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The ABB REX010 HESG324426R0001 HESG324389 is a high-reliability redundant power supply module designed for ABB’s Relion® protection relays and automation systems. Engineered to deliver uninterrupted 24 V DC output in mission-critical substations and industrial environments, this dual-input module accepts a wide voltage range (24–250 V DC/110–230 V AC), enabling seamless integration across global power standards. The ABB REX010 features active load sharing and galvanic isolation between inputs/outputs, preventing ground loops while supporting parallel operation for N+1 redundancy. Its hot-swappable design minimizes downtime during maintenance, and integrated diagnostics monitor voltage ripple, overloads, and thermal conditions via relay alarm contacts. With SIL 1 certification and compliance with IEC 61850-3 for electromagnetic immunity, the REX010 ensures continuous operation of protection relays like REF615 series in harsh electrical environments.
ABB REX010 HESG324426R0001 HESG324389
Technical Specifications
| Parameter | Value |
| Product Model | REX010 (HESG324426R0001 / HESG324389) |
| Manufacturer | ABB |
| Product Type | Redundant Power Supply Module |
| Input Voltage | 24–250 V DC / 110–230 V AC (auto-sensing) |
| Output Voltage | 24 V DC (±1%) |
| Output Current | 5 A (continuous) |
| Redundancy | Active parallel operation (N+1) |
| Efficiency | 89% (typical) |
| Isolation | 1500 V AC input-to-output |
| Alarm Contacts | 2 x changeover relays (overload/temp/fail) |
| Operating Temperature | –40°C to +70°C |
| Cooling | Convection (no fan) |
| Certifications | IEC 61850-3, IEEE 1613, SIL 1 |
| Dimensions | 124 x 45 x 117 mm (H x W x D) |
Main Features and Advantages
Ultra-wide input range: Single-module compatibility with DC/AC sources (24–250 V DC or 110–230 V AC) eliminates region-specific variants, reducing spare parts inventory by 60%.
True redundancy: Active current sharing allows parallel connection of multiple ABB REX010 units with ≤2% load imbalance, ensuring zero transfer time during failover.
Robust electrical protection: Integrated surge suppression (IEC 61000-4-5 Class 3) and reverse polarity protection withstand substation transients. Galvanic isolation prevents noise propagation to sensitive IEDs.
Maintenance optimization: Hot-swap capability enables module replacement without system shutdown. LED status indicators and relay alarms provide instant fault localization. The fanless design avoids dust accumulation in polluted environments.
Application Field
The ABB REX010 HESG324426R0001 HESG324389 secures power continuity for critical protection systems:
Electrical Substations: Primary power source for REF615 relays in 110 V DC/230 V AC switchgear panels.
Industrial Plants: Redundant feed for motor protection relays in steel mills with unstable mains voltage.
Renewable Energy: Grid-tie inverter control cabinets requiring SIL 1-compliant power supplies.
Transportation: Railway signaling systems demanding –40°C cold-start capability.
Marine: Engine control rooms with vibration resistance (IEC 60068-2-6).
Related Products
REX120: 20 A redundant power supply for high-load systems.
REF615: Feeder protection relay powered by REX010.
SDCS-POW-24: DIN-rail mounting kit for REX010.
HESG324000R1: Filter module for EMI-sensitive environments.
TA100: Terminal adapter for direct relay integration.
REx521: Generator protection compatible with REX010.
ABB REX010 HESG324426R0001 HESG324389
Installation and Maintenance
Pre-installation preparation: Verify input voltage compatibility with local standards. Ensure minimum 10mm clearance for heat dissipation. Use 2.5 mm² copper wiring for input/output connections. Ground chassis via dedicated terminal (PE).
Maintenance recommendations: Monitor output voltage ripple annually (max. 150 mV pp). Replace modules if LED status indicates degradation. Clean ventilation slots biannually in high-dust environments. For redundant setups, stagger replacement intervals by 12 months.
