MP8000 Series - Littelfuse MP8000 Relays Provide Exceptional Motor Protection

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The MP8000 Series Motor Protection Relay is designed to protect three-phase or single-phase motors with operating voltages of 90-690 V ac (use of external potential transformers can extend upper voltage range above 690 V ac). The MP8000 protects any motor drawing 0.5-1,000 full load amperes (external CTs are required above 100 A). The MP8000 Series provides locked rotor, overload, overtemperature, and unbalance protection. Voltage-based protection elements are standard. These relays include inverse time-over current elements suitable for overload protection, and they also provide monitoring functions. The protection is unsurpassed by combining overload, voltage, phase loss and reversal, voltage and current imbalance, power monitoring, and underload in one package.

The relay operates as a fail-safe device. This means when the voltage is within the programmed limits, the relay will energize—the NO contact will close. When the unit loses power or senses a fault condition, the relay will de-energize and contacts will return to their original state. Once the unit has been installed and programmed, it is ready to operate. Once acceptable voltage is applied and the RD0 timer expires, the relay will energize—the NO contact will close.

Bluetooth/Ethernet Programming
This advanced motor protection electronic overload relay is fully programmable via Bluetooth® using an iPhone or Android smartphone/tablet with the Littelfuse App. The Bluetooth and Ethernet functions are easy to use, and arc-flash safety is increased because the app allows settings to be modified and real-time operational information viewed. The user is not required to open the control panel for viewing operational information and faults on the app. These relays also feature an Ethernet communications port that can be used to form an Ethernet Modbus TCP/IP or Ethernet/IP network. They can be remotely monitored and controlled from a PC, or SCADA system, and data logging through a PC with the optional MP8000 software or other software program using the MP8000 memory map. This capability allows for a simple cost-effective way to further enhance arc-flash safety.


  • Bluetooth capability
  • Ethernet communications port

Access specifications, certifications, check availability and order parts below

Catalog #Supply
Voltage (V)
Termination TypeMounting MethodFull Load Amp Range (A)DimensionsWeight (lbs/g)Overcurrent Trip ClassCommunications InterfaceCommunications ProtocolCommunications RangeConformally coatedCurrent Accuracy (%)FrequencyStockSamples
MP800085 - 26490 - 690 Vac (use of external PTs can extend the upper range above 690 Vac)Control relay: SPST - Form A; Auxilliary relay: SPDT - Form CTorque: Depluggable terminal blocks: 7 in-lbs; Earth ground: 7.9 in-lbsSurface mount (4 - #8 screws) or DIN rail mount0.5 - 10 direct; 100+ (external CTs required)2.91 H x 4.08 W x 4.79 D in. (73.9 x 103.6 x 121.7 mm)0 Kg02 - 60 or linearBluetooth; Ethernet Modbus TCP/IP or Ethernet/IPEthernet Modbus TCP/IP or Ethernet/IPBluetooth range is up to 30 ft (range may be reduced depending on the smartphone/tablet used; enclosure type; or environmental factors)Yes±2% (2 to 100 A direct)50/60 HzCheckOrder
Catalog # Certificates
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