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Description
Application Scenarios
On a bottled-beverage filler line running S7-400 + ET200M distributed I/O across six filler carousels, the original 10 A SITOP supplying the main MCC-adjacent PLC rack began tripping on motor-start inrush from three SINAMICS G120 aux windings sharing the same 24 V bus—the 10 A unit’s Power Boost (3× = 30 A for 25 ms) was borderline for magnetically tripping the 24 V DC branch breakers when a prox-sensor short hit. The integrator swapped in the 6EP1336-3BA00-8AA0 (coated variant, because the filler wash-down cabin sees daily humidity spikes) and re-jumpered the input for 230 V AC. The 20 A unit’s 3× boost = 60 A for 25 ms now cleanly trips a 4 A DC branch breaker on a hard short, instead of the PSU itself folding back. They also dialed the output trimmer from 24.0 V up to 26.2 V to compensate ~1.8 V drop on the 30 m 24 V feeder that runs from the main MCC to carousel #4’s ET200M station—the far-end HMI and RFID heads stopped brownout-resetting during conveyor jog. Three years later the rack still runs on that same 6EP1336-3BA00-8AA0, with a second unit sitting paralleled-through-a-redundancy-module as N+1. That’s the story this PSU tells: not glamorous, but it’s the 24 V anchor that lets everything else pretend the grid is perfect.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 6EP1336-3BA00-8AA0 (base: 6EP1336-3BA00, -8AA0 = coated/spare variant) |
| Manufacturer | Siemens (SIEMENS AG) |
| Product Category | Stabilized Switching Power Supply (SITOP modular, 1-ph) |
| Input Voltage | 120/230 V AC (selectable via jumper); range 85–132 V / 176–264 V |
| Output Voltage | 24 V DC, adjustable 24–28.8 V (trimmer) |
| Rated Output Current / Power | 20 A / 480 W |
| Power Boost | 3× rated (60 A) for 25 ms — clears 24 V DC branch breakers on short |
| Efficiency | ~89% (typ.) at full load, 230 V AC input |
| Short-Circuit Behavior | Selectable: constant current (~23 A) or latching shutdown |
| Parallel Operation | Yes, up to 2 units (symmetrical load share); add SITOP redundancy module for N+1 |
| Protection Class / IP | Class I / IP20 |
| Operating Temp. | 0 … +70 °C (natural convection); –25 °C start-tested |
| Mechanical (W×H×D) | 160 × 125 × 125 mm, DIN rail (35 mm) mount, no side clearance required |
| Connections | Screw terminals: L/N/PE (0.2–4 mm²), +/– (2× each, 0.5–4 mm²), aux contacts 13/14 & 15/16 |
| MTBF (40 °C) | ~786,000 h |
| Substitute (Active) | 6EP1336-3BA10 (SITOP PSU8200, narrower housing, same 20 A / 24 V rating) |
💡 The 6EP1336-3BA00 base type is PM400 (phase-out started 2014); the 6EP1336-3BA10 is the active successor in the PSU8200 family. If you’re buying new for a panel design, spec the -3BA10 and check the narrower housing (90 mm vs. 160 mm depth) fits your rail layout. If you’re maintaining an existing -3BA00 rack, the -8AA0 coated/spare unit drops in electrically.
Technical Principles and Innovative Values
- Innovation Point 1 — 3× Power Boost Engineered for 24 V DC Branch Protection. The 6EP1336-3BA00-8AA0 delivers 60 A for 25 ms on startup/inrush and sustains a constant-current ~23 A during short events—this isn’t just “extra oomph,” it’s sized so that a downstream 24 V DC miniature circuit breaker (e.g., 4 A, magnetic trip ~40–80 A) actually sees enough let-through current to trip magnetically. Without this boost, a weak PSU can leave a faulted branch “hung”—the breaker never trips, the short stays live. The 6EP1336-3BA00-8AA0 makes the 24 V side self-protecting the same way the 230 V side is.
- Innovation Point 2 — Selectable Short-Circuit Response: Constant Current vs. Latching Shutdown. Most budget PSUs pick one behavior; the 6EP1336-3BA00-8AA0 lets you choose via internal configuration. Constant current mode clamps ~23 A, folds the voltage, and auto-recovers when the short clears—ideal for sensor/valve loops where a temporary nicked wire shouldn’t kill the whole 24 V bus. Latching shutdown kills the output completely on short and stays off until AC is cycled—use this for safety-relevant loops where a fault must force an operator response. Yellow LED = overload, red LED = latch-shutdown, green LED = 24 V OK.
- Innovation Point 3 — 24 → 28.8 V Trimmer for Cable-Drop Compensation. The output is adjustable via front pot: 24 V nominal up to 28.8 V. In wide cabinets where the PSU sits at one end and the farthest ET200M station or HMI is 30–50 m of 2.5 mm² away, the ~2–3 V drop can pull a 24 V device below its UVLO threshold during motor-start sag. Dialing the PSU to 26–27 V at the source delivers clean 24 V at the load without a DC/DC booster halfway down the run. Small knob, big panel-layout saving.
- Innovation Point 4 — Zero Side Clearance & Parallel-Ready Architecture. The 6EP1336-3BA00-8AA0 doesn’t need lateral spacing to adjacent modules (convection path is front/rear, not side), so you pack it cheek-by-jowl with a 40 A sibling or a redundancy module without derating. Two units can parallel directly (soft characteristic selectable) for 40 A shared, or—better—through a SITOP redundancy module for N+1 where one unit can fail without dropping the 24 V bus. For lines that can’t afford a 24 V hiccup, that’s the standard architecture.
- Innovation Point 5 — Protective Varnish (-8AA0 Variant Advantage). The base -3BA00 is already rugged (IP20, –25…70 °C, SEMI F47, UL 508, CE, UKCA, ABS/DNV). The -8AA0 coating adds a conformal varnish layer on the PCB that improves survival in condensing atmospheres, dusty MCC rooms, and ESD-prone assembly floors. It’s the difference between “this lived in a clean control room” and “this lived above a pulp washer.”
