Siemens Aktiengesellschaft

Gerald Plank

Anand Venkatramani

Richard Lang

A circuit breaker for interrupting an electrical circuit when current limit values and/or current/time period limit values are exceeded has an energy transducer, the primary side of which is connected to the electrical circuit and the secondary side of which provides a power supply for at least one control unit of the circuit breaker. A first rectifier circuit and a second rectifier circuit are connected to the secondary-side output of the energy transducer. The first rectifier circuit is connected to the secondary-side output of the energy transducer via a capacitor.

Circuit breaker

An injection unit has an injector arrangement connected to a pressure reservoir by a pressure line arrangement The injector arrangement has at least one servo injection valve and a control valve for the release of fuel from a control chamber into a fuel return line leading to the fuel tank The Valve may be operated by a piezoelectric actuator to cause a displacement of a nozzle body in the direction of an injection passage opening for initiating an injection process by pressure reduction in the control chamber. The fuel return line has a controllable valve, which restricts the fuel flow in the fuel return line in the actuated state. It is, thus, possible to reduce the effects of a change of length of the piezoelectric actuator, which exceeds the so-called tolerance gap in the servo injection valve, which are detrimental to the operation of the injection unit.

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Fensterbach, Germany

Gerald Plank