H - Electricity – 01 – H
Patent
H - Electricity
01
H
H01H 71/00 (2006.01) H01H 71/10 (2006.01)
Patent
CA 2158415
At least one inner pole of a multipole circuit breaker is connected in parallel with another pole to reduce the current through the inner pole, and therefore, lower the operating temperature of the circuit breaker. In circuit breakers having electronic trip units, the current transformers providing sensed currents for the poles connected in parallel are connected to the trip unit in parallel. In circuit breakers having thermal-magnetic trip devices, the current/time characteristics of the thermal- magnetic devices associated with the poles connected in parallel are set so that they collectively substantially match the current/time characteristics of the other poles. A four pole breaker can be connected in a three conductor distribution system by connecting the two center poles in parallel to one conductor, and connecting each of the other two poles to a different one of the remaining conductors. One inner pole and the adjacent outer pole can be connected in parallel to one conductor in a two conductor distribution system, with the other inner and outer poles connected in parallel to the other conductor. In the two conductor system, the four pole breaker can be replaced by a three pole breaker having the center pole and one outer pole connected alone in parallel to one conductor and the other outer pole connected to the second conductor.
Bereskin & Parr
Corporation Eaton
LandOfFree
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