On-vehicle control device

An on-vehicle control device used in an on-vehicle system including a power source unit, a power path to which power based on the power source unit is supplied, a relay provided in the power path, and a block unit provided in the power path, the on-vehicle control device comprising:

• a control unit that switches the block unit to a blocking state on a basis of a first blocking characteristic, wherein
• the relay is turned off on a basis of a second blocking characteristic,
• the first blocking characteristic and the second blocking characteristic are characteristics defining a correspondence relationship between a current value and a time until blocking,
• in the second blocking characteristic, the time decreases with a first degree of decrease as the current value increases,
• in the first blocking characteristic, the time decreases with a second degree of decrease in a first current value range as the current value increases, and the time decreases with a third degree of decrease in a second current value range which is larger than an upper limit value of the first current value range as the current value increases,
• the second degree of decrease and the third degree of decrease are larger than the first degree of decrease, and
• the time is set to be longer in the first blocking characteristic than in the second blocking characteristic for the current value smaller than a threshold set between a lower limit value of the first current value range and an upper limit value of the second current value range, and
• the time is set to be shorter in the first blocking characteristic than in the second blocking characteristic for the current value larger than the threshold.