Motors.

  

  

  

  

  Disconnects (Stabs) Contact Assembliesarc ChutesOperating MechanisSOCPDSFRAME and Backboard Assemblies

  Figure 1. Air Circuit Breaker Labeled Circuit Diagram

  

  Main disconnects

  Ratings have a double row of primary disconnects raather than round disconnects. See Figure 2.

  Figure 2. Air Circuit Breaker Main Disconnects

  If CurrenT-LIMITING FUSES Are Installed on An ACB, The line-size stabs will sometimes be extended Farther Back from the Circuit Breaker Backboard than the load-size stabs.

  

  Then, then

  Secondary Disconnects

  disconnects as the circuit breaker is racked in and out of its cubicle. See Figure 3.

  Figure 3. Air Circuit Breaker Secondary Disconnects

  Group disconnects

  grouped when there is the position of the frame being Energized.

  Figure 4. Air Circuit Breaker Group Disconnects

  

  Arcing Contacts

  An arcing contact is the contact of a switching device on white an arc is drawn after the main contaect.

  Collect. Cleaning this metal spatter is part of a normal preventive maintenance (PM) propram.

  May be misaligned or worn out. See Figure 5.

  ARCING CONTACTS OFTEN HAVE An ARCING HORN on the Top of the Contact Structure. The Arcing Horn Aids in Transferring they Arc FRCING CONTACT to the Arc Runner in the Arc Chute.

  FIGURE 5. Air Circuit Breaker (ACB) ARCING CONTACTS

  Main contals

  Then, then

  main controls Open, the load is transferred to the intermediation contacts and then to the arcing contacts.

  The Circuit Breaker to Restrike, Which Means It cannot Interrupt the Arc. A RESTRIKE OFTEN Results in the Total Destruction of the Circuit Breaker and Switchgear. See Figure 6.

  Auxiliary Contorys

  Then, then

  Figure 6. Air Circuit Breaker (ACB) RESTRIKES

  Tech FACT

  Are Open, 52A Contacts are open and 52b contacts are closed.

  Air Circuit Breaker (ACB) Auxiliary Contorys

  . SEE FIGURE 7.

  Cleans the contacts.

  When the controls close, the compression of the stationary contination and the contoured suruses a wiping motion aging power party content content content

  FIGURE 7. Air Circuit Breaker (ACB) Contacts Design

  Change the shape of the controls, as this money cause the circuit breaker to malfunction.

  -Voltage Circuit Breakers, Extra Cycles are required to exceeish arcs.

  

  Safety tip

  

  And-Roller CenterLines.

  That they will function properly. See Figure 8.

  Mccb or ICCB Would be.

  FIGURIR CIRCUIT BREAKER (ACB) Working Principle/Operating Mechanism

  May be composed of slate, polycarbonate, or fiberglass. See Figure 9.


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