GE Multilin MMII-PD-1-2-240 Motor Manager II Protection Relay

Product Description

The GE Multilin MMII‑PD‑1‑2‑240 is a microprocessor-based Motor Manager II relay, engineered for 240 VAC AC motors. It provides comprehensive protection, monitoring, and control in a single compact unit. This device ensures motors operate safely and efficiently by detecting overloads, phase loss, short circuits, and abnormal conditions. Moreover, it integrates seamlessly with industrial control systems, making it ideal for modern automated production environments.

Key Features and Benefits

• Comprehensive motor protection against overloads, phase loss, and short circuits.

• Monitors current, voltage, and temperature in real-time to prevent motor damage.

• Local and remote start/stop control via relay outputs and digital interfaces.

• Event recording and diagnostics support predictive maintenance and fault analysis.

• Modular, panel-mount or DIN-rail design allows flexible installation and future expansion.

• Enhances system reliability while reducing maintenance costs through early fault detection.

Technical Specifications

• Input Voltage (Control Power): 240 VAC, 50/60 Hz

• Motor Power Range: 0.5 – 20 HP (depending on load type)

• Protection Functions: Overload, underload, phase loss, short-circuit, stall, over/under voltage, overtemperature

• Control Functions: Local/remote start-stop, relay/dry contact outputs

• Digital Inputs: 16 total (6 fixed, 10 configurable, optically isolated)

• Outputs: 4 total (2 contactor, 2 programmable relay)

• Communication Interfaces: RS485/Modbus RTU; Ethernet optional

• Operating Temperature: –20 °C to +70 °C

• Storage Temperature: –40 °C to +85 °C

• Enclosure: Panel-mount or DIN-rail, IP20 front panel (optional IP54)

• Cooling Method: Natural air

• Power Consumption: 7 VA nominal, 25 VA maximum

• Fuse: 0.5 A, 250 V fast blow, high breaking capacity

• Single Phase Accuracy: ±2 percentage points

• Dimensions: 8.3 in × 5.625 in × 5.8 in

• Weight: 4.1 lbs

Typical Applications

• Industrial pumps, fans, and compressors requiring reliable protection

• Automated production lines and motor-driven machinery

• Integration with PLCs and SCADA systems for enhanced monitoring

• Energy, water treatment, and manufacturing facilities requiring predictive maintenance

FAQ

Q1: What motor types can MMII‑PD‑1‑2‑240 protect?
A1: It protects single-phase and three-phase AC motors up to 20 HP, depending on load type.

Q2: How does it integrate with control systems?
A2: The relay offers RS485/Modbus RTU communication and optional Ethernet connectivity for PLC and SCADA integration.

Q3: Can the relay record events for maintenance purposes?
A3: Yes, it provides detailed event recording and diagnostics for fault analysis and predictive maintenance.

Q4: What are the installation options?
A4: It can be panel-mounted or installed on a DIN rail, with optional IP54 protection for harsh environments.

Q5: What is the expected lifespan of the relay under normal operation?
A5: With proper installation and operating conditions, the relay can reliably function for several years, reducing maintenance and downtime.