Siemens Aktiengesellschaft

Georg Weidner

Gerd Kummerow

Gerhard Schroether

Friedrich Hufnagel

Lothar Zentgraf

Kurt Krause

Rolf Voigt

Rudolf Doerfler

Rudolf Schnabel

Boudewijn Moerman

A manually operable circuit breaker having coupling terminals and a visible isolating gap which can be established only when the protective circuit breaker is open. The isolating gap is provided by an isolating module which is mountable on coupling terminals of the circuit breaker. The isolating module contains a removable isolating unit. The isolating unit can be removed only when the protective circuit breaker is open. In this way, the circuit breaker is provided with a visible isolating gap only when required.

Manually operable circuit breaker

The invention concerns a system for monitoring the operating condition of a switch by utilizing one or more integrating stages to determine the switching capacity and prevent overstresses. One or more monitoring devices for current, switch action rate, arc quench chamber insulation, contact condition, mechanical condition, operating temperature, or contact voltage are provided, which report the equipment condition, particularly the switching capacity. The sensors are functionally connected with the switchgear drive via a processing stage. The current sensors, together with a counting device, can report the .intg. i.n.dt, i.e. a measure of the stressing of the switch, and in doing so can disable the drive of the equipment. The invention serves the early detection of switchgear which is no longer fully operational, so that these can be replaced before an overstress occurs.

System for monitoring the operating condition of a switch to prevent

An improved locking member for the housing of an electric switching apparatus including a contact plate having a threaded aperture, and a screw-type electrical contact disposed in the aperture. The housing has an elongated slit disposed therein transverse to the direction of insertion of the contact plate into the housing which opens into the interior thereof adjacent the plate and the contact. The locking member is inserted through the slit into the housing for securing the contact plate therein. The improvement of the invention comprises the locking member comprising a planar sheet member having a recess disposed therein and a projection member integrally formed with the sheet member extending into the recess in the plane of the sheet member from one side thereof. The projection member is supported in the housing below the aperture in the contact plate so that it is engaged by the screw contact during insertion thereof into the contact plate and is bent downwardly from the plane of the sheet member below the housing slit. Withdrawal of the sheet member from the slit and the housing is thereby prevented.

Locking member for securing a contact plate in the housing of an

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Amberg, Germany

Georg Weidner