$3,620.00 Original price was: $3,620.00.$1,199.00Current price is: $1,199.00.
The ABB MT-91-ARCFPA is a specialized arc flash protection relay, designed to detect arc flash incidents in low-to-medium voltage electrical systems within milliseconds, triggering rapid circuit interruption to minimize equipment damage and safety risks.
| Parameter | Details |
|---|---|
| Model | MT-91-ARCFPA |
| Manufacturer | ABB |
| Product Type | Arc Flash Protection Relay |
| Core Functions | Arc flash detection (light + current-based); millisecond-level fault response; multi-zone protection; fault event logging; remote status monitoring |
| Detection Method | Dual-input: UV/visible light sensor (arc detection) + current sensor (fault current verification) |
| Response Time | ≤ 5 ms (from arc detection to output signal) |
| Protection Zones | Up to 8 configurable zones (via external sensors) |
| Input Interfaces | 8 light sensor inputs (for zone detection); 2 current transformer (CT) inputs (5 A secondary) |
| Output Interfaces | 4 relay outputs (250 V AC/30 V DC, 5 A max; for circuit breaker tripping); 1 alarm relay output |
| Communication Interface | RS-485 (Modbus RTU; for remote monitoring and parameter setting) |
| Power Supply | 24 V DC ±15% |
| Power Consumption | 8 W max |
| Operating Temperature Range | -20°C to +70°C |
| Storage Temperature Range | -40°C to +85°C |
| Relative Humidity | 5% – 95% RH (non-condensing) |
| Protection Rating | IP40 (front panel); IP20 (rear terminals, when installed in cabinet) |
| Dimensions (W × H × D) | 144 mm × 100 mm × 180 mm |
| Weight | 1.2 kg |
| Mounting Type | Panel-mounted (19-inch rack, 1U height) |
| Certifications | CE, UL, IEC 61850 (for substation integration), IEC 62271-205 (arc flash protection standard) |
| Key Features | LCD display (shows zone status, fault data); LED indicators (power, alarm, zone activation); password protection for settings; self-diagnostic function |
| System Compatibility | ABB low/medium voltage circuit breakers; external arc flash light sensors; substation automation systems; SCADA |
| Applications | Low/medium voltage switchgear; industrial power distribution panels; data center electrical systems; renewable energy (solar/wind) inverter cabinets |
AC 800M is a family of rail-mounted modules, consisting of CPUs, communication modules, power supply modules and various accessories. There are several CPU modules to choose from, ranging from single units with medium processing power and memory to fully redundant units with high processing power.

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