Description
System Role and Integration
The 5A26304G02 serves as the central power distribution hub within the Ovation Distributed Control System cabinet architecture, functioning as the critical interface between facility AC power and the various I/O subsystems requiring auxiliary power. As a Power Distribution Panel, it mounts within standard Ovation enclosures and manages the protected distribution of 120VAC/240VAC power to multiple backplane assemblies including the CBO (Controller Backplane), ROP (Relay Output Panel), TND (Termination Distribution), RRP (Remote Relay Panel), and RRB (Remote Relay Base) configurations.
This module occupies a fundamental position in the Ovation power hierarchy, positioned downstream of the main cabinet circuit breakers and upstream of the individual I/O personality modules. It provides the necessary circuit protection and isolation that allows maintenance personnel to de-energize specific I/O sections without affecting entire controller racks—a significant safety and operational advantage during online maintenance in power generation and process control environments.
5A26304G02
Core Functionality and Signal Handling
The module receives AC power input and distributes it through protected branches to field termination assemblies and I/O backplanes. The integrated 15A fast-acting 3AB fuses (EX06009) serve as the main protection for the panel, while downstream 5A micro-fuses (4A00120H01) protect individual auxiliary power branches feeding specific backplane slots and panel sections.
The 5A26304G02 provides distinct auxiliary power outputs for:
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CBO Backplane (3A99200G01-G02): 4 branch circuits (F1-F4)
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ROP Panel (4D33922G01): Multiple branches including F1, F2, F7, F8
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TND Panel (4D33924G01): Distributed branches F1, F2, F6, F7
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RRP Panel (3A99252G01): Branch circuits F1, F2
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RRB Panel (3A99253G01): Branch circuits F1, F2
This distributed architecture ensures that faults in one I/O section do not cascade to others, while the modular fuse configuration allows rapid replacement of individual branch protection without disturbing the entire system power.
Platform Heritage and Operational Benefits
Manufactured in collaboration with Phoenix Contact (evidenced by the 528794 Rev B designation found on component labels), the 5A26304G02 benefits from industrial-grade power distribution technology integrated into the Ovation platform. The panel design reflects decades of field deployment in mission-critical power generation facilities where reliable auxiliary power distribution is essential for continuous operation.
The compact form factor—approximately 27.3 cm × 7.6 cm × 7.6 cm—optimizes cabinet space while providing high-density power distribution capabilities. The 24VDC system integration ensures compatibility with standard Ovation power supplies, while the robust mechanical construction withstands the thermal and vibration stresses characteristic of boiler control rooms and turbine auxiliary cabinets. Revision levels (Rev 4, Rev 7 documented) indicate ongoing manufacturing updates while maintaining backward compatibility with existing installations.
Part 4: Technical Specifications
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Model Number: 5A26304G02
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Manufacturer: Westinghouse Electric Corporation (Ovation product line, manufactured with Phoenix Contact technology)
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Product Type: Power Distribution Panel
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Input Power: 120/240 VAC (system-dependent)
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Main Fuse Protection: 15A, 250V, fast-acting (3AB type), Part Number EX06009
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Branch Fuse Protection: 5.0A, 250V, fast-acting micro-fuses (Part Number 4A00120H01)
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Compatible Backplanes/Panels: CBO (3A99200G01-G02), ROP (4D33922G01), TND (4D33924G01), RRP (3A99252G01), RRB (3A99253G01)
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Fuse Positions (Main): F1, F2 (15A AC Main fuses)
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Auxiliary Circuits: Multiple 5A branch circuits per backplane type
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Construction: Industrial power distribution assembly with Phoenix Contact components
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Operating Temperature: -10°C to +60°C (per associated documentation)
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Storage Temperature: -40°C to +85°C
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Dimensions: 27.3 cm × 7.6 cm × 7.6 cm (module); 16 cm × 16 cm × 12 cm (packaging)
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Weight: 0.3 kg (module); 0.8-1.0 kg (with packaging)
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Mounting: Panel mount within Ovation cabinet enclosures
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System Integration: 24VDC control system compatible
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Revision Levels: Rev 4, Rev 7, Rev B (Phoenix Contact) documented
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Certifications: CE, RoHS compliant
5A26304G02
Part 5: Core Features & Customer Value
Centralized Protected Power Distribution: The panel consolidates auxiliary power distribution for multiple I/O backplanes into a single protected assembly, eliminating the need for individual circuit protection at each backplane. For maintenance personnel, this centralization simplifies troubleshooting—technicians can verify power status and replace fuses at one location rather than tracing wiring through crowded cabinets, significantly reducing mean time to repair (MTTR) during power-related faults.
