Description

ABB MT‑91‑ARC FR A Arc‑Fault Protection Operator Panel

Technical Specifications

• Product Model: MT‑91‑ARC FR A
• Brand: ABB
• Warranty: One Year
• Input Power: 24 VDC control supply
• Operating Temperature: ‑10 °C ~ +55 °C
• Storage Temperature: ‑25 °C ~ +70 °C
• Response Time: Local status refresh cycle configurable
• Protection Class: IP65 front panel / IP20 rear housing
• Accuracy Class: Arc‑flash protection system HMI operator‑interface grade
• Output Frequency: Not applicable
• Rated Current: Typical 220 mA @24 VDC
• Display: Segment LCD status display with physical function push‑buttons
• Function: Local human‑machine‑interface for arc‑fault protection relay system; alarm indication, fault‑code read‑out, parameter browsing and local reset operation
• Communication: Serial back‑plane bus connection to main arc‑fault protection unit
• Mounting: Cabinet front‑door panel‑mount installation
• System Compatibility: ABB arc‑flash protection system platform
• Diagnostics: Power‑on, fault‑event and communication‑link LED status indicators
• Humidity: 10‑90 % RH non‑condensing
• Weight: 0.41 kg
• Dimensions: Standard panel‑mount cut‑out footprint
• 

Product Overview

MT‑91‑ARC FR A is dedicated local operator panel for ABB arc‑fault protection system. It provides cabinet‑door‑mounted status visualization, fault‑code display and manual reset capability without accessing main relay rack. Operators can view arc‑fault event records and protection‑system operating status directly at local cabinet location. Widely used in medium‑voltage switch‑gear rooms and power‑distribution control‑panels. Surplus and refurbished tested spare HMI unit for power‑system protection‑panel retrofit and maintenance‑projects.

Application Notes

‑ Maintain front‑panel gasket sealing integrity after panel installation. ‑ Confirm correct back‑plane bus connection between panel and main protection unit. ‑ Verify 24 VDC supply stability before commissioning. ‑ Typical deployment: arc‑fault‑protection‑system local‑operator‑panel spare‑part stocking.