Electrical Protection Devices and Functions

This video tutorial explains various circuit protection devices including MCB, MCCB, ELCB, RCCB, RCBO, and MPCB. It covers their full forms, functions, and where to use them. The video highlights the importance of these devices in protecting against overloads, short circuits, and electric shocks. It also discusses the differences between similar devices like RCCB and ELCB, and introduces the concept of combined protection through RCBO. The tutorial concludes with a focus on MPCB for motor protection.

What is the primary function of an isolator in an electrical circuit?

• To switch power on and off

• To detect earth faults

• To prevent short circuits

• To provide overload protection

Which device is used to protect against overload and short circuit in a home?

• Isolator

• MCB

• RCCB

• ELCB

What is the maximum current rating typically available for an MCB?

• 100 Ampere

• 1000 Ampere

• 500 Ampere

• 63 Ampere

How does an MCCB differ from an MCB?

• MCCB is less reliable than MCB

• MCCB is used for switching only

• MCCB provides higher current rating protection

• MCCB does not protect against short circuits

What is the main purpose of an RCCB in a household circuit?

• To switch power on and off

• To prevent overload

• To prevent short circuits

• To prevent electric shocks

What is the key difference between RCCB and ELCB?

• RCCB operates on voltage, ELCB on current

• RCCB requires earthing, ELCB does not

• RCCB operates on current, ELCB on voltage

• RCCB is less sensitive than ELCB

What additional protection does an RCBO provide compared to an RCCB?

• Switching capability

• Phase loss protection

• Voltage regulation

• Overload protection

What is the full form of RCBO?

• Residual Circuit Breaker with Overload

• Residual Current Breaker with Overload

• Residual Current Circuit Breaker with Overload

• Residual Circuit Breaker with Overload Protection

Which device is specifically designed for motor protection?

• MCB

• RCCB

• MCCB

• MPCB

What type of protection does an MPCB provide?

• Overload and short circuit only

• Overload, short circuit, and phase loss

• Phase loss only

• Short circuit and phase loss only