MINIATURE CIRCUIT BREAKERS Sample Clauses
MINIATURE CIRCUIT BREAKERS. The Miniature Circuit Breakers (MCBs) shall be heat resistant, moulded type, designed, manufactured and tested as per IS 8828 . The MCBs shall have inverse-time tripping characteristic against over loads and instantaneous trip against short circuits. The MCBs shall be of fault current limiting type also. The MCBs shall be slip on type to the Bus-bar. The ON and OFF machines of the switch handle shall be clearly marked.The incoming and outgoing of the MCBs shall be accessible only after opening the front door of the DB. The MCBs shall be suitable for 415V, 3 phases, 4 wires, 50 Hz system with the fault level of 10 KA RMS symmetrical. The terminals of MCBs shall be suitable for use with eye lugs. The 4 pole, 3 pole and 2 pole MCB knobs shall be trunked with adequate strength tandem pin. The MCB value of the instantaneous tripping current, they are categorized into 3 types, namely, B,C and D. Type B is for resi stive or slightly inductive loads such as heating and lighting, Type C for Inductive loads such as motors or transformers and Type D for loads such as UPS, VFDs and high discharge illumination.
MINIATURE CIRCUIT BREAKERS. Facilities shall be provided for protection and isolation of circuits associated with protection, control and instrumentation systems. Miniature Circuit Breakers (MCB's) complying with IEC 60947 are preferred to fuses.