It is a Masterpact MTZ2 12HA basic switch disconnector, 4 poles, 1250 A, in fixed version. Masterpact MTZ is the last generation of high current air circuit breakers and switch disconnectors up to 6300 A embedding advanced digital technologies. Masterpact MTZ is designed to protect electrical systems from damage caused by overloads, short circuits and equipment ground faults. It is designed for all standard applications. The rated current is 4000 A and the operational voltage is 690 VAC 50/60 Hz. The rated making capacity is 145 kA peak at 690V Ac within AC23A category. Masterpact MTZ front face provides reinforced insulation (Class 2) according to IEC 60664-1 standard. It complies with IEC 60947-3 standard. It is not supplied with power connections. Masterpact MTZ and Micrologic X are part of EcoStruxure architecture system.