Overview

The ABB RK732105-CA, also known by its type designation RXTUG 21HU1DC110-250V, is a robust DC converter module engineered for demanding industrial and utility environments. It is part of ABB’s trusted RXTUG series, widely used in high-voltage protection and control systems. This converter is designed to deliver regulated DC output for relays, IEDs, and auxiliary control circuits, even under fluctuating input conditions.

Moreover, the RK732105-CA features a compact footprint and rugged construction, making it ideal for panel integration in substations, switchgear, and control cabinets. Its high reliability and long service life reduce maintenance needs and ensure continuous operation in mission-critical applications. In addition, the unit complies with international standards for electromagnetic compatibility and insulation, ensuring safe and interference-free performance.

Technical Data

Typical Applications

• Substation Automation Systems: Provides stable DC power to protection relays, control logic, and communication modules.

• High-Voltage Switchgear Panels: Powers auxiliary circuits in GIS and AIS systems operating at 110 kV and above.

• Industrial Control Cabinets: Ensures reliable DC supply for PLCs, sensors, and interlocking devices in manufacturing plants.

• SCADA and RTU Power Supply: Supports uninterrupted operation of remote terminal units and data acquisition systems.

• Legacy System Upgrades: Ideal for replacing aging DC converters in ABB protection schemes with minimal reconfiguration.

For example, utilities across Europe and Asia have deployed RK732105-CA in 220 kV and 500 kV substations to ensure uninterrupted relay operation during voltage fluctuations. Additionally, its wide input range makes it suitable for systems with variable DC bus voltages or backup battery banks.

FAQ

Q: What is the input voltage range of RK732105-CA?
A: It operates from 110V to 250V DC, making it suitable for a wide range of substation power systems.

Q: What is the typical use of this DC converter?
A: It supplies regulated DC power to protection relays, control logic, and communication devices in substations.

Q: Is RK732105-CA compatible with ABB REX or REB series relays?
A: Yes, it is designed to support ABB’s protection relay families, including REB103 and REX series.

Q: Can it be used in outdoor installations?
A: It is typically installed inside control panels or relay cabinets, which may be housed in outdoor-rated enclosures.

Q: Is RK732105-CA still available for purchase?
A: Yes, it is available as a new product and supported by ABB’s global distribution network.