Siemens 6EP1336-3BA00 Industrial Power Supply

Siemens 6EP1336-3BA00 — Stop the Clock on Your Downtime. Ship Today.

Every minute your line is down, you’re bleeding money. A failed 24 VDC power rail doesn’t wait for procurement cycles. The Siemens 6EP1336-3BA00 SITOP Modular 10 A unit is on our shelf in Xiamen right now — tested, boxed, and ready to move via DHL or FedEx within hours of your order confirmation. We’ve handled enough emergency callouts to know that the difference between a 4-hour fix and a 3-day nightmare is whether your supplier picks up the phone and has stock. We do both.

URGENT REQUIREMENT? Contact: [email protected] | WhatsApp: +86 18359268345

Quick Technical Datasheet

Troubleshooting & Replacement Tips

Swapping a 6EP1336-3BA00 in the field is straightforward if you know what to watch for. Here’s what ten years of panel callouts have taught us:

1. Confirm the fault is actually the PSU, not the load. Before pulling the unit, measure the 24 VDC bus under load. If voltage collapses below 21 V or the DC OK relay drops out intermittently, the PSU is the prime suspect. If voltage is stable but a downstream device is dead, check your SITOP selectivity module first — a tripped channel looks identical to a failed supply from the PLC’s perspective.

2. Output voltage trimmer position. The 6EP1336-3BA00 ships with the trimmer centered at 24.0 V. If your old unit was adjusted (common in long cable-run installations), note the trimmer position before removal. A mismatch of even 0.5 V can cause 24 V sensors to report out-of-range or trip SIL-rated safety relays. Use a calibrated multimeter on the output terminals before releasing the panel back to production.

3. Parallel redundancy wiring. If you’re running two units in parallel for N+1 redundancy, both units must be set to identical output voltages (within ±0.1 V). A voltage mismatch causes one unit to carry the full load while the other idles — defeating the redundancy and accelerating wear on the loaded unit. Use the SITOP bus connector 6EP1961-3BA11 for clean current sharing.

4. DC OK relay integration. The floating relay contact (terminals 11/12) must be wired to a PLC digital input for proper fault annunciation. If your replacement unit’s DC OK signal is not appearing in the PLC, check the relay polarity — it’s a normally-open contact that closes when output is healthy. Wiring it as normally-closed will invert the logic and generate a permanent fault alarm.

5. Inrush current on cold start. The 6EP1336-3BA00 draws up to 20 A inrush at 230 VAC on cold start. If your upstream MCB trips on power-up after replacement, switch to a Type B or Type C characteristic breaker rated at ≥ 16 A. A Type A breaker is too sensitive for this PSU’s inrush profile.

6. ATEX Zone 2 installations. If this unit is installed in a Zone 2 hazardous area, verify the enclosure maintains IP54 minimum and ambient temperature does not exceed 55 °C. The ATEX certification (II 3 G Ex nA IIC T4 Gc) is valid only within these constraints. Post-replacement, re-seal all cable glands before energizing.

Common fault codes on SIMATIC S7 systems after PSU failure:

• SF/BF LED on CPU — Loss of 24 VDC supply causes CPU to enter STOP mode; after PSU replacement, perform a manual RESTART from STEP 7 / TIA Portal.
• DP/PN bus dropout — PROFIBUS/PROFINET slaves lose power simultaneously; check that all slaves have recovered and re-establish communication in the network diagnostics view.
• ET 200 station fault — Distributed I/O stations may require a cold restart after power restoration; cycle the station power or use the TIA Portal online diagnostics to force a re-initialization.

Reliability in Harsh Conditions

The SITOP Modular platform was not designed for climate-controlled server rooms. It was built for the kind of environments where engineers wear hard hats and the ambient temperature swings 40 degrees between morning startup and afternoon peak production. The 6EP1336-3BA00 operates continuously from -25 °C to +60 °C without derating — and up to +70 °C with a linear current reduction to 6 A. That covers everything from outdoor switchgear cabinets in northern winters to foundry control panels running next to induction furnaces.

Vibration resistance meets IEC 60068-2-6 (sinusoidal, 5–150 Hz, 1 g) and IEC 60068-2-27 (shock, 15 g / 11 ms half-sine). In practice, this means the unit survives being mounted on a press frame or a conveyor drive panel without capacitor fatigue or connector fretting. The conformal-coated PCB assembly resists humidity up to 95% RH non-condensing, making it suitable for food processing and coastal installations where condensation is a recurring problem.

The LLC resonant converter topology eliminates the hard-switching losses that degrade electrolytic capacitors in conventional PSUs. Combined with an MTBF exceeding 500,000 hours at 40 °C full load, this translates to a statistically expected service life well beyond a decade of continuous operation — which is why you’ll find 6EP1336-3BA00 units still running in panels commissioned in the early 2010s. When one finally fails, it’s usually a capacitor at end-of-life, not a catastrophic failure, and the DC OK relay gives you advance warning before the output collapses completely.

Global Express Logistics

Our warehouse is located in Xiamen, Fujian — one of China’s primary export hubs with direct access to DHL, FedEx, and UPS international gateways. For urgent industrial replacement orders, we operate on the following dispatch timeline:

• Order confirmed before 14:00 CST — Same-day dispatch via DHL Express or FedEx International Priority
• Order confirmed after 14:00 CST — Next business day dispatch, with tracking number issued within 2 hours of pickup
• Transit times: Southeast Asia 1–2 days | Europe 3–5 days | North America 3–5 days | Middle East 4–6 days | Australia 3–4 days
• Documentation: Commercial invoice, packing list, and certificate of origin issued with every shipment. HS code 8504.40 declared for customs clearance. ATEX documentation available on request.
• Customs: We handle export customs clearance from China. Import duties and VAT are the buyer’s responsibility. We can provide a proforma invoice for import pre-clearance if required.
• Insurance: Full cargo insurance available on request for orders above USD 500. Declare at checkout or contact us before dispatch.

If your plant is down and every hour counts, send us a WhatsApp message with your shipping address and we will confirm stock availability and a firm dispatch time within 30 minutes during business hours.

Contact Information

📧 Email: [email protected]
💬 WhatsApp: +86 18359268345
🌐 Web: siemensplc.com
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