ABB MT-91-ARCFPA Arc Fault Protection Device (AFDD)

Description

Product Detail: ABB MT-91-ARCFPA Arc Fault Protection Device (AFDD)

Overview

The ABB MT-91-ARCFPA is a state-of-the-art Arc Fault Protection Device (AFDD), meticulously engineered to significantly enhance electrical fire prevention in final circuits. By continuously monitoring the electrical waveform for the unique signatures of dangerous arc faults, it provides a critical layer of protection that goes beyond the capabilities of standard circuit breakers (MCBs) and Residual Current Devices (RCDs). This device is essential for safeguarding homes, commercial buildings, and public facilities against one of the leading causes of electrical fires.

Key Features & Benefits

• Advanced Fire Prevention: Proactively detects and interrupts both parallel arc faults (line-to-line/neutral) and series arc faults (in a single series conductor, e.g., a damaged or loose wire) before they can generate sufficient heat to ignite a fire.

• Integrated Protection: Combines the functions of an Arc Fault Detection Device (AFDD), a Miniature Circuit Breaker (MCB – Type B curve), and optionally a Residual Current Device (RCD) in a single, compact unit, simplifying panel design and installation.

• High Noise Immunity: Sophisticated algorithms allow the device to differentiate between dangerous arc faults and normal, safe arc-ing phenomena (e.g., from commutator motors in vacuums or drills), minimizing nuisance tripping.

• Self-Test Functionality: Features an integrated automatic self-test circuit that regularly verifies the health of the arc detection electronics, ensuring ongoing reliability and providing peace of mind.

• Clear Status Indication: Equipped with an LED indicator that provides clear visual feedback on the status of the device (e.g., ON/OFF, tripped due to arc fault), aiding in quick diagnostics and troubleshooting.

• Compatibility & Mounting: Designed for easy installation on a standard 35mm DIN rail, ensuring full compatibility with existing ABB distribution boards and enclosures.

Technical Specifications

Parameter Specification

Model ABB MT-91-ARCFPA

Device Type Arc Fault Detection Device (AFDD) with integrated MCB

Rated Current (In) 16 A

Rated Voltage (Ue) 230 V AC

Rated Frequency 50/60 Hz

Breaking Capacity 6 kA

Tripping Characteristic Type B (Standard short-circuit protection)

MT-91-ARC FP

Number of Poles 1 Pole + Neutral (1P+N)

Arc Fault Detection Detects Series and Parallel Arc Faults

RCD Integration Note: The -ARCFPA suffix typically denotes the version without integrated RCD. Models with -ARC may include it. Please verify the specific product code.

Status Indication LED Indicator

Mounting 35mm DIN Rail

Standards Compliance IEC 62606 (General requirements for AFDDs), IEC 61009-1 (for integrated MCB/RCD functions)

Safety Approvals CE Marked, KEMA Certified, and other international standards

Note: It is critical to confirm the exact specification, particularly regarding RCD integration, with the official ABB datasheet or product manual, as codes can vary by region and production batch.

Why Arc Fault Protection is Essential

Standard overcurrent devices (MCBs) protect cables from overloads and short circuits but cannot detect the low-level current arcing that often causes electrical fires. These arcs can occur due to:
• Damaged or pinched electrical cords (e.g., behind furniture).

• Loose or corroded connections in terminals and outlets.

• Degraded insulation on aged wiring.

The ABB MT-91-ARCFPA is specifically designed to identify these hazardous conditions and disconnect the circuit, preventing a potential fire.

Typical Applications

The MT-91-ARCFPA is highly recommended for protecting circuits where the risk of fire is a paramount concern, such as:
• Residential Buildings: Bedrooms, living areas, and especially in sleeping accommodations where early warning is critical.

• Commercial Properties: Hotels, hospitals, nursing homes, and schools.

• Historical Buildings: Structures with older wiring systems that may be more susceptible to insulation degradation.

• Final Circuits: Powering sockets outlets and lighting circuits, as specified by national wiring regulations (e.g., IEC 60364).

Compatibility & Integration

This device is part of the comprehensive ABB MT series, designed for seamless integration into ABB’s range of consumer units and distribution boards. Its compact design allows for efficient use of space within the enclosure.

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