Mitsubishi Denki Kabushiki Kaisha

Toshin Denki Kabushiki Kaisha

Takashi Anamura

Hiroyuki Akita

Yuji Nakahara

Nobuaki Miyake

Ken-Ichi Azuma

Setsuo Hosogai

Kunihiko Takahata

Malfunction of an earth leakage breaker due to a lightning surge is prevented, and when a lightning arrester is short-circuited and damaged by a high-level lightning surge, a power supply short circuit is prevented. A contactan overcurrent detector sectionand a zero phase current transformerare disposed in order from a power supply side to a load side, and a lightning arresteris connected between the overcurrent detector sectionand the zero phase current transformer

Earth Leakage Breaker

The magnetic performance, rigidity and mechanical precision of an iron core assembly can be improved. A plurality of plate-shaped core segments are disposed in succession to form a plurality of first and second core members respectively. Edge portions of adjacent core segments of the first and second core members are coupled with each other. The first and second core members are alternately laminated one over another in such a manner that first inter-segment positions each defined between adjacent two first core segments of the first core member are offset from second inter-segment positions each defined between adjacent two second core segments of the second core member in a longitudinal direction of the first and second core members, with those edge portions of the respective first and second core segments which adjoin each other in a laminating direction in which the first and second core members are laminated being overlapped each other. The core segments of the first and second core members are rotated relative to each other through the coupling means so as to form an enclosed or ring-like configuration.

Method for producing an iron core assembly

Iron core assembly and method for producing the same

Growing community of inventors

Tokyo, Japan

Takashi Anamura