Product Core Brief
- Model: 336A4922P28V500DH
- Brand: GE (GE Vernova)
- Series: GE Speedtronic Mark VIe — DC Power Module
- Core Function: 125VDC to 28VDC power conversion module used in Mark VIe turbine control cabinets (TCP/BOP), supplying regulated 28V DC to I/O racks and control circuits.
- Product Type: DC-DC Power Supply Module
- Key Specs: Input 125V DC | Output 28V DC | Used in燃机 TCP and BOP control cabinets
- Condition: New Original (New Surplus) / Factory Sealed
Product Introduction
A Mark VIe cabinet that loses its 28V DC rail is effectively offline. The GE 336A4922P28V500DH is the DC power module historically used in GE Speedtronic Mark VIe turbine control systems to convert 125V DC station power down to 28V DC for I/O racks, terminal boards, and control circuits inside the燃机 TCP and BOP cabinets. These modules have been documented as aging field components with rising failure rates — single module failures have caused cabinet power loss and unit trips in combined-cycle plants.
Why this matters: when one of these power modules fails, the I/O it feeds goes dark. Thermocouples, valve positioners, pressure transmitters — all lose power simultaneously. For plants still running legacy Mark VIe installations with this module, a verified spare on the shelf means you swap it during a planned outage instead of scrambling after an unexpected trip. These are discontinued parts and getting harder to source clean.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 336A4922P28V500DH |
| Product Type | DC-DC Power Supply Module |
| Compatible Platform | GE Speedtronic Mark VIe Turbine Control System |
| Input Voltage | 125V DC (station battery) |
| Output Voltage | 28V DC |
| Typical Installation | 燃机 TCP cabinet, BOP control cabinet (3 modules per cabinet in documented configurations) |
| Application | I/O rack power, control circuit distribution |
| Mounting | DIN rail / cabinet panel mount |
Note: Exact current rating, efficiency, and connector pinout are not publicly documented in open sources. Confirm against your existing module’s label and the GE Mark VIe hardware manual before ordering.
Key Selling Points & Differentiators
- Correct part for documented Mark VIe installations. This part number has been explicitly identified in field upgrade documentation as the original 125VDC-to-28VDC module used in Mark VIe TCP and BOP cabinets.
- Direct replacement for aging field stock. Plants running legacy Mark VIe systems with these modules installed can use this as a like-for-like spare without re-engineering the cabinet.
- New surplus availability. These are discontinued GE parts. We stock verified, unused units — not pulled modules with unknown thermal cycling history.
- Not recommended for Mark V (DS200-series power boards), Mark VI (IS200-series power cards), or non-GE turbine control platforms. Wrong platform = different voltage, connector, and mounting.
- 12-month warranty with pre-shipment visual inspection and output voltage verification under load.
Quality Transparency SOP
- Label & part-number audit. Verify “336A4922P28V500DH” on the nameplate. Cross-check against known GE power module labeling formats to rule out relabeled substitutes.
- Visual inspection. Check for burnt components, swollen capacitors, cracked solder joints, or corrosion — especially around input/output terminals and heatsink areas.
- Connector pin check. Verify all power terminals and signal pins are straight, clean, and undamaged. Loose or corroded terminals cause intermittent voltage drops.
- Output voltage test. Apply rated 125V DC input. Measure 28V DC output under load with a Fluke multimeter. Confirm voltage stays within ±5% tolerance.
- ESD packaging. Sealed in anti-static bag, foam-padded box, shipped with a signed test report.
Technical Risk Avoidance
- ❗ Verify input voltage before wiring. This module expects 125V DC input. Connecting it to 220V AC or 48V DC will destroy the unit instantly. Confirm your cabinet’s actual station battery voltage matches the module rating.
- ❗ Check for documented upgrade paths. Some plants have replaced this module with newer DC power supplies or added DACA AC/DC backup converters during Mark VIe upgrades. If your cabinet has already been upgraded, this legacy module may no longer be the correct spare.
- ❗ Test output voltage under load before installing. A module that reads 28V DC at no load may sag under actual I/O rack current. Always verify under representative load conditions.
- ❗ Document cabinet wiring before swapping. TCP and BOP cabinets typically have multiple power modules feeding different I/O sections. Removing the wrong module can de-energize live channels. Verify which I/O rack each module feeds before pulling it.
- ❗ Consider redundancy. Documented field experience shows single-module failures causing cabinet-wide power loss. If your cabinet lacks redundant power feeds, evaluate adding a backup converter during the replacement window.
Buyer’s FAQ
Q: What system is this module used in? A: The 336A4922P28V500DH is a DC power module used in GE Speedtronic Mark VIe turbine control systems, specifically documented in燃机 TCP and BOP control cabinets.
Q: Is this compatible with Mark V or Mark VI systems? A: No. Mark V systems use DS200-series power boards. Mark VI systems use IS200-series power cards. This part number is specific to Mark VIe installations.
Q: Is this new or refurbished? A: New original surplus — factory sealed, never installed. We do not sell pulled or refurbished modules as “new.”
Q: What’s the output current rating? A: The exact current rating is not publicly documented in open sources. Confirm against your existing module’s label or the GE Mark VIe hardware manual before ordering.
Q: What’s the lead time and warranty? A: In-stock units ship within 1–2 business days. 12-month warranty from ship date, covering manufacturing defects and DOA failures.
