531X152IOCAKG1 | General Electric OVERCURRENT IOC CARD

The MDP is a digital non-directional overcurrent relay that protects against three phase and ground faults. Time overcurrent relays are used for the protection of feeders, transmission lines, alternating current machines, and for many other applications where accurate measurement of current and timing are necessary. The MDP relays have control inputs and outputs that can be used for a zone interlocking scheme. Remote control and monitoring of the breaker enables control room breaker operation. The MDP includes four measuring units, one for each of the three phase currents and one for ground or residual current. The phase and ground units contain settings for time overcurrent (TOC) and instantaneous overcurrent (IOC). The instantaneous unit can be disabled or blocked.The MDP has four output relay contacts, including two which can be configured to distinguish between phase and ground or between time and instantaneous trips. Three external inputs are provided to block tripping by the ground unit, block tripping by the instantaneous functions, and indicate the breaker status.