DW50 air circuit breaker (hereinafter referred as ACB), is suitable for distribution network of AC 50Hz, with rated voltage of 400V/690V, rated current of 200A ~ 1000A. It can be used to distribute electric energy, protect the circuit and power equipment against overload, under-voltage, short-circuit, single-phase earthing, etc. ACB has intelligent protection function, accurate fault diagnosis, good selectivity, high sensitivity, and can improve the reliability and security of power supply. It’s easy to operate. What’s more, the operating mechanism and related accessories produced by our factory is fully adapted to this product.

II. Working Description of the Operating Mechanism:

The product includes operating modes of manual and electric, and adopts closing method of spring energy storage (pre-energy storage). Closing speed has nothing to do with electric and manual operation. The product adopts a cam to compress a set of springs to achieve the purpose of energy storage, and has a trip-free function.

The ACB has three operating positions:

a ) Energy storage: electrically operated or manually operated external force drives the cam to rotate. Energy storage lever is on the cam, the lever compresses the energy storage spring as the cam rotates. When the cam rotates to a certain angle, energy storage ends through a series of drive inside the mechanism.

b) Closing: press the ON button (on the intelligent trip unit or the button supplied by the user to connect the energy - releasing electromagnet), so that the energy - releasing tripping Axle rotates, energy storage lever trips. Under the force of energy storage spring, the spindle rotates driven by a powerful series of transmission, so that the contact is closed.

c) Disconnect: pressing the OFF button or the signal from overcurrent, undervoltage and shunt,and test trip signal on the intelligent trip unit, so breaking trip Axle rotates, and lever trips, linkage mechanism changes, then the ACB is disconnected rapidly under the reaction force of the contact and the reset force of the spring.

* Interlocking mechanism: it’s installed on the right panel of the ACB, stack assemble the ACB with rod connecting interlock, to flat the ACB(fixed or drawout type) and interlock it by steel cable, when one of the ACB is on, another will be off, the interlocking mechanism should be installed by the user.

III. The Operating Performance