MCCB Quiz

Which item in below is not a part of MCCB ?

• Operating Mechanism

• Contacts

• Vacuum Extinguisher

• Trip Unit

To provide an insulated housing to mount all of the circuit breaker components called ?

• MCCB Fire damper.

• MCCB Molded case.

• MCCB Trip unit

• MCCB Contacts

The MCCB handle position indicates the ....?

• Fire Extinguisher position.

• Status of the contacts

• Status of frame

• Location of MCCB

How many position is there for MCCB handle?

• Three

• One

• Two

• No positions

To indicate the faulted circuit you must check ?

• MCCB internal parts

• MCCB handle position

• MCCB location

• MCCB terminals.

Which parts in below is the brain of MCCB?

• The Arc Extinguisher unit.

• The Molded case unit.

• The MCCB terminals.

• The MCCB trip unit.

Thermal magnetic unit working in principles of ……….?

• Current and heat

• Voltage and heat.

• Voltage and frequency.

• Voltage drop.

Breakers using the combination of magnetic elements and thermal elements are often called……………..?

• Thermal magnetic breakers

• Electronic breakers

• Magnetic breakers.

• Thermal breakers.

At ambient temperatures below 40°C, the breaker may carries …………than its continuous current rating.

• Less current.

• Same current.

• More current

• More voltage

choose how to restore the MCCB handle after tripping in case of short circuit occurred?

• Repairing the fault area only.

• Push the handle up to ON position.

• Push the handlr to OFF then Push it up to ON position.

• Change the MCCB with new unit