Circuit breaker

Circuit interruption is executed in the event of faulty connection of a distribution line, thereby improving safety. Contacts 3, which are opened and closed by drive mechanism 4, are inserted in a main current path between power-supply-side terminal area 1 and load-side terminal area 2. Neutral-line...

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Bibliographic Details
Main Authors TAKASHI KITAMURA, HIROFUMI KONISHI, YOICHI KUNIMOTO, TOMOYUKI SAWADA, YOICHI YOKOYAMA
Format Patent
LanguageEnglish
Published 03.02.1999
Edition6
Subjects
BASIC ELECTRIC ELEMENTS
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
EMERGENCY PROTECTIVE DEVICES
GENERATION
RELAYS
SELECTORS
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Summary:Circuit interruption is executed in the event of faulty connection of a distribution line, thereby improving safety. Contacts 3, which are opened and closed by drive mechanism 4, are inserted in a main current path between power-supply-side terminal area 1 and load-side terminal area 2. Neutral-line potential response means 10 between legs of the main current path are equipped with a series circuit containing energizing coil 12 and thyristor SCR1, while resistor R2, capacitor C1, and diode D2 are connected in parallel across the gate and cathode of thyristor SCR1. Furthermore, resistor R2 is connected through Zener diode ZD to main-current-path neutral-line-side lead N. In the event of reversal of live and neutral connections, or an open neutral, a potential difference is generated between neutral-line-side lead N and ground connection area 7. As a result, Zener diode ZD passes current, turning ON thyristor SCR1 and opening contacts 3. The circuit also responds to excessive current, and may include an earth leakage detection transformer.
Bibliography:Application Number: GB19950009342