Eaton’s Current Monitoring Relays provide protection of mechanical apparatus from jam-up or other overloading conditions that result in measurable increase in motor current. Overcurrent Relays (D65CH) should be used to detect an overcurrent condition, while Undercurrent Monitoring Relays (D65CL) should be used to detect an undercurrent condition. Standard Current Monitoring Relays (D65CE) can be used to detect either an overcurrent or undercurrent condition.