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ABB REA101 Arc Fault Protection Main Module
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- Part Number: REA101
- Brand: ABB
- Type: Arc Fault Protection Main Module
- Dimensions: 116x2.5x2cm
- Country of Origin: USA
- Barcode: 8537101190
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Additional Specifications
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Product Description
The ABB REA101, also cataloged as the REA101 Arc Fault Protection Main Module, operates as a dedicated hardware component for high-speed optical light detection and overcurrent fault discrimination within industrial and utility switchgear platforms. This central processing unit evaluates simultaneous inputs from fiber-optic light sensors and internal overcurrent monitoring blocks to identify arc flash events.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | REA101 |
| Brand | ABB |
| Origin | Finland |
| Weight | 1.1 kg |
| Dimensions | 148 mm x 160 mm x 115 mm (W x H x D) |
| Operating Temp | -10 deg C to +55 deg C |
| Power Consumption | Less than 15 W nominal auxiliary load |
| High-Speed Outputs | 2 isolated insulated gate bipolar transistor (IGBT) devices (HSO1, HSO2) |
| Relay Outputs | 1 heavy-load relay output (TRIP3) for CBFP or alarm |
| Expansion Interfaces | 2 RJ45 ports (supports up to 5 expansion modules per port) |
| Interconnect Ports | 2 optoelectronic connectors for long-distance inter-module links |
| Sensor Inputs | Supports ring fiber, radial fiber, or localized lens sensors |
| Current Monitoring | Three-phase overcurrent or two-phase plus neutral overcurrent thresholds |
Backplane Bus Communication Velocity and Network Integration
The REA101 coordinates high-speed local data transmission through dual RJ45 expansion ports, sustaining a stable backplane bus communication velocity across up to ten connected expansion modules. Inter-module data routing over long physical distances utilizes the twin optoelectronic connectors to link multiple REA101 hubs via REA105 intermediate nodes without propagation delay. This optical interface allows time-critical current status and trip commands to traverse the local network, satisfying strict deterministic networks constraints while maintaining firmware flash compatibility for adaptive phase and zero-sequence overcurrent logic scaling.
Frequently Asked Questions
Q: What is the specific mechanical advantage of utilizing IGBT high-speed outputs (HSO1 and HSO2) over traditional mechanical relays?
A: The solid-state IGBT outputs eliminate the physical moving mass and contact bounce delays inherent in mechanical relays. This layout allows the REA101 to release a trip signal to the circuit breaker trip coil within less than 2.5 milliseconds from initial arc light detection.
Q: How does the built-in self-checking system respond if a fiber-optic sensor loop breaks connection?
A: The continuous self-checking hardware transmits structural light pulses through the fiber loop to test channel integrity. If a fiber breaks or degrades below the minimum optical threshold, the system triggers the internal diagnostic alarm and locks the affected module slot to suppress false trip execution.
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