Motor protection switch
US4686599A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 1985 |
| Grant date | Aug 11, 1987 |
| Priority date | — |
| Expiry date | Nov 20, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H11/0006
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The motor protection switch comprises a movable contact piece being manually movable by way of an actuator, which includes actuator buttons. The contact piece can be brought in and out of contact with a resting contact piece. The motor protection switch can also be released by overload current or short circuit current. A retracting or pullback mechanism with two settings settable from outside are provided for the actuator. In the first setting the pullback mechanism will hold the actuator in a trip position between the "on" and the "off" position after overload tripping or short circuit tripping has occurred. In the second setting the pullback mechanism will allow direct movement of the actuator from said "on" position into said "off" position after overload tripping or short circuit tripping has occurred. The simplest embodiment of the pullback mechanism includes a pullback spring acting on a rocking beam mounted between the actuating buttons, the housing side end of which spring is mounted on a slide having two settings. The two settings of the pullback mechanism allow to activate or to deactivate the trip position of the motor protection switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.