Patent ID: 8217740

Claim:
An electromagnetic relay comprising: a coil that generates magnetic force when current is supplied thereto, a contact point part opened and closed by the magnetic force, and a fuse functional part electrically connected in series to the contact point part and formed of a conductor which is disconnected when a predetermined heat quantity is received, wherein: the fuse functional part is arranged at a position that receives arc heat generated in the contact point part when the contact point part is switched from a conduction state to a cut-off state; the electromagnetic relay has a pair of fixed holders that hold a pair of fixed contact points fixed to a main body, and a movable holder that holds a pair of movable contact points in a short-circuited state, the pair of movable contact points being arranged opposed to the pair of fixed contact points, the contact point part is provided by the fixed and movable contact points, and the fuse functional part is at least a part of the movable holder; a length and a cross-sectional area of a first part of the movable holder are set such that current of a first range flowing into the electromagnetic relay disconnects the fuse functional part due to both arc heat and Joule heat of current passing through the fuse functional part, the first part being interposed between a contact point part and the fuse functional part, the first range being smaller than current of a second range which disconnects the fuse functional part due only to Joule heat of current passing through the fuse functional part.