The GE Multilin MM300 is a sophisticated digital motor protection and management relay designed for low-voltage (LV) motors. As a part of the Multilin family, it provides comprehensive protection, control, and monitoring in a modular, compact package. The “W/O Accessories” designation typically refers to the base chassis unit without optional add-ons like external digital I/O modules, specialized communication cards, or remote display panels, allowing for a cost-effective solution tailored to specific motor control center (MCC) requirements.
Product Specifications
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Model: MM300 (Motor Manager)
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Motor Types: Three-phase low-voltage AC motors
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Protection Functions: 49 (Thermal Overload), 50P/51P (Phase Overcurrent), 50G/51G (Ground Overcurrent), 46 (Current Unbalance), 37 (Undercurrent/Underload), 66 (Start Inhibit/Starts per Hour).
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Control Functions: Integrated Starter Logic (Full Voltage Non-Reversing, Reversing, Two-Speed, Star-Delta).
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Monitoring: Real-time metering of Phase Currents, Ground Current, Motor Load, and Thermal Capacity.
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Communication: Standard RS485 Modbus RTU; supports optional Ethernet (Modbus TCP/IP, EtherNet/IP, Profinet).
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Power Supply: Available in 24 VDC or 120/240 VAC versions (model dependent).
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Dimensions: 133 mm x 95 mm x 125 mm.
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Mounting: Standard 35mm DIN rail.
Application Fields
The MM300 is an industry staple for Motor Control Centers (MCC) across diverse sectors, including Oil & Gas, Mining, Water Treatment, and Automotive Manufacturing. It is specifically designed to manage high-cycle motor applications such as conveyor belts, industrial pumps, fans, and compressors. Its ability to integrate protection and starter logic into a single device reduces wiring complexity and saves significant space within electrical cabinets.
Product Instructions
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Installation: Mount the MM300 on a 35mm DIN rail inside a ventilated enclosure. Ensure the unit is grounded using the designated terminal to prevent electrical noise interference.
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CT Connection: Connect the motor’s phase conductors through the integrated or external Current Transformers (CTs). Ensure the orientation matches the direction of current flow to maintain accurate metering.
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Basic Configuration: Initial setup is typically performed via the EnerVista MM300 Setup software or an optional front-panel display. You must input the motor’s Full Load Amps (FLA), Service Factor, and desired Trip Class (e.g., Class 10, 20, or 30).
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Starter Logic: Select the appropriate starter type in the configuration menu. The MM300 will automatically manage the timing and interlocking for the contactors based on your selection (e.g., Star-Delta transition timing).
FAQ: Common Questions and Answers
Q: What accessories are missing in the “W/O Accessories” version? A: This typically means the unit does not include the optional Graphical Control Panel (GCP), additional expansion I/O modules for extra digital inputs/outputs, or specialized fieldbus communication cards.
Q: Can the MM300 provide protection against phase loss? A: Yes, the MM300 monitors current unbalance; a complete loss of a phase will trigger a high unbalance alarm or trip, protecting the motor from overheating and damage.
Q: How do I reset a thermal trip? A: Once the motor has cooled down (calculated by the thermal model), you can reset the relay via the communication network, the optional front panel, or a physical digital input configured as a “Reset” button.
For high-resolution technical parameters and inventory status for the GE Multilin MM300, please contact our specialized automation team.
Recommended Similar Models
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GE Multilin MM200 (Compact Motor Protection)
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GE Multilin 369 (Enhanced Motor Management)
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GE Multilin 469 (Large Motor Management System)
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GE Multilin 869 (Next-Generation Motor Protection)
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GE Multilin 239 (Basic Motor Protection Relay)
