450V 270uF Aluminum Electrolytic Capacitor 30x40mm for Power Supply Unit repair
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450V 270µF Aluminum Electrolytic Capacitor for Bitmain APW8 / APW9+ PSU Repair
This 450V 270µF aluminum electrolytic capacitor in a 30x40mm can with ±20% tolerance is the high-voltage bulk cap used on the primary side of mining PSU rectifier sections, including the Bitmain APW8 and APW9+ power supply units. It stores the rectified mains energy that feeds the PFC and main switching stages, smoothing ripple and supporting hold-up time during brief input disturbances.
Bulged, vented, leaking or low-capacitance 450V bulk caps are one of the classic failures on a tired mining PSU. A degraded bulk cap drives ripple on the DC bus, makes the PFC controller work harder, raises operating temperature and eventually trips OVP or OCP. Replacing it restores the PSU's hold-up time and removes ripple-driven downstream stress on the output stage.
Specifications
| Parameter | Value |
|---|---|
| Part type | Aluminum electrolytic capacitor (radial can) |
| Part number | 450V 270µF 30x40mm (bulk cap) |
| Condition | New |
| Capacitance | 270µF |
| Voltage rating | 450V |
| Tolerance | ±20% |
| Can size | 30mm diameter x 40mm height |
| Mounting | Through-hole, radial |
| Application | Filtering, coupling, bypass, decoupling, polarity protection |
| Use case | Mining PSU bulk-cap repair |
Where the 450V 270µF cap sits in a mining PSU
On a typical PFC-front-end PSU like APW8 or APW9+, the 450V/270µF can sits between the bridge rectifier and the PFC inductor / boost stage, storing the rectified 380-400VDC bus voltage. A weak bulk cap shows up as elevated 100/120Hz ripple on the DC bus and audible mains-frequency noise from the transformer. Always discharge the cap through a bleed resistor before unsoldering.
Compatibility
Replacement bulk cap for the 450V/270µF 30x40mm radial slot on Bitmain APW8 and APW9+ PSUs and similar mining power supplies that use the same can footprint. Confirm physical can diameter, lead pitch and silkscreen value before ordering. Pair with new bridge rectifier and PFC MOSFETs on a full PSU rebuild.
Common failure symptoms
- Bulk cap visibly bulged on top, vented or showing electrolyte residue at the base
- PSU restarts under sustained load — hold-up time has collapsed
- Elevated DC-bus ripple at 100Hz or 120Hz measured on the scope
- PFC controller running hot or shutting down on OVP / OCP
- Mains-frequency audible noise from the input filter or transformer
Frequently asked questions
Is this the bulk cap on the APW8 / APW9+?
Yes — the 450V/270µF 30x40mm radial is the standard primary-side bulk capacitor on APW8 and APW9+ PSU boards.
What's the tolerance?
±20%, consistent with the original part's class. Real measured value sits within ±20% of the 270µF nominal.
Do I need a different ESR class?
For mining PSU bulk-cap duty, match the original part's class. Lower-ESR caps from non-equivalent series can shift the PFC loop dynamics.
What other PSU repair parts do you stock?
We carry GBJ2508 / GBU3008 bridge rectifiers, 650V N-channel MOSFETs, 30A ceramic fuses and the small-value electrolytics commonly replaced alongside the 450V bulk cap.
Related products
- GBJ2508 800V 25A Bridge Rectifier for PSU Repair
- SVS47N60PN 650V N-channel MOSFET for Antminer PSU
- 30A 250V Ceramic Fuse for PSU Repair
- 25V 220µF Aluminum Electrolytic Capacitor for APW3++
Contact contact@lys-sz.com for volume pricing or compatibility questions. Worldwide shipping from our Shenzhen warehouses. DDP available for US and EU customers.
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