531X111PSHAKG3 | GE Surplus – Ready to Ship

Description

Product Introduction

The 531X111PSHAKG3 represents the apex of GE’s Mark V power supply development—the highest specification, most reliable 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 in the Mark V family. For critical turbine applications where power continuity is paramount, this is the supply you install.

Compared to the 531X111PSHAKG2, the “G3” revision brings the final set of improvements: the input filter was redesigned for improved EMI/EMC performance, the hold-up time was extended from 110ms to 120ms, and the fan cartridge now features dual ball-bearing fans for extended life. The thermal management was also refined with a larger heatsink for lower operating temperatures. 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 KG3 over the KG2?
The KG3 has a redesigned input filter for improved EMI/EMC performance—critical if your rack shares a power bus with sensitive instrumentation. The hold-up time increased to 120ms (vs. 110ms), giving your UPS an additional 10ms to transfer. The inrush current was reduced from 33A to 32A, placing less stress on upstream breakers. The fan cartridge now uses dual ball-bearing fans for extended life (rated for 80,000 hours vs. 70,000 hours). The ripple and noise was reduced from <80mV to <75mV, which benefits sensitive analog circuits.

Q: How does hardware load-sharing work on the KG3?
The KG3 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%. To use load-sharing, connect the load-share terminals together between the two supplies. 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 KG3 has a modular fan cartridge—if the fan fails, the Fault LED will light and the supply will derate to 50% output. The KG3’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 32A peak. Is that a concern for my branch breaker?
32A peak for 2ms is within the tolerance of most 20A C-curve breakers. If you have multiple KG3s in a panel (e.g., two supplies in parallel), the combined inrush of 64A may trip a 30A breaker on startup. Use D-curve breakers or sequence the power-up of the supplies by stagerring the AC feeds. We recommend dedicated 30A branch circuits for each KG3.

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. If you’re consistently seeing amber, add a second KG3 in parallel.

Q: Can I run two KG3 supplies in parallel for redundancy?
Yes—the KG3 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 KG3 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. If you have redundant supplies, you can pull one—but only if the OR-ing diodes are present. 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 KG3?
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 with dual ball-bearing fans is rated for 80,000 hours at 40°C (about 9.1 years). The KG3’s high efficiency and load-sharing capability extend 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.

A-B MVI56-PDPMV1
A-B 1756-L71
A-B 1336S-B007-AE-EN
HIMA F3 AIO 8/4 01