Low voltage circuit breaker with multiple contacts for high currents

A multipole low voltage circuit breaker for high currents, said circuit breaker being housed in an insulating case, each pole comprising:

• a plurality of movable contact fingers, each of said contact fingers having the same length, said contact fingers extending parallel to and spaced apart from each other, each of said contact fingers comprising a movable main contact and a front extension extending from said movable main contact, at least one of said contact fingers comprising a movable arcing contact disposed along said front extension;
• a stationary main contact electrically connected to a first connection pad, said stationary main contact positioned to be electrically connected with said movable main contact of each of said contact fingers;
• an arcing extinguishing chamber comprising a plurality of stacked metal plates for deionizing an arc, said stacked metal plates being disposed between upper and lower stationary horns, said upper and lower stationary horns being made of a conducting material, said lower stationary horn being electrically connected to said stationary main contact;
• a stationary arcing contact fixed between said lower stationary arcing horn and said stationary main contact, said stationary arcing contact being electrically connected to said lower stationary horn and said first connection pad, wherein said stationary arcing contact is fixed in position with respect to said movable contact fingers;
• urging means to drive said contact fingers between open and closed positions, wherein said movable and stationary main contacts are electrically connected while said movable and stationary arcing contacts are spaced apart from each other in said closed position, and wherein said movable main contacts and said movable arcing contact are spaced apart from said stationary main contact and said stationary arcing contact, respectively, in said open position;
• wherein said lower stationary horn comprises a protrusion which extends past said stationary arcing contact in a direction of movement of said contact fingers towards said open position;
• and
• wherein said movable and stationary arcing contacts are electrically connected with each other at an intermediate position between said open and closed positions.