The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 23, 1999
Filed:
Aug. 25, 1997
William Weizhong Chen, Cedar Rapids, IA (US);
Colin Cornhill, Cedar Rapids, IA (US);
Andy Haun, Cedar Rapids, IA (US);
Gary Scott, Mt. Vernon, IA (US);
Manzoor Ali, Cedar Rapids, IA (US);
William Rezac, Cedar Rapids, IA (US);
Kevin James Green, Cedar Rapids, IA (US);
Square D Company, Palatine, IL (US);
Abstract
A Positive Temperature Coefficient Resistivity (PTC) element has a resistivity that increases as the temperature increases. Circuit breakers having PTC elements can achieve better overload and short circuit protection than existing products. Breakers with PTC elements can also be combined with ground fault detection circuits to activate the circuit breaker under ground fault conditions that are less severe than the overcurrent conditions that would normally activate the circuit breaker. A shunt trip assembly incorporating a PTC resistor reduces the required power rating of the clearing switch.