Quick Answer
High voltage capacitors store lethal electrical energy long after unplugging. Never open power supply enclosures. The safest approach requires disconnecting mains power and waiting for bleeder circuits to drain charge. Leave physical discharging, terminal probing, and internal repairs exclusively to the equipment manufacturer or certified technicians with proper safety gear.
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Cons
- Listing gives no benchmark or real-world performance data
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Pros
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Cons
- No benchmark, power draw, or connector details listed
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Cons
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Why Power Supply Capacitors Are Dangerous
A modern ATX power supply unit (PSU) rectifies mains AC and stores it in a primary-side bulk electrolytic capacitor. On 120 VAC service, the rectified peak is roughly 170 V. On 230 VAC service it is roughly 325 V. Active power factor correction (PFC) boosts this to a regulated DC bus of approximately 380-400 V. For that reason, bulk capacitors are almost universally rated at 400 V or 450 V and operate close to their rated voltage during normal use.
The hazard is a function of stored energy, not of the unit being plugged in. Stored energy follows E = ½CV². Typical bulk capacitance runs from 220 µF in entry-level 350 W units to 680 µF or more in high-wattage platinum and titanium designs. At a 400 V bus, the stored energy is:
- 220 µF at 400 V: ≈ 17.6 J
- 470 µF at 400 V: ≈ 37.6 J
- 680 µF at 400 V: ≈ 54.4 J
For comparison, a defibrillator delivers energy in the 150-360 J range. A 30-50 J pulse delivered across the chest is therefore a serious cardiac and burn hazard. Engineering evaluations of electrical injury indicate that current, not voltage, determines physiological effect. With a body resistance of about 1,000 Ω across a hand-to-hand path, a 400 V source can briefly drive a peak current near 0.4 A. This is far above the 50-100 mA range associated with ventricular fibrillation at power frequencies. Capacitor discharge is a unidirectional pulse, but the energy and peak current involved remain hazardous.
