Tender For corrigendum : supply of miniature circuit breakers (mcb) for ac operation marked to is/iec 60898 (part 1) (q2) , moulded case circuit breakers (mccb) conforming to is/iec 60947 (part 2) (q3) , residual current operated circuit breakers (rccb) without integral overcurrent protection isi marked to is 12640 (part 1) (q2) , motor protection circuit breaker (mpcb) (q3) , variable voltage variable frequency drive (q3)