Overview
Specification
| Parameter | Value |
|---|---|
| Model | RET 521 |
| ABB Part Number | 1MRK-504-035-BEN |
| Module Type | Feeder & Transformer Protection Terminal |
| Voltage Rating | 3.3 kV to 36 kV AC |
| Current Rating | Up to 5 A primary, configurable |
| Protection Functions | Overcurrent, Earth Fault, Differential, Thermal, Restricted Earth Fault |
| Communication Protocols | IEC 61850, Modbus, DNP3 |
| Input/Output Interfaces | Digital/Analog I/O configurable |
| Measurement Accuracy | ±0.2% typical for current and voltage |
| Event Recording Capacity | Up to 1024 events with timestamp |
| Operating Temperature | -20°C to 70°C |
| Storage Temperature | -40°C to 85°C |
| Operating Humidity | 5–95% non-condensing |
| Mounting | Panel-mounted or DIN rail compatible |
| Dimensions | 160 x 120 x 90 mm |
| Weight | 1.5 kg |
| MTBF (Mean Time Between Failure) | ≥100,000 hours |
FAQ
It provides comprehensive protection for feeders and transformers, including overcurrent and differential protection.
IEC 61850, Modbus, and DNP3 for SCADA and industrial automation integration.
Yes, it supports temperatures from -20°C to 70°C and 5–95% humidity non-condensing.
The terminal can be panel-mounted or installed on DIN rails using standard connectors.
Power generation, industrial facilities, substations, and critical infrastructure installations rely on it.
Manual/Datasheet PDF
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