supply and retrofitting of air circuit breaker, numerical protection and accessories to replace existing lt power contractor module of rating more than 90kw for 2x600 mw, chp ph-i, sstpp, mppgcl, dongalia supply and retrofitting of air circuit breaker, numerical protection and accessories to replace existing lt power contractor module of rating more than 90kw for 2x600 mw, chp ph-i, sstpp, mppgcl, dongalia , acb ( 800, tp ) , electrically operated d / o type, within built ( motor ) release, breaking capacity 50ka , , icu=ics=icw 50ka for 1sec, high mechanical & electrical life, including accessories position indication switch , key lock, ready to close contact, panel door lock, spring charge indication. acb release shall have following protection: the protection release offer short circuit with time delay, instantaneous short circuit, current unbalance, earth fault, under voltage trip ( time delayed ) ) , over load protection. protection release and timers shall be self powered type and shall be capable of satisfactory continuous operation between 80-120% of the rated voltage. the thresholds, trip curves, delays, fault history should be retained even when no power is supplied. the protection release should have self-diagnosis feature. in case of any abnormality, should be able to signal / display the warning. the protection release should facilitate “test” function through front push button. the protection releases have the provision to extend signal to remote. the protection release has the sufficient no. of leds for indicating the protection operated. protection release shall have necessary arrangement to allow setting without dismantling the breaker. high resolution backlit lcd display password protected setting and command. last five trip & event recording with date and time. provision for self diagnostic test. auto doubling features for nuisance tripping confirming to emi / emc standard. following metering be available: current, voltage, power, energy, power factor etc. the release shall be capable of measuring and storing values of a wide range of quantities, all events, faults and disturbance recordings with a time stamping using the internal real time clock. , retrofitting kit ( bus bar - cu bus bar link, control fuse, indicating lamp- on / off / trip / spring charging, ctd, ammeter, wire, 400 / 1a, 5p10, 10va protection ct, s, heater etc. ) , retrofitting charges