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:
Feb. 11, 1992
Filed:
Dec. 28, 1989
Guy Laudereau, Arcueil, FR;
Gilles Baurand, Montesson la Borde, FR;
Isabelle Lubin, Rueil Malmaison, FR;
Sylvie Gay, Chatou, FR;
Jacques Berdah, Paris, FR;
Telemecanique, , FR;
Abstract
An electronic thermal relay is disclosed which can be associated with a multiphase electric load for generating a pre-alarm and/or an order for cutting off the power supply to the load in the case of a current overload in at least one phase or an imbalance between phase currents. With each phase is associated a thermal element with a resistive heating element through which the phase current flows, a resistive sensor transmitting to a signal processing circuit a signal representative of the heating and a thermal memory mass. The heating element is thermally coupled to the sensor and to the memory mass by a coupling body whose thermal inertia is less than that of the memory mass.