H - Electricity – 02 – P
Patent
H - Electricity
02
P
348/1, 318/62
H02P 1/40 (2006.01) H02H 7/22 (2006.01) H02P 1/22 (2006.01) H01H 9/54 (2006.01)
Patent
CA 1086850
POWER CONTACTOR AND CONTROL CIRCUIT Abstract of the Disclosure The power contactor for controlling the applica- tion of power to and the character of the current to a load includes a power relay having contacts connected between a source of power and the load, such as a motor or heater, with each of the contacts being provided with arc suppression means. A steering relay is provided to control the direction of current to a motor and thus its direction of rotation or the voltage applied to a heater. A control circuit insures that the steering relay con- tacts remain either open or closed while power is being applied to the load. The steering relay is provided with bracer bars to prevent short circuiting between relay con- tacts should any welding occur therebetween. The arc suppression means for each of the power relay contacts includes a solid state device, such as a triac, in paral- lel therewith, and auxiliary contacts for controlling the gating current to the triac. The auxiliary contacts close prior to either the opening or closing of the power relay contacts and open just after either the opening and closing of the power relay contacts, and therefore no gating current is applied to the triac while the power relay contacts are closed.
291072
Gowling Lafleur Henderson Llp
Power Management Corporation
LandOfFree
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