Programmable Automatic Recloser MT51A

MT51AS/ MT51AI

The MT51A Series Remote Control Auto-Recloser is an intelligent motor-driven device designed for centralized power management and circuit protection. Compatible with major circuit breakers (up to 63A), it enables users to monitor and control power status remotely via RS485 Modbus (MT51AS) or Dry Contact (MT51AI). By automatically detecting nuisance trips and reclosing the circuit, it ensures maximum power availability while providing manual, automatic, and secure lock modes for maintenance safety.

• 2/4P for RCCB and 1-4P for RCBO
• programmable reclosing logic
• 10 reclosing time delays and 10 reclosing times
• Two Control Methods: RS485 or IO

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Features & Advantages

feature

Programmable Auto-Reclosing Logic

• Customizable Reclosing Logic: Allows users to define reclosing attempts (0–9 times) and delay intervals (5s–180s) via manual dial adjustment.

• Secure Logic Lockout: Automatically enters a logic lock status and restricts the handle to the OFF position if the preset reclosing limit is exceeded.

Optional Remote Control

MT51AS RS485 control
MT51AI IO control

Enhanced Design & Superior Durability

• Standard 36 mm Modular Design: 
Featuring a standard 36mm width for the control unit, this design supports extensive functional expansion and provides more room for professional customization. It allows for flexible side-mounting on standard 35 mm DIN rails.
• Superior Durability: 
Built for longevity with a mechanical life of 20,000 operations, doubling the standard performance of domestic and foreign competitors.

Versatile Integration & Performance

High Compatibility: 
Seamlessly works with RCCB/RCBO from major brands, including Schneider, Nader, and Chint, etc., allowing for flexible system integration.
• Reliable Synchronicity: 
Features a double fulcrum parallel drive to ensure reliable and synchronized closing for 4P breakers.

Smart Feedback & Safety Security

• Advanced Safety: 
Includes a triple-mode toggle switch (Auto, Manual, Lock) and a physical safety lock jack to prevent accidental remote power-on during maintenance.
• Optional Aux Status Output: 
Provides real-time ON/OFF status feedback through a dedicated signal output port, allowing remote monitoring systems to confirm device execution.

Target

Application Areas

  • 01

    Smart Grid & Remote Monitoring

    Ideal for systems requiring the Auxiliary Output to feed status data back to a central control center.

  • 02

    Unmanned Telecom Stations

    Automatically restores power after transient faults, with RS485 capability for remote troubleshooting.

  • 03

    Industrial Maintenance

    Uses the Manual and Lock modes to provide a "logical self-locking" status, preventing accidental remote power-on while engineers are on-site.

  • 04

    Critical Infrastructure

    Fits into distribution boxes or cabinets with standard 18mm DIN rails for easy scaling in smart cities.

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