MPU-32 Series - Motor Protection Unit Series - Littelfuse MPU-32 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 MPU-32 series Motor Protection Unit is used to provide current and temperature-based protection, metering, and data-logging for three-phase, low-voltage, medium-horsepower induction motors. This relay is ideal for retrofitting and upgrading obsolete or aging motor protection using existing CTs. The MPU-32 can be programmed using the front-panel operator interface, the TIA-232 port, or an optional communications network. See the PMA Family of Panel Mount Adapter Kits to replace common obsolete relays.

Motor Protection Unit

  • Three ac-current inputs
  • Earth-leakage-CT input
  • Programmable digital input
  • 24 V dc source for digital input
  • Programmable 4–20-mA analog output
  • Onboard temperature-sensor input
  • 100-Ω-Platinum RTD or PTC
  • Three programmable output relays
  • Local RS-232 communications, optional network communications
  • PC-interface software (SE-Comm-RIS)
  • 4 line x 20 character backlit LCD display
  • Keypad for programming and display selection
  • 4 LEDs; 1 user programmable


  • Current Input Module (MPU-CIM) The MPU-CIM Current Input Module is the interface between the MPU-32 relay and the 5-A-secondary, 1-A-secondary, and sensitive current transformers. The MPU-CIM is ordered separately from the MPU-32 and can be surface- or DIN-rail mounted. Wire-clamping terminals are standard, but the MPUCTI is available for those requiring ring-tongue terminals.

    Features

    • Overload
    • Dynamic thermal model
    • Communications
    • Ground fault
    • Current unbalance/Phase loss/Phase reverse (current)
    • RTD temperature
    • Phase loss/Phase reverser (current)
    • Overcurrent
    • Jam
    • Undercurrent
    • PTC overtemperature
    • Starts per hour
    • Differential

    Access specifications, certifications, check availability and order parts below

    Catalog #Supply
    Voltage
    VAC
    Supply
    Voltage
    VDC
    Relay Contacts ConfigAnalog Output Current mACommunicationsIEEE Device NumbersRelay
    Contact
    Operating
    Weight (lbs/g)Conformally coatedDigital InputsFrequencyGF Trip Level Range pctGF Trip Time sHarmonic FilteringReset TypeSamplesCompare
    MPU-32-SMK0 KgOrder
    MPU-32-00-0065 - 26580 - 2753 Form C (N.O./N.C.)4 - 20RS/TIA-23237 - 38 - 46 - 49 - 50 - 50G - 50N - 51 - 51G - 51N - 66 - 74 - 86 - 87Fail-safe / Non Fail-safe0 KgStandard150; 60; ASD5 - 100% of CT-Primary Rating0.0 - 100.0Standard (DFT)Front-panel switch/Remote N.O. ContactOrder
    MPU-32-00-0165 - 26580 - 2753 Form C (N.O./N.C.)4 - 20RS/TIA-23237 - 38 - 46 - 49 - 50 - 50G - 50N - 51 - 51G - 51N - 66 - 74 - 86 - 87Fail-safe / Non Fail-safe0 KgStandard150; 60; ASD5 - 100% of CT-Primary Rating0.0 - 100.0Standard (DFT)Front-panel switch/Remote N.O. ContactOrder
    MPU-32-01-0065 - 26580 - 2753 Form C (N.O./N.C.)4 - 20RS/TIA-232 - RS/TIA-48537 - 38 - 46 - 49 - 50 - 50G - 50N - 51 - 51G - 51N - 66 - 74 - 86 - 87Fail-safe / Non Fail-safe0 KgStandard150; 60; ASD5 - 100% of CT-Primary Rating0.0 - 100.0Standard (DFT)Front-panel switch/Remote N.O. ContactOrder
    MPU-32-01-0165 - 26580 - 2753 Form C (N.O./N.C.)4 - 20RS/TIA-232 - RS/TIA-48537 - 38 - 46 - 49 - 50 - 50G - 50N - 51 - 51G - 51N - 66 - 74 - 86 - 87Fail-safe / Non Fail-safe0 KgStandard150; 60; ASD5 - 100% of CT-Primary Rating0.0 - 100.0Standard (DFT)Front-panel switch/Remote N.O. ContactOrder
    MPU-32-02-0065 - 26580 - 2753 Form C (N.O./N.C.)4 - 20RS/TIA-232 - DeviceNet37 - 38 - 46 - 49 - 50 - 50G - 50N - 51 - 51G - 51N - 66 - 74 - 86 - 87Fail-safe / Non Fail-safe0 KgStandard150; 60; ASD5 - 100% of CT-Primary Rating0.0 - 100.0Standard (DFT)Front-panel switch/Remote N.O. ContactOrder
    MPU-32-02-0165 - 26580 - 2753 Form C (N.O./N.C.)4 - 20RS/TIA-232 - DeviceNet37 - 38 - 46 - 49 - 50 - 50G - 50N - 51 - 51G - 51N - 66 - 74 - 86 - 87Fail-safe / Non Fail-safe0 KgStandard150; 60; ASD5 - 100% of CT-Primary Rating0.0 - 100.0Standard (DFT)Front-panel switch/Remote N.O. ContactOrder
    MPU-32-04-0065 - 26580 - 2753 Form C (N.O./N.C.)4 - 20RS/TIA-232 - Ethernet37 - 38 - 46 - 49 - 50 - 50G - 50N - 51 - 51G - 51N - 66 - 74 - 86 - 87Fail-safe / Non Fail-safe0 KgStandard150; 60; ASD5 - 100% of CT-Primary Rating0.0 - 100.0Standard (DFT)Front-panel switch/Remote N.O. ContactOrder
    MPU-32-04-0165 - 26580 - 2753 Form C (N.O./N.C.)4 - 20RS/TIA-232 - Ethernet37 - 38 - 46 - 49 - 50 - 50G - 50N - 51 - 51G - 51N - 66 - 74 - 86 - 87Fail-safe / Non Fail-safe0 KgStandard150; 60; ASD5 - 100% of CT-Primary Rating0.0 - 100.0Standard (DFT)Front-panel switch/Remote N.O. ContactOrder
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