531X111PSHAKG1 | GE Mark V 1500W Power Supply

Description

Product Introduction

The 531X111PSHAKG1 represents the culmination of GE’s Mark V power supply development. It delivers the same 1500W capacity as the JG3, but adds hardware load-sharing for parallel operation and the longest hold-up time of any Mark V supply—100ms. This is the supply for critical turbine applications where even a 50ms power dip is unacceptable.

Compared to the 531X111PSHAKG (non-1 revision), the “G1” version adds active power factor correction (upgraded from 0.95 to >0.99), a redesigned thermal path with a modular fan cartridge, extended hold-up from 50ms to 100ms, and hardware-based load-sharing for more precise current balancing in redundant configurations. 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 advantage of the KG1 over the JG3?
The KG1 has hardware load-sharing for parallel operation—it actively balances the current between two supplies within ±3%, reducing stress on individual units. It also has a longer hold-up time (100ms vs. 90ms) and slightly lower inrush (35A vs. 36A). If you’re running redundant supplies, the KG1’s load-sharing capability ensures both units share the load evenly, extending their lifespan. The JG3 uses passive OR-ing diodes, which rely on voltage matching for load sharing—less precise.

Q: How does hardware load-sharing work?
The KG1 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 ±3%. 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 KG1 has a modular fan cartridge—if the fan fails, the Fault LED will light and the supply will derate to 50% output. The KG1’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 35A peak. Is that a concern for my branch breaker?
35A peak for 2ms is within the tolerance of most 20A C-curve breakers. If you have multiple KG1s in a panel (e.g., two supplies in parallel), the combined inrush of 70A 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 KG1.

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 KG1 in parallel.

Q: Can I run two KG1 supplies in parallel for redundancy?
Yes—the KG1 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 ±3%. 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 KG1 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 KG1?
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 60,000 hours at 40°C (about 6.8 years). The KG1’s high efficiency and load-sharing capability (which reduces stress on individual supplies) 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.

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