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SAS7 Modular Magnetic Circuit Breaker

General 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 free to trip.

Applications
The SAS7 Modular Magnetic Circuit Breaker belong to the advanced level of the nineties in the
world. They have characteristics of small size, high sensitivity, long using life, and strong protective
functions for shortage and overload. The products are the newest generation, and have features
of high protective grade, high breaking capacity, good reliability of sensitive action and convenient
use. It is generally used for illumination and distribution in industry, commerce and buildings.

Specification
Setting temperature of protective characteristics 40
Rated voltage 240/415V
Rated current 1, 3, 5, 10, 15, 20, 25, 32, 40, 50, 60A
Electrical life Not less than 6000 operations
Mechanical life Not less than 20000 operations
Breaking capacity (A) 6000A
No.of pole 1, 2, 3P

Ambient temperature considerations
SAS7 Modular Magnetic Circuit Breaker are calibrated to meet the requirements of IECBSEN
60898.2 VB8035 Ref Calibration Temperature. At other temperatures the following rating 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).

Current limiting effect

Type SA7

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