Thermal relays particularly for starting single-phase asynchronous motors
US4241370A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1978 |
| Grant date | Dec 23, 1980 |
| Priority date | — |
| Expiry date | Nov 14, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C1/014
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor starting relay particularly adapted for use in starting single phase asynchronous motors comprises a resistor element of positive temperature coefficient of resistivity which is compactly arranged within a housing and engaged by electrical contact and terminals means of particular structure and of a material of relatively high thermal resistance in a novel way such that power dissipation or loss by the resistor is reduced to a very low level after it has performed its motor starting function but so that, at the same time, the resistor is adapted to cool more rapidly after interruption of motor operation to permit prompt motor restarting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.