Electromagnetic relay and detection system

An electromagnetic relay comprising:

• a drive coil;
• a movable iron core that is disposed in a coil of the drive coil, the movable iron core moving in a first direction along a coil axis of the drive coil and a second direction opposite to the first direction based on driving of the drive coil;
• a movable contactor that is disposed in the first direction with respect to the movable iron core, the movable contactor being mechanically connected to the movable iron core and moving between a first position and a second position with the movement of the movable iron core;
• a fixed terminal that comes into contact with the movable contactor at the first position and does not come into contact with the movable contactor at the second position;
• a yoke that has a second-direction end surface portion positioned in the second direction with respect to the drive coil;
• and
• a detection coil that detects the movable iron core,
• wherein the detection coil is disposed in the second direction with respect to the second-direction end surface portion of the yoke, and
• the movable iron core moves in a coil of the detection coil with the movement of the movable iron core in the first direction and the second direction.