Smart Auto-Recloser MT84SR

MT84SR

The MT84SR Smart Auto-recloser is a high-performance Alot electrical device designed to automate and protect your power systems. It serves as a motorized actuator that fits 1P-4P Hager circuit breakers, allowing for seamless remote management via RS485 Modbus-RTU protocols. Whether for industrial automation or smart city infrastructure, this device ensures your power stays on safely.

• 1-4P Hager circuit breaker, up to 125A
• Over/Under Voltage, Leakage, Overload, and Phase Loss.
• Customizable retry logic for current and leakage faults.
• Real-time LCD display of 3-phase voltage and leakage levels.
• Built-in RS485 Modbus for smart grid integration.
• Event logging with time stamps and supercapacitor backup.

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Features & Advantages

feature

Main Technical Features

• Remote and Local Control: You can control it from far away using RS485 (Modbus-RTU) or locally using Dry Contact ports.
• Wide Compatibility: It is designed to work perfectly with Hager brand circuit breakers from 1P to 4P.
• Full Protection: It provides protection against over-voltage, under-voltage, overload, and short circuits.
Multiple Working Modes: It has three modes: Mode 1 (Auto-reclose), Mode 2 (Remote control only), and Mode 3 (Maintenance).
• Clear Status Lights: It uses different LED colors (green, red, and orange) to show if the power is normal, has a voltage problem, or is in maintenance mode.
• Standard Mounting: It is easy to install on a standard 35 mm DIN rail.

Performance Advantages

• High Reliability and Durability: The device has a mechanical life of over 20,000 operations, which is twice as high as many other products.
• Fast Operation Speed: It can open or close very quickly, performing more than twice as fast as similar devices.
• Smart Reclosing Logic: It can tell if the power was turned off by a person or by a fault. If there is a fault, it can try to turn the power back on automatically.
• Enhanced Safety: The physical Safety Lock (Lock mode) prevents the device from being turned on by mistake during maintenance.
• Energy Efficient: The device uses very little power during standby, making it environmentally friendly.
• Better Synchronized Closing: It uses a dual-point drive to make sure that 3P and 4P breakers close perfectly at the same time.

Target

Application Areas

  • 01

    Telecommunication Base Stations

    It provides automatic reclosing after current faults to ensure the network stays online without needing a technician to visit remote sites.

  • 02

    Unmanned Equipment Rooms

    It protects sensitive equipment by using over-voltage and under-voltage protection to cut power during unstable voltage and restore it when safe.

  • 03

    Industrial Automation 

    It integrates with PLC systems to provide real-time status monitoring of circuit breakers, helping managers track power health.

  • 04

    Smart Buildings and Commercial Chains 

    It offers a safety lock (Lock Mode) for maintenance, ensuring that the power cannot be turned on by remote command while people are working on the lines.

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