531X111PSHAKG2 | GE Factory Tested & ISO Certified

Description

Product Introduction

The 531X111PSHAKG2 is the final evolution of GE’s Mark V power supply platform—the highest-capacity, most feature-rich supply ever produced for the Mark V system. It delivers 1500W with hardware load-sharing, a modular fan cartridge, and the longest hold-up time of any Mark V supply. This is the supply for the most demanding critical turbine applications.

Compared to the 531X111PSHAKG1, the “G2” revision brings targeted improvements: efficiency was bumped from 95% to 96% at full load, hold-up time was extended from 100ms to 110ms, and the inrush current was reduced from 35A to 33A. The fan cartridge was also redesigned with improved bearings for longer life. The terminal assignment is identical—direct drop-in. No firmware changes required.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the main improvement in the KG2 over the KG1?
The KG2 has improved efficiency (96% vs. 95%), reducing heat generation by about 15W at full load. The hold-up time increased to 110ms (vs. 100ms), giving your UPS more time to transfer. The inrush current was reduced from 35A to 33A, placing less stress on upstream breakers. The load-sharing accuracy was improved from ±3% to ±2%, ensuring even better current balance between parallel units. The fan cartridge also features improved bearings for longer life.

Q: How does hardware load-sharing work on the KG2?
The KG2 has a load-share bus (a dedicated signal line between parallel units). The two supplies communicate their output current and adjust their voltage references to balance the load within ±2%. This prevents one supply from carrying 80% of the load while the other carries 20%—a common issue with passive OR-ing diode configurations. To use load-sharing, connect the load-share terminals together between the two supplies (in addition to the DC outputs). The blue “Load Share Active” LED lights when the system is balanced.

Q: The Fault LED is red, but the DC OK LED is green. What’s happening?
Green DC OK means the 24V output is within spec. Red Fault indicates an internal warning—typically overtemperature (fan failure or blocked airflow) or an input voltage out of range (below 180VAC or above 265VAC). The KG2 has a modular fan cartridge—if the fan fails, the Fault LED will light and the supply will derate to 50% output. The KG2’s thermal sensor triggers the fault at 80°C—if the temperature reaches 85°C, the supply will shut down.

Q: The inrush current is 33A peak. Is that a concern for my branch breaker?
33A peak for 2ms is within the tolerance of most 20A C-curve breakers. If you have multiple KG2s in a panel (e.g., two supplies in parallel), the combined inrush of 66A may trip a 30A breaker on startup. Use D-curve breakers (which tolerate higher inrush) or sequence the power-up of the supplies by stagerring the AC feeds. We recommend dedicated 30A branch circuits for each KG2.

Q: The Overload LED is amber. What does that mean?
Amber Overload LED indicates the supply is drawing more than its continuous rating (62.5A). At loads between 62.5A and 75A, it’ll light amber and continue running—but the output voltage may droop (down to 22V). If the load exceeds 75A, the supply enters foldback current limiting (output drops to about 12V, and the LED flashes). Check your rack’s total load with a clamp meter on the backplane’s 24V line. If you’re consistently seeing amber, consider adding a second KG2 in parallel.

Q: Can I run two KG2 supplies in parallel for redundancy?
Yes—the KG2 has both OR-ing diodes and hardware load-sharing. Connect the DC outputs together (+24V to +24V, 0V to 0V), connect the load-share signal terminals together, and feed the AC inputs from separate breakers. The supplies will share the load within ±2%. If one fails, the other takes the full load. The blue “Load Share Active” LED will light when both supplies are contributing and balanced.

Q: Can I hot-swap the KG2 while the rack is powered?
The board supports hot-swapping when used in a redundant configuration (two supplies in parallel). In a single-supply configuration, pulling the supply will immediately shut down the entire rack—a guaranteed turbine trip. If you have redundant supplies, you can pull one—but only if the OR-ing diodes are present (they’re internal to the KG2). Verify the DC outputs are connected together before attempting. When you insert a new supply, the load-sharing circuit will re-balance the current within a few seconds.

Q: What’s the expected lifespan of the KG2?
The electrolytic capacitors are rated for 12,000 hours at 85°C. In a 40°C cabinet, the lifespan extends to about 18-22 years. The modular fan cartridge is rated for 70,000 hours at 40°C (about 8 years) due to the improved bearings. The KG2’s high efficiency (96%) and load-sharing capability help extend the lifespan. Replace the fan cartridge every 5-7 years proactively.

Q: What’s the lead time for a surplus unit?
We keep 2-3 units in stock. Domestic: 2-3 business days ground, overnight if ordered by 2 PM EST. International: 5-7 days via DHL, with customs potentially adding 1-3 days. This board is not ITAR-controlled, so we can ship to most countries without an export license. We include a GE certificate of origin and commercial invoice with every shipment. Contact us if you need expedited shipping for a critical outage.

VISATRON VN115/87-EMC
PROFACE/ 2880045-01
SCHNEIDER TSXP574634M
A-B 1756-L71