| 摘要 |
An electronic tripping device of a circuit breaker is provided to reduce a sliding frication resistance between a plunger and a cylinder by setting the gap between a lower portion of a U-shaped groove and an oil dash port wider than the gap between a side portion of the U-shaped groove and the oil dash port. Main circuit current flows on an electronic coil(10), and an oil dash port(11) is arranged in a bobbin(9) of the electronic coil. A cylinder includes a plunger, an armature and a plunger-returning spring. A magnetic yoke(12) has an L-shaped including an armature, and a U-shaped groove is formed through the notch at the sectional unit of each piece in the magnetic yoke. The oil dash port is installed at the magnetic yoke, and the gap wider than the gap between the main surface of the oil dash port and the side portion of the U-shaped groove is formed between the main surface the oil dash port and the lower surface of the U-shaped groove in the state of the formation of the U-shaped groove.
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