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Here are available replacement and compatible parts for AT-30-3.
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300 watt Replacement AT Power supply
Compatible only with AT motherboards
Dimension: 140mm x 150mm x 86mm / 5.9"x5.5"x3.4" Inch
Transient Response: +5V, +12V output return to within 5% in less than 1ms for 20% loads change.
P.G. Signal: 100-500ms
Over Voltage Protection
Recycle AC to reset: +5V trip point < +6.9V
Overload Protection: Output equipped w/ short circuit protection
Leakage Current: < 3.6mA @ 240VAC
Input Voltage: 115 VAC/230VAC
Input Frequency Range: 47Hz to 63Hz
Input Surge Current (p-p): < 45A @ 115 VAC Cold Start
Input Current: 7.0A for 115 VAC / 4.0A for 230 VAC
Hold-up Time: < 16 ms at Full Load
Efficiency: > 70%
EMI/RFI: FCC Class B
This power unit has (2) AT 6 pin motherboard connectors, (6) peripheral power connectors, and (2) floppy drive connectors.