After the breaker trips, what does your PDU tell you?
A circuit breaker trips at 2am. Your PDU sends an alert: load exceeded threshold. No outlet ID. No waveform. No indication of whether the problem is still live. You start a manual audit.
The Raritan PX4 changes what happens next.
Incident Recovery: Basic PDU vs Raritan PX4
What happens after a circuit breaker trip
Basic PDU — 2 to 4 hours
!
Breaker trips
→
?
Alert: load exceeded
→
🔍
Manual audit outlet by outlet
→
2-4h
Root cause identified
Raritan PX4 — under 5 minutes
!
Breaker trips
→
📊
Outlet ID + waveform captured
→
🔒
Offending outlet isolated (TCOH)
→
✓
Others restored in <5 min
Outlet-Level Visibility — Rack A, PDU-01
R/G/B LED indicators show real-time outlet health at a glance
Raritan PX4 | PDU-01 | 32A / 230V
ONLINE
A
U01
360W
U02
290W
U03
TRIP
U04
170W
U05
380W
U06
210W
U07
145W
U08
90W
Normal
Warning (>75% threshold)
Trip cause identified
Total Harmonic Distortion — What the PX4 Detects
Continuous measurement at inlet and outlet level — no external analyser required
Normal Supply
Pure sine wave — THD <5%
Harmonic Distortion
3rd + 5th harmonics detected — equipment at risk
Harmonics from servers and switching PSUs cause overheating, premature component failure, and unexplained load imbalances. The PX4 measures current and voltage THD in real time at every outlet — replacing the need for a periodic harmonic study.
Inrush Current — Why Breakers Trip During Maintenance
Measured per outlet at power-on — the PX4 captures what steady-state monitoring misses
At power-on, a device can draw 5–10x its rated current for the first 20–50ms. Power on enough devices simultaneously and that cumulative inrush trips the breaker — even if total steady-state load is within limits. The PX4 measures inrush per outlet so you can sequence power-ons safely.
PX4 vs Basic PDU — At a Glance
Measured at outlet level in real time
Capability
Basic PDU
Raritan PX4
Total load (RMS)
✓
✓
Outlet-level wattage
✗
✓
Circuit breaker trip forensics
✗
✓
Waveform capture at event
✗
✓
Total harmonic distortion (THD)
✗
✓
Inrush current per outlet
✗
✓
Reactive power, crest factor, displacement PF
✗
✓
A basic PDU tells you a breaker tripped. The PX4 tells you which device caused it, what the waveform looked like, and lets you restore power to everything else while that device stays isolated.
