Circuit interrupter

Details Circuit interrupter Circuit interrupter

1990-12-05

1993-04-06

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 49, H02H 326, H02H 328

Patent

active

052008738

ABSTRACT:
A circuit interrupter is disclosed which provides for tripping of a line lead on occurrence of a loss of neutral or an earth leakage fault without the need for an earth connection. The circuit interrupter includes a circuit breaker which is activated by discharge of a capacitor in a closed loop, the capacitor being connected across the output of a D.C. power supply. A loss of neutral fault is detected as the potential of a neutral lead rises through a pull-up resistor and tripping will occur before the neutral rises to a potential at which the power supply becomes inoperative.

REFERENCES:
patent: 4001648 (1977-01-01), Taketa et al.
patent: 4020394 (1977-04-01), Potash
patent: 4068276 (1978-01-01), Pintell
patent: 4091431 (1978-05-01), Morris
patent: 4578731 (1986-03-01), Andriessen et al.
patent: 4598331 (1986-07-01), Legatti
patent: 4931893 (1990-05-01), Glennon et al.
patent: 4994933 (1991-02-01), Matsuoka

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