GE MMII-PD-1-2-120 | Motor Protection Relay for Automation Systems

GE MMII-PD-1-2-120 Motor Manager II 120 V AC/DC – Product Description

Overview

The GE MMII-PD-1-2-120 is an intelligent Motor Manager II relay designed for industrial motor protection. It integrates protection, metering, and control functions into a compact, panel-mounted device. Moreover, the 120 V AC/DC supply makes it suitable for installations with standard 120 V auxiliary power. This relay ensures reliable motor operation, reduces downtime, and provides detailed diagnostic data for preventive maintenance.

Technical Specifications

Attribute — Specification
Model Number — MMII-PD-1-2-120
Series — GE Multilin Motor Manager II (MMII)
Type — Motor Protection Relay
Protection Functions — Overload, short circuit, phase unbalance, phase loss, ground fault, thermal protection
Control Features — Motor start/stop sequencing, breaker control, programmable logic
Metering Functions — Current, voltage, power, energy, demand
Event Recording — Sequence of events (SOE), disturbance recording
Communication Protocols — Modbus RTU, RS485 (optional Ethernet via modules)
Power Supply — 120 V AC/DC nominal
Inputs/Outputs — Multiple digital inputs and relay outputs
Operating Temperature — –40 °C to +70 °C
Storage Temperature — –40 °C to +85 °C
Mounting — Panel-mounted compact chassis
Weight — 3.0 kg
Country of Manufacture — USA
Applications — Industrial motor protection in utilities, oil & gas, mining, and manufacturing

FAQ

Q1: What motors are compatible with this relay?
It protects low- and medium-voltage industrial motors across multiple applications.

Q2: Which protection features are included?
Overload, phase loss, phase unbalance, ground fault, short circuit, and thermal protection.

Q3: Does it support plant automation integration?
Yes, it supports Modbus RTU, RS485, and optional Ethernet for SCADA/DCS integration.

Q4: Can it record events and disturbances?
Absolutely, the relay features SOE and disturbance recording for maintenance and diagnostics.

Q5: Is the relay suitable for harsh industrial conditions?
Yes, its compact and rugged design ensures reliable performance in demanding environments.