Application
DW45 series intelligent universal circuit breakers could be used fir cntrolling The low voltage distribution net and keeping it safety . Installing in the low voltage Distribution panels, it works as master switch to play general safety role. Its technical nature has reached the international advanced standard of that kind of products in 1990s, It suits the circuit of AC 50Hz, rated voltage is 660V(690V) or below, rated current 400A-6300A.
 Varied intelligent controller offers various function, The breaker has disconnecting function, its corresponding symbols is shown as
 The breakers comply with the demands of the following standards, IEC 60947-2,GB14048.2-2001
Classification
According to the mounting: fixed and draw-out
According to the poles: three poles, four poles
According to the operation ways: motor and manual(maintenance and repair)
According to the release: intelligent over current controller,under-voltage instantaneous(or delay) release, and shunt release
The capability of the intelligent over-current controller:
classification: H type(normal), M type (normal intelligent), L type (economic)
has the function of overload long delay reverse time limit protection
single phase earthed protective function
indication function: setting current indication, action current indication, each wire voltage indication(should mention as you order)
Alarm function
Self-diagnostics function
Test function
Environment condition for operation and installation
Ambient temperature: -5‚ÑÉ--+10‚ÑÉ,and average temperature in 24 hours below +35‚ÑÉ(except for special orders).
Elevation of installation site:≤2000m
Relative humodity: Not exceeding 50% at the maximum ambient temperature of +40‚ÑÉ. With lower temperature, higher humidity would be permitted, but the lowest average temperature in month not exceeding +25‚ÑÉ during the most moist month, and the maximum monthly average relative humidity not exceeding 90% in that month, and giving consideration to the dews on the goods surface, which would appear due to temperature change. Pollution protection: 3 degree
Installing categories: IV for breaker's main circuit, coils of under voltage release and primary circuit of transformers;III for other auxiliary circuits and control circuit.
The breaker used on ships and in humid tropical area can work normally without influence of humid air, salt fog and mildew.
The breakers used in ships can operate reliably under normal vibration.
the breaker should be installed according to stipulations in operation manual. For breakers in common use, the vertical gradient is not more than 5o, for that used on ships, the vertical gradient is not more than 55.5o.
The breaker should be put in the place where is not any explosive medium and conductive dust and no gas,which would corrode metal or destroy the insulation.
The breaker should be installed in compartment of switchboard and doorframe should be fixed additionally, protection grade is up to IP40.