Recloser with Insulation Fault Detection MT51SD

MT51SD

Prioritize safety with the recloser with insulation fault detection MT51SD from Matismart. Unlike standard devices, our recloser with insulation fault detection performs a critical diagnostic check on line insulation before every reclose attempt. By integrating real-time "monitoring and control" capabilities, the MT51SD ensures that power is only restored when the environment is safe, preventing fire hazards and equipment damage in unmanned telecom sites and industrial facilities.

• • 2/4P for RCCB and 1-4P for RCBO
• Programmable reclosing logic
• 10 reclosing time delays and 10 reclosing times
• Built-in logic to prevent closing on faults.
• 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.

2-in-1 Remote Control Methods & 
Pre-closing Insulation Check

→ Supports both RS485 and IO control in one device
→ Insulation Detection is only performed before automatic reclosing
① When resistance (Rg ≤ 8 kΩ), automatic reclosing is forbidden 
 · The device's indicator light is solid yellow, and the system outputs an IM Fault alarm;
②When resistance (Rg ≥16kΩ), automatic reclosing is allowed 
 · The device's indicator light slowly flashes red, and it enters automatic reclosing;
③ The insulation fault state is cleared within 15 minutes
 · Automatically exits the fault state, restores the reclosing logic, and continues to execute the remaining closing process.
④ The insulation fault state persists for ≥15 minutes
 · Enters "Permanent Fault Protection State," prohibiting all remote and local control operations. 
⑤ Press RESET for 3 seconds after clearing the fault.

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 10,000 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 circuit 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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