MC30 Relay Protection Device
The MC30 is a three-phase overcurrent and earth fault relay with programmable time-current curves, designed for versatile protection of power distribution systems.
Key Features
The MC30 relay is suitable for power distribution systems with insulated, resistance-earthed, or compensated neutral configurations. It supports selectable rated input currents of 1A or 5A at 50/60 Hz and connects through three current transformers (CTs) for accurate measurement and protection .
Protection Functions
- F49: Thermal image element for overload detection
- F50/51: Three independent overcurrent elements
- F50N/51N: Three earth fault elements
- F51BF: Breaker failure protection
Measurement and Recording
- Real-time measurements of IA, IB, IC, and Io
- Maximum demand and inrush current recording
- Trip recording for the last 20 trips with date and time
- Oscillographic waveform capture for detailed event analysis
Control and Communication
- 4 programmable output relays and 3 digital inputs
- Time-tagged multiple event recording
- Blocking outputs and pilot wire selectivity coordination
- RS485 (rear) and RS232 (front) serial communication ports
- Supports Modbus RTU and IEC 870-5-103 protocols for integration with SCADA systems
User Interface
- LCD display (2x8 characters) for local monitoring
- 4 LEDs for signalization
- 4 keys for complete local management
- Optional 9-pin RS232 socket for local communication
Installation and Build
- Compact draw-out execution for flush mounting or 19” 3U rack systems
- IP44 protection case, with optional IP54
- Supports one expansion module for additional functionality
- Power supply options: Type 1 (24V AC/DC or 110V AC) and Type 2 (80–220V AC) depending on system requirements
Applications
The MC30 is ideal for medium and low voltage power distribution networks, providing reliable protection against overcurrent, earth faults, and breaker failures. Its programmable curves and communication capabilities make it suitable for modern automated substations and integration into SCADA and energy management systems.
Documentation
For detailed operational guidance, configuration, and installation instructions, the MC30 user manual and technical datasheets are available online, providing step-by-step instructions for setup, programming, and maintenance .
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