Siemens 6EP1336-3BA00-8AA0 Power Supply – SITOP PSU200M

Siemens 6EP1336-3BA00-8AA0 — 24 VDC / 20 A SITOP PSU200M: Regulated DC Power Infrastructure for Industrial Control Systems

The 6EP1336-3BA00-8AA0 is a single-phase, wide-range switched-mode power supply within Siemens’ SITOP PSU200M platform. Rated at 24 VDC / 20 A (480 W continuous), it functions as the primary DC bus source for SIMATIC S7 control cabinets, ET 200 distributed I/O stations, SINAMICS drive auxiliary circuits, and safety relay networks. Its role in the control loop is foundational: it converts unstable grid AC into a tightly regulated, low-ripple 24 VDC rail that every downstream module — CPU, signal module, field device — depends on for deterministic operation. Voltage deviation on this rail directly translates to timing jitter, false diagnostics, and in worst cases, uncontrolled process shutdowns. The PSU200M architecture is designed to eliminate that risk.

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Technical Parameters

Hardware Logical Analysis

The 6EP1336-3BA00-8AA0 implements a two-stage power conversion architecture. The first stage is an active power factor correction (PFC) boost converter operating at approximately 65–100 kHz, which raises the rectified AC input to a stable 400 VDC intermediate bus while maintaining input current sinusoidal — achieving a power factor ≥ 0.99. This eliminates reactive current loading on the facility transformer and reduces harmonic distortion to levels compliant with IEC 61000-3-2 Class A.

The second stage is a phase-shifted full-bridge DC-DC converter with synchronous rectification on the secondary side. The high switching frequency (typically 100–150 kHz) allows the use of compact magnetics while achieving the < 50 mV ripple specification. Output voltage regulation is handled by a dedicated PWM controller IC with optocoupler-isolated feedback, ensuring galvanic isolation between the AC input and the 24 VDC output rail — a mandatory requirement for SELV (Safety Extra-Low Voltage) classification under EN 60950-1 / IEC 62368-1.

EMC performance is addressed at three levels: (1) a common-mode choke and X/Y capacitor network on the AC input suppresses conducted emissions per EN 55011 Class B; (2) the high-frequency transformer uses a split-bobbin construction with a Faraday shield between primary and secondary windings, attenuating capacitively coupled noise; (3) the output stage includes a differential-mode LC filter that reduces switching ripple before it reaches the output terminals. The result is a noise floor compatible with sensitive analog instrumentation and 4–20 mA transmitter loops sharing the same 24 V rail.

The DC OK supervisory circuit monitors output voltage via a precision voltage divider. When output voltage falls below approximately 21 V or rises above 27.5 V, the relay de-energizes within < 10 ms, providing a fast fault signal to the connected PLC digital input. This latency is short enough to allow the PLC program to execute a controlled shutdown sequence before the hold-up capacitors are depleted — a critical feature for processes where an uncontrolled stop causes mechanical damage or product loss.

Parallel operation is enabled by an internal active current-sharing circuit. When two or more PSU200M units are connected output-to-output, the sharing bus equalizes load current between units to within ±5 % of rated current, preventing thermal runaway in any single unit. Internal reverse-current blocking eliminates the need for external Schottky ORing diodes, reducing BOM cost and cabinet wiring complexity.

System Integration Benefits

• Deterministic voltage regulation: Output voltage deviation is held within ±1 % under load transients from 10 % to 100 % rated current, preventing false triggering of undervoltage lockout circuits in connected SIMATIC CPUs and I/O modules.
• Universal AC input eliminates regional variants: The 85–264 VAC wide-range input covers 100 V (Japan), 120 V (North America), 230 V (Europe/Asia), and 240 V (Australia/UK) grids from a single SKU, simplifying global machine builder procurement and spare-parts inventory.
• Active PFC reduces infrastructure cost: Power factor ≥ 0.99 means the facility UPS and distribution transformer are sized to actual watts consumed, not apparent VA — typically reducing transformer sizing by 15–20 % in multi-PSU installations.
• 20 ms hold-up bridges micro-interruptions: Covers the typical 10–16 ms AC mains dip caused by motor starting or grid switching events, maintaining continuous 24 VDC output without process interruption or PLC restart.
• DC OK relay enables PLC-level power diagnostics: The floating relay contact connects directly to a standard PLC DI terminal. The PLC program can log power fault events with millisecond timestamps, enabling root-cause analysis of intermittent shutdowns without additional monitoring hardware.
• N+1 redundancy without external hardware: Parallel-capable architecture allows a second PSU200M to be added for hot-standby redundancy. If one unit fails, the second assumes full load within one switching cycle (< 10 µs), with no interruption to the 24 VDC bus.
• ATEX Zone 2 approval extends deployment scope: Ex nA IIC T4 Gc certification permits installation in areas where explosive gas atmospheres may occur occasionally, covering chemical processing, oil & gas wellhead control, and pharmaceutical cleanroom panels without requiring a separate Ex-rated enclosure for the PSU.
• Compact 60 mm DIN-rail footprint: At 60 mm wide, the unit occupies the same rail space as a standard 4-pole circuit breaker, allowing high-density cabinet layouts. A 400 mm DIN rail can accommodate up to six PSU200M units in parallel for 120 A aggregate output — sufficient for large ET 200M or ET 200SP station clusters.
• Output voltage trim for cable compensation: The ±10 % trim potentiometer allows field adjustment to 26.4 V nominal, compensating for voltage drop across long 24 VDC distribution cables (e.g., 50 m of 2.5 mm² cable at 20 A drops approximately 1.7 V), ensuring remote field devices receive ≥ 24 V at their terminals.

Quality Assurance & Global Logistics

Every 6EP1336-3BA00-8AA0 unit supplied by siemensplc.com is sourced through verified Siemens-authorized distribution channels and undergoes a structured incoming inspection protocol before dispatch. Inspection steps include: label and date-code verification against Siemens OEM records; housing and connector condition assessment; power-on functional test measuring output voltage, ripple, and DC OK relay actuation; and load test at 50 % and 100 % rated current with thermal imaging to confirm no abnormal hotspots on the PCB. Units that do not pass all checkpoints are quarantined and not offered for sale.

Counterfeit screening is applied to every batch: PCB silkscreen markings, transformer winding color codes, and unit weight (±50 g tolerance against OEM specification of 2,200 g) are cross-referenced. Any discrepancy triggers rejection of the entire batch.

Logistics are managed from our warehouse in Xiamen, China — a major international freight hub with direct access to DHL Express, FedEx International Priority, and UPS Worldwide Expedited services. Standard transit times: 3–5 business days to Europe and North America via express courier; 5–8 business days to Southeast Asia and the Middle East. Sea freight consolidation is available for orders exceeding 50 kg. All shipments include commercial invoice, packing list, and certificate of conformity. Export documentation for ATEX-rated units includes the EU Declaration of Conformity. A 12-month warranty covers all verified genuine units, with DOA (Dead on Arrival) replacement dispatched within 7 business days of confirmed fault report.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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