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Hobart/ITW GSE 405278-007 – 40V DC Capacitor (1,150,000 µF) for GPU-400/600

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The Hobart/ITW GSE 405278-007 is a high-capacity 40V DC capacitor (1,150,000 µF) designed for use in Hobart GPU-400 and GPU-600 solid-state ground power units. Installed within the internal electrical system, this capacitor helps stabilize DC output and ensure consistent, reliable power delivery for aircraft ground support operations.

General Information
Part #405278-007
ManufacturerITW GSE/Hobart
Shipping Information
Product Weight1 lbs.
Product Dimensions8.5 x 3 x 3 in.
Schedule B8504900080
ECCNEAR99

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AIRCRAFT COMPATIBILITY

Compatible Aircraft*
*This list is for general reference only and may not be entirely accurate for all aircraft. Please confirm all equipment meets the requirements of your aircraft with the owners/maintenance manuals prior to purchasing or using with your aircraft.

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QUESTIONS & ANSWERS

Question:
What is the Hobart/ITW GSE 405278-007 capacitor used for?
Answer:

The Hobart/ITW GSE 405278-007 capacitor stores and stabilizes electrical energy in a ground power unit. It helps smooth out voltage fluctuations and supports a consistent DC output. This is critical for maintaining reliable power to aircraft systems. Proper capacitor function ensures stable GPU performance.

Asked March 24, 2026
Question:
Which equipment is compatible with the 405278-007 capacitor?
Answer:

This capacitor is compatible with Hobart GPU-400 and GPU-600 models, including Series 500160-4xx and 500082-6xx units. These are 28.5V DC solid-state transformer-rectifier ground power units. The capacitor is installed within the internal electrical components of these systems. Always confirm compatibility with your specific model.

Asked March 24, 2026
Question:
What are the specifications of the 405278-007 capacitor?
Answer:

The 405278-007 capacitor is rated at 40V DC with a capacitance of 1,150,000 microfarads (µF). It is an ALS-type capacitor designed for high-capacity energy storage. These specifications support efficient voltage smoothing in GPU systems. Proper ratings ensure safe and effective operation.

Asked March 24, 2026
Question:
Where is this capacitor installed in the GPU?
Answer:

This capacitor is installed within the GPU's internal electrical system, typically near the main power circuitry. It works alongside other components to regulate voltage output. Access usually requires opening the unit’s enclosure. Proper installation ensures optimal performance.

Asked March 24, 2026
Question:
Why is a capacitor important in a ground power unit?
Answer:

A capacitor helps maintain a steady voltage by absorbing and releasing electrical energy as needed. This reduces voltage ripple and protects sensitive aircraft systems. Stable power output is essential for safe ground operations. The capacitor plays a key role in overall electrical system performance.

Asked March 24, 2026
Question:
Is the 405278-007 a direct replacement part?
Answer:

Yes, the 405278-007 is a direct replacement capacitor that meets OEM specifications. It fits and functions like the original component without requiring modifications. This ensures reliable integration with existing systems. Direct replacement parts help maintain equipment integrity.

Asked March 24, 2026
Question:
What are the signs of a failing capacitor?
Answer:

Signs of failure may include unstable voltage output, increased electrical noise, or visible swelling or leakage. Operators may also notice inconsistent GPU performance. A failing capacitor can impact overall system reliability. Prompt replacement is recommended if issues are detected.

Asked March 24, 2026
Question:
Can this capacitor handle high-demand GPU operations?
Answer:

Yes, this capacitor is designed for high-capacity applications in aviation ground power units. Its large capacitance supports stable performance under heavy electrical loads. This makes it suitable for continuous and demanding operations. Reliable components are essential in airport environments.

Asked March 24, 2026
Question:
Is professional installation recommended for this capacitor?
Answer:

Yes, professional installation is recommended due to the electrical complexity and safety considerations. Technicians can ensure proper handling, polarity, and secure connections. This helps prevent damage to the unit or injury during installation. Proper installation ensures long-term reliability.

Asked March 24, 2026
Question:
How does the 405278-007 capacitor support aircraft ground operations?
Answer:

The capacitor ensures stable and consistent DC power output from the GPU to the aircraft. This supports critical functions such as maintenance, testing, and onboard system operation. Reliable power delivery reduces the risk of equipment issues or delays. A properly functioning capacitor is essential for efficient ground support operations.

Asked March 24, 2026