ABB RXEDK2H 1MRK000841-KA

The device is engineered to handle large short-circuit currents, provide rapid fault isolation, and ensure minimal maintenance over a long operational lifespan. It is a key component in ABB’s portfolio for modernizing electrical infrastructure and ensuring uninterrupted power supply.

Technical Specifications

The specifications below are derived from the standard RXEDK2H series configuration and typical industrial applications for this order code:

• Product Series: RXEDK2H (High-Voltage Vacuum Circuit Breaker).
• Order Code: 1MRK000841-KA (Specific configuration identifier).
• Voltage Class:
  • Rated Voltage: Typically 12 kV to 38 kV (Medium Voltage).
  • Insulation Level: Complies with IEC 62271-1 standards (e.g., 28 kV/75 kV for 12kV rating).
  • Frequency: 50 Hz / 60 Hz.
• Current Rating:
  • Rated Normal Current: 630 A, 1250 A, or 2000 A (depending on specific configuration).
  • Rated Short-Circuit Breaking Current: 20 kA, 25 kA, or 31.5 kA.
  • Rated Short-Time Withstand Current: 20 kA / 3s (or higher).
  • Rated Peak Withstand Current: 50 kA (or higher).
• Operating Mechanism:
  • Type: Spring-charged mechanism (motor-charged or manual-charged).
  • Operating Voltage: 110/130 VDC or 220/240 VAC (for closing/tripping coils and motor).
• Physical Characteristics:
  • Type: Draw-out or Fixed type (Draw-out allows for easy maintenance and replacement).
  • Dimensions: Compact design suitable for metal-clad switchgear (e.g., KYN28-12 cabinets).
  • Weight: Approximately 80 kg to 150 kg (varies by current rating).
• Environmental Parameters:
  • Operating Temperature: -15°C to +40°C.
  • Storage Temperature: -40°C to +70°C.
  • Altitude: Up to 1000 meters (standard), up to 3000 meters with derating.
  • Humidity: < 95% RH (non-condensing).
  • Pollution Degree: Class II or III.

Functional Features

• Vacuum Interruption Technology:
  • Utilizes sealed vacuum bottles (interrupters) that provide excellent arc-quenching capabilities.
  • Ensures long contact life (up to 10,000 to 30,000 operations) without maintenance.
  • Eliminates the risk of fire or explosion associated with oil circuit breakers.
• High-Speed Protection:
  • Extremely fast tripping time (typically < 60ms) to minimize damage to downstream equipment during short circuits.
  • Capable of breaking high fault currents instantly to isolate the defective section of the network.
• Advanced Control and Monitoring:
  • Equipped with auxiliary switches for signaling (ON/OFF/TRIP/SPRING CHARGED).
  • Compatible with protection relays (e.g., ABB REL series) for integrated automation.
  • Supports motorized charging and tripping for remote control via SCADA systems.
• Safety and Reliability:
  • Features a visible break gap for safe isolation during maintenance.
  • Includes anti-pumping logic to prevent repeated closing onto a fault.
  • Robust mechanical locking mechanisms prevent accidental operation.
  • Low noise operation during switching.
• Low Maintenance:
  • The vacuum interrupter and operating mechanism are sealed and require no lubrication or adjustment for the life of the device.
  • Modular design allows for quick replacement of the draw-out unit.

Application Scenarios

The ABB RXEDK2H 1MRK000841-KA is a versatile solution deployed across a wide range of critical infrastructure and industrial sectors:

• Power Distribution Networks:
  • Secondary Substations: Protection of transformers and feeder lines in 10kV to 35kV distribution networks.
  • Ring Main Units (RMU): Used in compact switchgear for urban power distribution.
  • Cable Branching Boxes: Protection of underground cable networks.
• Industrial and Commercial Facilities:
  • Heavy Industry: Steel mills, cement plants, and mining operations requiring high-reliability power interruption.
  • Data Centers: Protection of critical power feeds (UPS output, generator connections).
  • Petrochemical & Oil & Gas: Explosion-proof or robust configurations for hazardous areas.
• Renewable Energy Integration:
  • Wind Farms: Collection system protection (box transformers) and grid connection switchgear.
  • Solar Power Plants: Inverter output protection and step-up transformer protection.
  • Hydroelectric Power: Generator circuit protection.
• Infrastructure and Transportation:
  • Railway Electrification: Traction substations for electric trains and metros.
  • Airports and Ports: Power supply for lighting, baggage handling, and docking systems.
  • Marine and Offshore: Shipboard power distribution and shore-power connection systems.
• Specialized Applications:
  • Arc Furnace Protection: High-current switching capabilities for metallurgical applications.
  • Capacitor Bank Switching: Capable of handling high inrush currents for power factor correction.