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PRM2 – Phase Rotation & Phase Loss Monitor

Product Overview

The PRM2 Phase Rotation/Loss Monitor from m-Tronix is a next-generation protection device for three-phase electrical systems, offering reliable monitoring of phase rotation, phase loss, undervoltage, and advanced safety functions such as Earth Leakage Lockout and Frozen Contactor Protection.

Designed to meet AS2081:2011 and other relevant statutory and industry standards, the PRM2 ensures compliance and safety in critical mining and industrial environments. Compact and panel-mounted, it delivers fast, accurate phase condition monitoring for neutral-referred systems operating at voltages up to 1100V AC.

Application

Ideal for mining and general industry, the PRM2 is designed to:

Detect incorrect phase rotation (CW/CCW)
Identify phase loss conditions
Monitor undervoltage
Comply with AS2081:2011 for Earth Leakage Lockout and Frozen Contactor Protection

This makes the PRM2 an essential component in electrical safety systems for switchboards, MCCs, substations, and other three-phase applications.

Key Features

Comprehensive Phase Monitoring

Monitors Phase A, B, C and Earth
Detects Phase Loss, Undervoltage, and Rotation Direction
Identifies CW (Clockwise) and CCW (Counter-Clockwise) rotation

Relay Outputs

Phase OK Relay (voltage-free changeover contact)
CW Rotation Relay (voltage-free changeover contact)
CCW Rotation Relay (voltage-free changeover contact)

These relays allow external systems to respond to safe or unsafe phase conditions automatically.

LED Indications

Clear visual status of:

Phase A, B, C presence
Rotation Direction (CW or CCW)
Phase Loss detection

Compact, Panel-Mounted Design

Easy integration into existing panels
Ideal for tight control cabinets and MCCs

Low Power Consumption

Designed for efficient continuous monitoring with minimal power draw

Operating Principle

When all three phases are present and correct, the Phase OK relay closes, along with either the CW or CCW rotation relay (depending on detected direction).
If any phase is lost or voltage drops below threshold, all relays open, indicating a fault.
LEDs provide a clear indication of any missing phase or incorrect rotation.

Technical Specifications

Parameter	Details
System Voltage	415 V / 1100 V AC
Control Power Supply	110 V AC (for operation and remote display)
Supported Circuits	Neutral-referred 3-phase systems
Outputs	3 × Voltage-free changeover relay contacts: - Phases OK - CW Rotation - CCW Rotation
LED Indicators	Phase A, Phase B, Phase C CW/CCW rotation status
Mounting	Panel-mounted
Design Standard	Compliant with AS2081:2011

Ordering Information

Part Number	Description
A00954	PRM2 Module (Phase Rotation/Loss Monitor)
A00955	PRD Indicator Module
A01098	PRM2 – 24–48 V AC/DC Variant

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m-tronix Pty Ltd
info@m-tronix.com.au | 📞 +61 435 939 513 | 🌐 www.m-tronix.com.au