Littelfuse Littlefuse - Protection Unit - 4-20mA - Supply Voltage 65-265 VAC 80-275 VDC - MPU-32-00-00

Features

The MPU-32 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

Applications

This relay is ideal for retrofitting and upgrading obsolete or aging motor protection using existing CTs

Specifications

Input Voltage: 65-265 Vac, 25 VA; 80-275 Vdc, 25 W

Power-Up Time: 800 ms at 120 Vac

Ride-Through Time: 100 ms minimum

24-Vdc Source: 100 mA maximum

AC Measurements: True RMS and DFT, Peak, 16 samples/cycle, and positive and negative sequence of fundamental

Frequency: 50, 60 Hz or ASD

Output Contacts: Three Form C programmables

Communications: TIA-232 (standard); TIA-485, DeviceNet™, Ethernet (optional)

Analog Output: 4-20 mA, programmable

Conformally Coated Standard feature

Approvals: CSA certified, CE (European Union), UL Recognized, C-Tick (Australian)

Overload: 49, 51 Extends motor life and prevents insulation failures and fires

Dynamic thermal model: Provides protection through starting, running, and cooling cycles

Communications: Remotely view measured values and event records, reset trips, and access setpoints

Ground fault: 50G/N, 51G/N Prevents catastrophic failures and fires

Current unbalance/Phase loss/Phase reverse: 46 Prevents overheating due to unbalanced phases

RTD temperature: 38, 49 RTD temperature protection (MPS-RTD module) for high-ambient or loss-of-ventilation protection

Phase loss/Phase reverse (current): 46 Detects unhealthy supply conditions

Overcurrent: 50, 51 Prevents catastrophic failures and fires; extends motor life

Jam: Prevents motor damage by detecting mechanical jams or excessive loading

Undercurrent: 37 Detects low level or no-load conditions

PTC overtemperature: 49 Overtemperature (PTC) protection for high-ambient or loss-of-ventilation detection

Starts per hour: 66 Limits the motor starts per hour to prevent overheating

Differential: 87 Optional MPS-DIF module for sensitive winding-fault protection

Reduced overcurrent mode: Minimizes arc-flash hazards during maintenance

Metering: View measured and calculated parameters with on-board display

MPU-CIM: Separate current input module to reduce risk of open-CT hazard and for convenient installation

Analog output: Provides means for metering selectable parameters

Data logging: On-board 100-event recorder for data logging

Conformal coating: Internal circuits are conformally coated to protect against corrosion and moisture

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Catalogue Page Number: 17-80