MCCB (FDMA1)

ApplicationIt is applied in the circuit of AC50Hz or 60Hz, rated current from 16A to 630A, insulation voltage 750V, rated operating voltage 690V or below, and it's mainly Used for LV distribution network to distribute the electric energy and protect the circuit and power device from overload, short-circuit, under-voltage, grounding fault And so on. By special release, it can be used as starting protection circuit breaker of the motor. It accords with IEC 60947-2 standard.The magnetic only releaser which equips the SACES1, S2 and S3 circuit-breakers have a Fixed trip threshold as indicated in the table. For S1, the magnetic only capacity N=25kA; For S2, breaking capacities N=36kA and S=50kA are available. The latter version is only Available in the 10 x l th version.The thermo magnetic releases which equip the SACE S2 and S3 circuit-breakers have the Thermal element with threshold adjustable from 0.7÷ 1× Ln. The regulated current value Which is obtained by using the appropriate selector must be intended as the rated value At 40C. The magnetic element has fixed trip threshold, with trip values which vary according to the phase setting. The S2 circuit breaker with breaking capacity S=50kA is only Available in the 10× Lth version.The thermo magnetic releases which equip SACE S5 and S6 circuit-breakers have the thermal Element with threshold adjustable from 0.7÷ 1× Ln. The regulated current value which is Obtained by using the appropriate selector must be intended as the rated value at 40C. The Magnetic element can be adjusted from 5÷ 10× Ln. The table gives the maximum magnetic Trip values (10× Ln) for protection of the phases (L1-L2-L3) and of the neutral.The trip thresholds of the magnetic protection are a function of the setting used both For protection of the phases(L1-L2-L3) and of the neutral. The releases denominated 10× Lth are indicated for all distribution applications, whereas the releases denominated 5× Lth and 3× Lth are used where a low magnetic trip threshold is required. with regard To this, the 3× Lth are particularly suitable for protection of generators.Protection characteristicBreaking Capacity: X: 100kA; G: 85kA; H: 65kA; S: 50kA; N: 35kA; B: 20kA