehensive guide covers circuit protection components, including various types of fuses, their installation and testing methods. Learn about auto-fuses, mini and maxi fuses, as well as fusible links and circuit breakers. Understand the importance of correct fuse sizing using Watt's law to ensure optimal protection. Discover testing techniques for electronic devices, including relays and solenoids, and how to diagnose circuit defects. This essential information is crucial for both DIY enthusiasts and professionals in electrical work.

hilel-mccarty
Télécharger la présentation

Understanding Circuit Protection: Fuses, Breakers, and Testing Techniques

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ELECTRICAL COMPONENTS

  2. Circuit Protection

  3. Circuit Protection • Types of Fused Protection How to pull them

  4. Fuses • Auto-fuse (blade type and Color coded) • Mini-fuse • Maxi-fuse A. TEST HOLES B. REMOVAL

  5. Maxi-fuses • Combination blade / cartridge • Protects main circuits • Safer than fusible link • Cover fewer circuits than a fusible link • Often in Power Distribution box

  6. Ceramic and Glass • Rated by current failure level • Three letter code for type and size • Glass style replaces ceramic • Caution in pulling

  7. Two reasons for blowing Where do they blow? Why?

  8. New Circuits ? • What size of fuse should I install? • Use Watts law. Watts divided by volts

  9. FUSIBLE LINKS • Lighter gauge wire than main conductor • Covered with special insulation • Protect Main circuits • Usually under hood

  10. Fusible Links Repair • Location • Circuits protected • Insulation • Visual checks • Installing a new link • 4 wire sizes smaller (4 numbers larger) • Soldering

  11. Fuses Male Pal fuses Female Pal fuses Bolt on Pal Fuses

  12. Circuit Breaker • Why circuit breakers • Styles • Deterioration

  13. TESTING CIRCUIT PROTECTION DEVICES • Must inspect closely • Type of failure determines cause • Best to use DVOM • Do not overload circuit by installing to large of fuse or tin foil • Connections must be tight • Do not use un-fused jumper wire

  14. Electrical Components

  15. Switches • Controls electrical current (N.O. or N.C.) • Single-pole, single throw (SPST) • Momentary Switch • Single-pole, double throw switch (SPDT) • Ganged Switch

  16. Relays • Electromagnetic Switches (Relays) • Two Circuits • Control Circuit • Load Circuit • Magnetic field operates contacts • Late model relays are universal

  17. TESTING RELAYS • Can use several methods to test • Must Check both circuits • Be careful using test light if relay is operated by computer • Can bench test if needed • Some relays have schematic on them • Must be correct resistance

  18. SOLENOIDS • Electromagnetic device with a iron core • Does mechanical work • Core is moveable and does work • Can test with DVOM

  19. STEPPED RESISTORS • Usually used to control fan motor speeds • Resistance is changed by control of switch • Controls current to change speeds • Thermal fuse

  20. Variable Resisters • Rheostats • Two terminals • Higher current • Potentiometer • Three terminals • Lower current • Many uses for variable types

  21. The three types of circuit defects are: • Shorts • Grounds • Opens • poor connections

  22. TESTING FOR CIRCUIT DEFECTS • DVOM IS BEST TO USE! • Must know circuit operation before can diagnose problem • Must know how to use equipment and which equipment to use.

  23. Now, did he say, “Amps, Volts or Ohms”?

More Related