Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
The rated current of MCB is
Less than 10 A
Less than 100 A
More than 100 A
More than 200 A
Less than 100 A
A Miniature Circuit Breaker (MCB) is a compact electromagnetic device used for low voltage electrical installations, typically for circuits with current ratings not exceeding 100 A. Beyond this threshold, higher-capacity protective devices like Molded Case Circuit Breakers (MCCBs) are employed due to the higher fault current handling requirements.
A Miniature Circuit Breaker (MCB) is a compact electromagnetic device used for low voltage electrical installations, typically for circuits with current ratings not exceeding 100 A. Beyond this threshold, higher-capacity protective devices like Molded Case Circuit Breakers (MCCBs) are employed due to the higher fault current handling requirements.
IratedтАЛ<100A тАФ standard rating limit for MCB device classification
The MCB operates on two mechanisms: thermal tripping using a bimetallic strip for overload protection, and magnetic tripping using a solenoid for short-circuit protection. Under normal current, the circuit remains closed; if the current exceeds the rated value, the strip bends or the solenoid plunger actuates, triggering the internal contact mechanism to trip the breaker.
MCBs are primarily used for low-voltage residential and commercial wiring protection.
The range of standard MCB ratings is typically from 0.5 A up to 100 A.
Once the current rating exceeds 100 A, the device is usually classified as an MCCB.
Protection is provided against both overload and short-circuit faults.
Easily resettable after a trip condition.
Compact size allows for high-density DIN rail mounting.
Safe handling due to fully insulated enclosure.
Not suitable for high-fault current industrial applications compared to ACB or MCCB.
Limited current-carrying capacity.
Domestic lighting and socket outlets.
Commercial office power distribution.
Small-scale motor protection.
MCBs follow standardized curves (B, C, and D curves) based on their tripping characteristics.
The rating denotes the maximum current the device can carry continuously without tripping under specified ambient conditions.
B is correct тАФ The standard rated current capacity for a Miniature Circuit Breaker (MCB) is generally kept below 100 A for low-voltage distribution systems.
In competitive exams, remember that MCB тЖТ < 100 A, MCCB тЖТ 100 A - 1000 A, and ACB/VCB тЖТ > 1000 A.