Resistor device

A resistor device comprising:

• a resistor body having at least first, second and third ends with a first resistance value provided between the first and second ends and with a second resistance value different from the first resistance value provided between the first and third ends,
• a base of insulation material,
• a conductor member having a base half portion embedded in the base and a tip half portion exposed from the base and connected to the first end,
• a first terminal having a central portion embedded in the base and an inner end portion connected to the second end,
• a second terminal having a central portion embedded in the base and an inner end portion connected to the third end,
• a third terminal provided adjacent and away from the conductor member and having an central portion embedded in the base,
• a fuse provided between the third terminal and the conductor member,
• a pair of insulation sheets for holding the fuse, the resistor body, the inner end portions of the first to third terminals and the tip half portion of the conductor member therebetween, and
• a pair of cover plates made of a metal with a good thermal conductivity to hold the insulation sheets therebetween, such that air flows outside the cover plates and that one of the cover plates has an inlet opening formed at a portion corresponding to the fuse to introduce part of the air to inside the cover plates.