30A 250V Ceramic Fuse for Crypto Miner Power Supply Unit repair
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30A 250V Ceramic Fuse for Crypto Miner PSU Repair
This 30A 250V ceramic fuse is the standard mains-input protection part used on ASIC mining power supplies. Built around a ceramic body with nickel-plated brass end caps, it delivers a higher breaking rating and superior temperature resistance versus glass fuses, which is critical when the upstream fault current can be very high on a 220-277V mining circuit.
The double cap holds a 3C certification, ensuring both performance and compliance for cross-border deployments. Replace any visibly opened, sooted or burnt fuse with a like-for-like part — never bypass it.
Specifications
| Parameter | Value |
|---|---|
| Product type | Ceramic fuse (leaded) |
| Condition | New |
| Current rating | 30A |
| Voltage rating | 250V |
| End cap material | Nickel-plated brass |
| Body | Ceramic |
| Double cap certification | 3C |
| Breaking rating | Higher than glass fuses |
| Temperature resistance | Superior to glass fuses |
| Application | Crypto miner PSU input protection, electrical appliances, instruments |
Where the 30A 250V fuse sits in a PSU
Inside an ASIC miner PSU, the 30A 250V ceramic fuse sits on the AC input, immediately after the inlet connector and before the bridge rectifier. Its job is to interrupt the circuit if a downstream short blows past the upstream breaker. A blown fuse is therefore both an isolation device and a fault signature — never replace the fuse without investigating the root cause first.
Compatibility
Replacement fuse for ASIC miner PSUs and similar electrical appliances using a 30A/250V ceramic fuse in the AC input position. Verify the body length and cap diameter match your existing fuse before fitting. Always match the original speed (fast / time-delay) as marked on the PSU PCB or schematic.
Common failure symptoms
- PSU completely dead — no fan spin, no standby LED, no high-voltage bus
- Fuse body visibly opened, charred or with sooted end caps
- Continuous click at AC connect, miner never powers on
- Bridge rectifier or PFC MOSFET shorted, dragging the fuse with it
- Repeat fuse blow after replacement — fault still present upstream
Frequently asked questions
Can I replace a glass fuse with this ceramic one?
Only if the body length, cap diameter, current rating, voltage rating and speed match the original. Ceramic fuses give a higher breaking rating but the format must still match the holder.
Why did my fuse blow?
Almost always there is a downstream fault — usually a shorted PFC MOSFET, bridge rectifier or bulk capacitor. Investigate before fitting a new fuse, otherwise the new one will also fail.
What does "3C certification" mean here?
3C is the China Compulsory Certification covering safety performance and material compliance. The double cap holds this certification on this fuse line.
Do you stock matching bridge rectifiers and MOSFETs?
Yes — see GBJ2508, GBU3008 bridge rectifiers and NCE65TF130D, SVS47N60PN power MOSFETs in related products.
Related products
- GBJ2508 800V 25A Bridge Rectifier
- GBU3008 800V 30A Bridge Rectifier
- NCE65TF130D 650V 28A Super-Junction MOSFET
- SVS47N60PN N-channel MOSFET for Antminer PSU
Contact contact@lys-sz.com for volume pricing or compatibility questions.
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