Ceramic resistor, production method thereof, neutral grounding resistor and circuit breaker

摘要

A ceramic resistor includes zinc oxide as a main component, and as essential components, aluminum oxide 3.0-40 mol %, magnesium oxide 2.0- 40 mol %, silicon oxide 0.1-10 mol %, and at least one kind of compound 0. 005-0.5 mol %, selected from a group consisting of calcium oxide, strontium oxide and barium oxide, and has a positive temperature coefficient of resistance. A neutral grounding resistor and a gas circuit breaker, each using the above-mentioned ceramic resistors, are disclosed.