Sankosha Corporation

Kouji Idota

Shin Nakayama

A surge protective device (SPD) includes a jack and a plug detachably attached by insertion to the jack. Inside the plug, a protection circuit which protects equipment to be protected against intruding lightning surge, a degradation detecting unit which detects a degradation state of the protection circuit, a display unit which displays the detection result, or the like, are provided. When a plurality of SPDs are installed together, a juncture plug which detachably connects between juncture terminals within the adjacent SPDs is provided. The detection result of the degradation detecting unit within the plug is output to an outside through a third connection terminal within the plug, a first connection terminal and the juncture terminal within the jack and the juncture plug.

Growing community of inventors

Tokyo, Japan

Kouji Idota