HA4028M12SB-Z DC 12V 0.65A Avalon 4cm Power Supply PSU Cooling Fan
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HA4028M12SB-Z DC 12V 0.65A 40x40x28mm 4cm Cooling Fan | Quiet High-Pressure Replacement for Avalon PSU Repair
The HA4028M12SB-Z is a DC 12V / 0.65A 4cm (40x40x28mm) 4-wire cooling fan built for Avalon power supply units. Designed for sustained 24/7 PSU duty: high-static-pressure airflow through the dense PFC + transformer + secondary-rectifier stack, low acoustic signature, and a 4-wire connector for PWM speed control + tach feedback to the PSU controller.
Drop-in replacement when the original PSU fan locks up, drifts in RPM, or starts ticking from worn bearings — exactly the failure modes that drive Avalon PSUs into thermal-protection shutdowns and intermittent boot loops. A fresh HA4028M12SB-Z restores rated airflow over the heat-sinked components and pushes junction temperatures back into spec.
When to Replace the HA4028M12SB-Z PSU Fan
- Avalon PSU shuts down after a few minutes — fan not spinning, secondary heat-sinks overheating into OTP.
- Audible ticking or grinding from the PSU — bearing wear; replace before the fan seizes mid-job.
- Fan running but tach reads zero on the PSU controller — broken tach wire or hall sensor in the fan.
- Visible dust-clogged blades after long outdoor or shed duty — cleaning won't restore balanced airflow; replace.
- PSU thermal-shutdown logs after hot-weather hashing — original fan no longer meets the airflow rating at high ambient.
HA4028M12SB-Z Specifications
| Parameter | Specification |
|---|---|
| Part Number | HA4028M12SB-Z |
| Category | PSU cooling fan |
| Dimensions | 40 × 40 × 28 mm (4cm) |
| Voltage | DC 12V |
| Current | 0.65A |
| Connector | 4 wires (power + GND + tach + PWM) |
| Bearing | Dual ball bearing |
| Mounting | 4× M3 through-holes, standard 40mm pattern |
| Compatibility | Avalon Power Supply Units |
| Condition | Brand New |
FAQ — HA4028M12SB-Z PSU Fan
Q: Match the original wire colours, or just power + GND?
A: Match all four. Power and GND alone will spin the fan, but the PSU controller will read zero tach and may force the rest of the unit into limp-mode or shutdown. Confirm the original pinout on a working fan with a multimeter before swapping connectors.
Q: Mount the fan blowing into the PSU or extracting?
A: Follow the OEM direction printed on the fan housing arrow. Avalon PSUs are designed for a specific airflow path through the heatsink fins — reversed orientation will not provide the static pressure the design needs and can shorten component life.
Q: Clean and reuse, or replace?
A: Cleaning helps short-term but does not restore bearing wear or balance. If the fan ticks, vibrates, or trips OTP under load, replace. PSU fans are a low-cost component compared to the PSU they protect.
Q: Bulk pricing for repair benches?
A: Yes — email contact@lys-sz.com for tray-quantity pricing on HA4028M12SB-Z stock.
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Avalon PSU repair benches stocking HA4028M12SB-Z 4cm fans by the tray? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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