Mitsubishi Materials Corporation

Koichi Kurasawa

Yoshiyuki Tanaka

Takaaki Itoh

Takaaki Ito

Keisuke Kumano

Mikio Harada

A surge absorber composed of a surge absorbing element comprising a silicon two-terminal thyristor element having a PNPNP or NPNPN junction structure and a bulk resistance element 12 comprising a material having a resistivity within a range of from 10.sup.-4 .OMEGA..multidot.cm to 10.sup.3 .OMEGA..multidot.cm and having a resistance value within a range of from 5.OMEGA. to 50.OMEGA., these elements being connected in series to form an integral body is disclosed. The inventive surge absorber requires reduced manhours for its production and is of a small size, but yet provides a large surge capacity.

Surge absorber

A surge detecting element which is connected to surge invading lines and is composed of a gap type discharge tube and a nonlinear resistor both connected in series with each other and one or more of surge absorbing elements each having an impulse discharge starting voltage higher than an impulse discharge starting voltage of the surge detecting element. A light receiving element is provided for the gap type discharge tube in light receiving relationship therewith for detecting a discharge light thereof, a counter circuit for counting a detected signal from the light receiving element is also provided.

Surge counter

A junction box for the protection of electronic devices and communication lines from lightning surges, overcurrent and overvoltage. The box includes sockets for connection to the devices and liens along with a plurality of combinations of surge absorbing elements and low melting point metal wires for the protection feature.

Growing community of inventors

Saitama-ken, Japan

Koichi Kurasawa