MCCB is an electrical safety device used to safeguard circuits from excessive overload or short circuits by switching circuits. These devices are used when the current load exceeds the limit of MCBs (Minature Circuit Breaker)
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ABB has bought a newly advanced MCCB (Molded case circuit breaker) for its higher-voltage solar power plants to its Tmax PV range. The breaker is the latest addition to ABB’s complete range of protective solutions for its utility-scale solar plant. It is designed to protect – combiners, switchgear, and inverter up to 1500V DC.
ABB solutions for Starting, switching, and protecting three-phase asynchronous motors are basic operations for their correct use. ABB SACE entails two different type of solutions for this application: –
A traditional system: which foresees a circuit-breaker for protection against short-circuit, a thermal relay for protection against overload and missing or unbalanced phase and a contractor for motor switching;
A system of integrated protection: thanks to the Ekip M-LRIU trip unit, which ensures both protection against short-circuit, and against overload, as well as that against Motor Circuit-breaker with magnetic
A system of integrated protection enables both protection against short-circuit, against overload, and motor circuit-breaker with magnetic only release Thermal relay Contactor PTC PR212/CI Motor Circuit-breaker with electronic release Ekip M-LRIU Contactor Protection against short-circuit Integrated protection missing or unbalanced phase and that against the rotor block.
While selecting these devices, one must take different factors into consideration:
MCCBs are now available with 2 kinds of release – Thermal magnetic and Microprocessor release.
The principle used for Thermal-magnetic is of the bimetal and electromagnetic coil. MCCB tripping can be caused in transient peak as electromagnet is a peak sensing device thus thermal protection is required for O/L and electromagnetic or solenoid for S/C. Thus CB gives the following protection –
The microprocessor is capable of simulating and calculating peak values of the true RMS value of current through the microprocessor. Below protections are offered by microprocessor-based release
• Earth Fault
• Neutral protection
• Instantaneous Over-ride
• Earth Leakage
• Current Unbalance
• Overvoltage
To ensure efficiency in its operation, regular maintenance procedures are to be followed which include visual inspection, lubrication, cleaning, and testing.