Hierarchical Circuit Protection: The dual-level fusing architecture (15A main protection plus 5A branch protection) provides selective coordination that isolates faults to specific circuits without affecting the entire I/O cabinet. When a field wiring fault occurs in a specific backplane section, only the affected 5A branch fuse clears, maintaining power to critical controller sections and allowing continued operation of non-affected I/O while repairs are scheduled.
Modular Branch Architecture: The panel supports diverse Ovation backplane configurations (CBO, ROP, TND, RRP, RRB) through standardized auxiliary power outputs, enabling flexible cabinet configurations without custom power wiring. System integrators can mix I/O types within a single cabinet while maintaining consistent power protection schemes, reducing engineering time and sparing complexity for facilities with heterogeneous I/O requirements.
Phoenix Contact Industrial Grade Construction: The use of Phoenix Contact power distribution technology (evidenced by component markings) ensures industrial-grade reliability with DIN-rail compatible mounting, high-quality fuse holders, and robust terminal connections designed for continuous vibration environments. This construction quality translates to reduced maintenance events and longer service life compared to generic power distribution assemblies, particularly important in power plant turbine halls and rotating equipment enclosures.
Clear Fuse Identification and Accessibility: The panel layout provides clear labeling and access to both main (15A) and branch (5A) fuses, allowing rapid identification of faulted circuits during maintenance outages. The standardized fuse types (3AB for main, micro-fuse for branches) ensure that correct replacement parts are readily identifiable, reducing the risk of improper fuse replacement that could compromise protection coordination.
Part 6: Typical Applications
Power Generation I/O Cabinet Power Management: The 5A26304G02 is extensively deployed in coal-fired, gas-fired, and combined-cycle power plants as the auxiliary power distribution center for Ovation I/O cabinets. In turbine control cabinets, the panel distributes power to the CBO backplane housing the main controller processor while simultaneously feeding ROP panels for relay outputs and TND panels for field termination—providing coordinated protection for the critical control infrastructure that manages unit load, turbine speed, and safety systems.
Boiler Burner Management Systems: Within boiler control enclosures, this panel manages auxiliary power distribution to multiple I/O subsystems including flame scanner input modules, fuel valve relay outputs, and combustion air flow analog inputs. The hierarchical fusing ensures that a fault in a field device (such as a failed flame scanner or shorted solenoid valve) clears only the affected branch circuit, maintaining power to the safety-critical master fuel trip relays and preventing unnecessary unit trips during non-critical device failures.
Water Treatment and Balance-of-Plant Control: In demineralizer, cooling tower, and auxiliary system control cabinets, the panel provides protected power to distributed I/O nodes serving chemical feed pumps, cooling fan motor starters, and process water flow instrumentation. The compact footprint allows installation in smaller auxiliary system cabinets where space is constrained, while the modular branch configuration accommodates varying I/O densities typical of water treatment skids and package units.
Remote I/O and Distributed Field Panels: For Ovation systems utilizing remote I/O architectures, the 5A26304G02 provides the protected power distribution necessary for RRP and RRB panels located in remote field junction boxes or motor control centers. The robust fuse protection protects against field wiring faults that are more common in remote installations, while the standardized design allows sparing strategies to cover both local and remote I/O configurations with identical replacement parts.
