MPCB ( Motor Protection Circuit Breaker ), Current rating: 3- 4A, Thermal release range: 2. 5- 4 A, Class: 10, Breaking Capacity: 50kA, Pole: 3P, Voltage: 415V AC, 1NO + 1NC auxiliary contact block. As per Sr no. 74 of Bill of Material ( BOM ) of RDSO Specification no. RDSO/ PE/ SPEC/ AC/ 0184- 2015 ( Rev. 0 ) & Conforming to RDSO spec no RDSO/ PE/ SPEC/ AC/ 0184- 2015 ( Rev. 0 ) suitable for use in ventilation fan unit. RDSO Approved make only