ABB REX521BBHGLB01C Microcomputer protection relay

ABB REX521BBHGLB01C Microcomputer protection relay

Specific Parameters

• Electrical ParametersSupply Voltage: 48/110/220V DC, supporting stable operation at 80%-115% rated voltageAnalog Inputs: Basic configuration 4 current channels (4I), intermediate configuration 5 current + 1 voltage channels (5I+1U), supporting current setting range of 0.1-5InDigital I/O: 9 isolated digital inputs (24V DC), 4 high-power relay outputs (PO), 2 signal outputs (SO)Output Capacity: Continuous current capacity 5A, 0.5s current capacity 30A (PO output) / 10A (SO output), 3s current capacity 15A (PO output) / 8A (SO output)Communication Interfaces: 3 fiber optic communication ports (1 front, 2 rear), supporting LON/IEC/SPA protocolsProtection Functions: Three-stage overcurrent protection (definite/inverse time), earth fault protection (directional/non-directional), phase loss protection, inrush current detection, cable overheating protection, automatic reclosing (up to 5 times)Measurement Functions: Three-phase current measurement, neutral point current measurement, residual voltage measurement, 1-13th harmonic analysis
• Environmental ParametersOperating Temperature: -25°C to 70°C (non-condensing)Storage Temperature: -40°C to 85°CRelative Humidity: 5% to 95% (non-condensing)EMC Immunity: Complies with EN 61000-4 series standards, ESD protection ±15kV (air discharge), ±8kV (contact discharge)Vibration Resistance: 10-500Hz, 1.5g acceleration (IEC 60068-2-6 standard)
• Mechanical ParametersDimensions: 60mm (W) × 144mm (H) × 175mm (D) (19-inch 1/3 rack size)Weight: Approximately 1.8kgMounting Method: 19-inch standard rack mountingHousing Material: Flame-retardant reinforced plastic (UL 94 V-0 grade)Indicators: 3 status indicators, green (ready), yellow (start/block), red (trip)

Product Performance

The module’s logic processing cycle is ≤10ms, and the protection operation time is ≤50ms, enabling rapid fault response and tripping command triggering. Analog measurement accuracy reaches ±0.5% full scale, frequency measurement range 45-65Hz with accuracy ±0.01Hz, and the second harmonic ratio setting range for inrush current detection is 5%-50%.

It supports 5 automatic reclosing operations with configurable intervals of 0.05-300s, featuring “select-before-operate” control logic and Lockout self-holding function to prevent misclosing. Event recording resolution is 1ms, capable of storing 1000 event records and 50 disturbance recording data with a maximum duration of 3.4s. Fault information is uploaded in real time via fiber optic communication.

Built-in comprehensive self-diagnostic system can detect 18 types of faults including power abnormality, communication interruption and I/O channel failure, with diagnostic coverage ≥99%. When a fault occurs, the green ready indicator flashes and the IRF alarm output is activated. Mean Time Between Failures (MTBF) is ≥1,000,000 hours (25℃ environment), supporting online parameter setting and configuration modification. Parameters are stored in non-volatile memory and not lost after power failure.