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General| Product ID | REJ 521 |
|---|---|
| Frequency | 50/60 Hz |
| Mounting | DIN Rail |
| Display | LCD |
| Operating temperature range | -25 °C to +55 °C |
| Type | Relay |
| Product Type | REJ 521 |
| Product Name | REJ 521 |
| Rated Voltage | 24-250 V DC |
| Current Input | 1 A |
| Communication Protocols | IEC 61850 |
| Protection Functions | Overcurrent, Earth Fault |
Provides basic information on the REJ 521 relay and its Human-Machine Interface (HMI).
Details the intended use of the REJ 521 in medium voltage distribution networks and its microprocessor environment.
Lists protection stages, disturbance recorder, event memory, and communication capabilities.
Instructions on inquiring about the relay's guarantee from an ABB representative.
Warns about dangerous voltages, ESD sensitivity, grounding, and requires qualified personnel for installation.
Describes the front panel components, LCD display, and basic display operation modes.
Explains how to use navigation buttons and clear/enter buttons for relay control.
Details how to select the display language and navigate through the relay's menus.
Explains user/technical levels, monitoring measured values, recorded data, and INFO section.
Details LED indications (Ready, Start, Trip) and text messages on the LCD.
Explains REJ 521's design for medium voltage systems and preloaded software.
Covers maintenance-free operation, visual inspection for damage, and contacting ABB for service.
Details function tests, binary input tests, and LED tests for verifying relay operation.
Outlines procedures for testing earth-fault stages and self-supervision systems.
States that no separate spare parts are supplied due to component calibration.
Directs users to the Technical Reference Manual for ordering details.
Lists the Technical Reference Manual and Installation Manual.
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