ABB MT-91-ARCFPA Arc Flash Protection Relay

Description

Technical Specifications

Core Electrical Parameters

• Auxiliary Power Supply: 24 VDC (18–30 VDC wide range)
• Power Consumption: Typical 3.5 W
• Sensor Interface: Fiber‑optic input (FP = Fiber Port); supports up to 8 sensor channels via expansion modules
• Trip Output Relays: 2 sets of NO/NC contacts; rated 250 VAC / 30 VDC, 5 A
• Typical Operating Time: <5 ms (from light detection to relay actuation)
• Isolation Voltage: Input/output/communication isolation ≥ 1000 VAC (1 minute)
• Insulation Resistance: Input/output ≥ 100 MΩ (1 minute)

Mechanical & Environmental

• Mounting: 35 mm DIN‑rail mounting
• Dimensions: 47 × 131 × 111 mm (W × H × D)
• Weight: Approx. 0.4 kg
• Operating Temperature: -25°C to +70°C
• Storage Temperature: -40°C to +85°C
• Relative Humidity: 0%–95% RH, non‑condensing
• Ingress Protection: IP20 (for internal switchgear installation)
• EMC Compliance: IEC 61000‑4 series; surge protection ≥ 2 kV
• Certifications: IEC 60255, IEC 62271‑200, CE, EMC compliance

Communication & Interfaces

• Communication Ports: Optional RS485; supports integration with upper‑level control systems
• Diagnostics Interface: Dedicated port for configuration and fault logging
• Status Indicators: LED indicators for power, sensor status, trip, and fault conditions

Key Functional Features

Ultra‑Fast Arc Detection & Tripping

• Detects arc flash light via fiber‑optic sensors with <5 ms response time, far faster than conventional overcurrent protection.
• Triggers circuit breaker tripping to limit arc energy and prevent catastrophic equipment failure and injury.
• Operates independently of current magnitude, ensuring protection for low‑level arcing faults.

Flexible Sensor Configuration

• Supports up to 8 fiber‑optic sensor channels via expansion modules, covering multiple switchgear compartments.
• Fiber‑optic sensors provide immunity to electromagnetic interference (EMI) and enable safe monitoring in high‑voltage zones.
• Sensors can be positioned at critical points (busbars, circuit breakers, cable terminations) for comprehensive coverage.

Robust Protection & Reliability

• Built‑in over‑voltage, over‑current, and short‑circuit protection for the module and connected sensors.
• Galvanic isolation between sensor inputs, power supply, and output relays eliminates ground loops and noise.
• Self‑diagnostic functions continuously monitor sensor integrity, power supply, and module health.

Easy Integration & Configuration

• DIN‑rail mount design simplifies installation in standard control cabinets.
• Configurable via dedicated software or front‑panel indicators for sensitivity and trip settings.
• Compatible with ABB and third‑party circuit breakers and switchgear systems.
• Optional RS485 communication enables remote monitoring, fault logging, and integration with SCADA systems.

Hazardous Area Compatibility

• Designed for use in industrial environments with high arc flash risk.
• Complies with strict safety standards for electrical equipment in manufacturing and utility applications.

Application Scenarios

Electrical Distribution & Switchgear

• Medium‑Voltage Switchgear: Protects main distribution panels, busbar chambers, and feeder cabinets in power substations.
• Low‑Voltage Motor Control Centers (MCC): Safeguards motor starters, variable frequency drives, and control circuits in industrial plants.
• UPS & Data Center Power Systems: Prevents arc faults in critical power distribution units, avoiding IT system downtime.

Oil & Gas Industry

• Refineries & Petrochemical Plants: Protects electrical equipment in hazardous areas with flammable gases and vapors.
• Offshore Platforms: Ensures safety in topside power distribution systems where arc flash risks are severe.
• Pipelines & Pump Stations: Safeguards control panels and motor drives in remote pumping facilities.

Manufacturing & Heavy Industry

• Steel & Metal Processing: Protects switchgear in rolling mills, smelters, and foundries with high electrical loads.
• Cement & Mining: Safeguards power distribution in crushers, mills, and conveyor systems.
• Automotive Manufacturing: Protects control cabinets in assembly lines and robotic workcells.

Power Generation & Utilities

• Thermal & Hydro Power Plants: Protects generator switchgear, auxiliary power systems, and substation equipment.
• Renewable Energy: Safeguards inverter stations and grid connection switchgear in solar and wind farms.
• Urban Power Grids: Enhances safety in distribution substations and commercial building electrical rooms.

Marine & Offshore

• Shipboard Electrical Systems: Protects main switchboards and motor control centers on vessels and drilling rigs.
• Offshore Wind Farms: Safeguards transformer and inverter cabinets in marine environments.

Infrastructure & Commercial

• Hospitals & Healthcare Facilities: Protects critical power systems for life‑support equipment.
• Data Centers & Server Rooms: Ensures uptime by preventing arc faults in power distribution units.
• Metro & Rail Transit: Safeguards traction power substations and signaling systems.