♦Construction SAS7 Modular Magnetic Circuit Breaker are of the thermal-magnetic current limitying type , having a compact construction which has been achieved by not only minimising the number of parts but also the number of welded joints and connections.
♦Critical material selection ensures reliability and durability.
♦Typical of this is the choice of silver graphite for the fixed contact. The MCB has an easy to operate handle with a trip-free toggle mechanism-so even when the handle is held in the on position the MCB is ree to trip.
Ambient temperature considerations
SAS7 Modular Magnetic Circuit Breaker are calibrated to meet the requirements of IECBSEN60898.2 VB8035 Ref Calibration Temperature. At other temperatures the following raing factors should be used.
Adjacent thermal-magnetic MCBs should not be continuously loaded at or approaching their nominal rated currents when mounted in enclosures. It is good engineering practice to apply gererous de-rating factors or make provision for adequated free air between devices. In these situations, and in common with other manufacturers, we recommend a 66% diversity factor is applied to the MMCB nominal rated current where it is intended to load the MMCB continuously(in excess of 1 hour).
|Setting temperature of protective characteristics||40|
|Electrical life||Not less than 6000 operations|
|Mechanical life||Not less than 20000 operations|
|No. of pole||1,2,3P|