Seasonic SSR-650PX PSU Review: High Performance Without Breaking The Bank

Protection Features

Protection Features

Check out our PSUs 101 article to learn more about PSU protection features. Our protection features evaluation methodology is described in detail here.

Protection Features
OCP12V: 75.6A (140%), 12.13V
5V: 27.8A (139%), 5.028V
3.3V: 27.8A (139%), 3.312V
5VSB: 6.2A (206.67%), 4.964V
OPP907.2W (139.57%)
OTP✓ (200°C @ 12V heat sinks)
SCP12V: ✓
5V: ✓
3.3V: ✓
5VSB: ✓
-12V: ✓
PWR_OKOperates properly
NLO
SIPSurge: MOV
Inrush: NTC thermistor & bypass relay

OCP triggering points on the +12V, 5V, and 3.3V rails, along with the over power-protection, are set high at around 140%. Normally we'd expect limits in the 130% range to product the platform against damage. But it appears that Seasonic is super confident in this PSU's capabilities, so it added an extra 10% headroom.

The over-temperature protection feature seems like it's set high as well. Most likely, though, the thermistor that sends data to the corresponding circuit is installed on the PCB's solder side, so the +12V heat sinks have to get exceptionally for OTP to trigger.

Finally, there is short circuit protection on all rails, and the inrush protection circuit includes a bypass relay.

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