Hitachi Energy Ltd

Abb Power Grids Switzerland Ag

Hitachi Energy Switzerland Ag

Thomas E Hoburn

Carl Kurinko

Sushil A Shinde

Matthew D Cuppett

Christian Daehler

Paul Jason Vladuchick

Ektor Sotiropoulos

Gary Hammack

Peter Dubach

Arnold P Vitols

Arnols P Vitols

A circuit breaker having at least one capacitor assembly connected in parallel across a contact of the circuit breaker. The capacitor assembly can be housed with the contact within a sealed enclosure of the circuit breaker. The enclosure can be configured to house an insulating medium that is configured to reduce or quench an arc(s) that may form at least when the contact of the circuit breaker is displaced from a closed position to an open position. The capacitor assembly, which includes a transient recovery voltage (TRV) capacitor, can be configured to delay terminal fault and short line fault TRV and the rate of rise of the initial TRV (ITRV) that can appear across the open contact of the circuit breaker.

Circuit breaker having internal transient recovery voltage capacitor assembly

A circuit breaker system is disclosed in the present application. The circuit breaker system includes a housing to hold an electrical interrupter within an internal region separated from an external ambient region. The electrical interrupter includes at least a first pair of electrical contact elements that are movable between open and closed positions. A voltage limiter, such as a metal oxide varistor (MOV), is connected across the pair of electrical contact elements to receive and dissipate a transient voltage when the first pair of electrical contacts is moved from a closed position to an open position, thereby reducing undesired arcing and premature wear or erosion of certain electrical components.

Circuit breaker system with an internal voltage limiter

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Mount Pleasant, PA, United States of America

Thomas E Hoburn