Tender For corrigendum : supply of mcb - miniature circuit - breakers for a.c. operation as per is / iec 60898 (part 1) (q2) , molded case circuit breakers (mccb) as per is / iec 60947 (q3) , mccb with thermal magnetic / microprocessor based trip unit (q3) , rccb - residual current operated circuit - breakers as per is 12640 (q3) , motor protection circuit breaker (mpcb) (q3) , variablevoltagevariablefrequencydrive (q3)