The general of ZAM3 series moulded case circuit breaker
ZAM3 series moulded case circuit breakers(hereafter simply referred to as circuit breakers) are one of the new type breakers which have been developed using international advanced design and manufacturing technology. The rated insulation voltage of the breakers is 800V. In the circuit of AC50Hz, the rated working voltage 690V or bellow(ZAM3-63 400V)and the rated working current up to 800A, the breakers are suitable for infrequent turn-on or turn-off and infrequent motor starting-up. The breakers have overload, short-circuit and under-voltage protection performances so as to protect the circuit and the power equipment from damage.
According to the rated ultimate short-circuit breaking ability(Icu), the breakers are classified into three kinds of types C(basic type),L(standard type),M(second high type).Those breakers have the advantages such as small size, high breaking ability, short arc, anti vibration.
The breakers could be installed vertically (upright) or horizontally (transverse).
The breakers has disconnecting function, its corresponding symbol is shown as “ 
”.
The breakers comply with the demands of the following standards: GB14048.2.
Application conditions for operation and installation
·Ambient temperature :-5℃~+40℃.
·Elevation of installation site:≤2000m.
·Relative humidity: not exceeding 50% at the maximum ambient temperature of +40℃. With the lower temperature, higher humidity would be permitted. E.g. when the relative humidity is 90% at the ambient temperature of 20℃ ，special measures should be taken to solve the dews on the surface, which would appear due to the temperature change.
·Pollution protection: 3 grade.
·Breakers pass the GB/T2423.10 which can tolerate the mechanical vibration(frequency:2Hz~13.2Hz,displacement:±1 and frequency:13.2Hz~125Hz,acceleration：±0.7g).
·Installing categories: III for the main circuits; II for auxiliary circuit and control circuit without connecting with the main circuit.
·Breakers can be used in electromagnetic environment A.
·Humid and tropical type (TH)breakers pass the GB/T2423.4, which can tolerate the Influence of damp air、salt mist、oil mist and mould.
·Breakers should be installed in the place without any explosive medium,conductive dust and can not corrode metal and destroy the insulation.
·The place would not be invade by rain and snow.
·Storage condition: Ambient temperature is -40℃~+70℃.