ES449631A3 - Improvements introduced in a control device for the retention coil of a circuit breaker. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Perfections introduced in a control device for the retention coil of a circuit breaker having trip means including a undervoltage release retention coil whose excitation below a predetermined minimum results in a trip operation of said trip means ; whose control device for said coil comprises power supply means for supplying electric current to said retention coil; current control means connected to said retention coil for controlling the passage of current therethrough, said current control means including an input element whose activation establishes a current passage through said retention coil; a strong control voltage; means generating a reference value coupled to said control voltage source to establish an electric reference value; means generating a test value coupled to said control voltage source to establish an electrical test value proportional to the control voltage supplied by the control voltage source; and differential means coupled to said reference value generating means; and test values connected to said input element in such a way as to activate the latter as long as said test value increases above said reference value and deactivates said input element as long as said test value falls below of said reference value, whereby said current control means establish a current passage through said retention coil as long as the control voltage increases above a first predetermined value, and interrupts the passage of current through said retention coil provided that the control voltage falls below a second predetermined value. (Machine-translation by Google Translate, not legally binding)