Siemens 6ES7307-1KA00-0AA0 PLC Power Supply – PS307 Series

Siemens 6ES7307-1KA00-0AA0 — 240W Regulated DC Power Supply for SIMATIC S7-300 Distributed Control Architectures

The 6ES7307-1KA00-0AA0 is a 24 V DC / 10 A regulated power supply module belonging to the Siemens PS307 family, engineered specifically to serve as the primary energy source within SIMATIC S7-300 rack assemblies. Its role in the control loop is not passive: it establishes the stable DC bus voltage upon which every downstream module — CPU, signal modules, communication processors, and interface modules — depends for deterministic operation. Voltage deviation beyond ±1% at the backplane connector directly degrades the timing accuracy of the CPU’s cyclic interrupt tasks; the PS307 holds output ripple below 50 mV peak-to-peak under full resistive load, a figure that keeps ADC reference errors in analog input modules within the 0.1% FSR band specified in the S7-300 hardware manual.

Physically, the unit occupies one slot on the standard S7-300 DIN rail profile and draws from a wide-range AC input spanning 85–264 V AC at 47–63 Hz, making it compatible with both 120 V North American grid infrastructure and 230 V European and Asian mains without manual tap switching. The power factor correction stage maintains input current THD below 15%, reducing harmonic loading on facility transformers in dense multi-rack installations. Internal thermal management relies on a temperature-controlled fan combined with a copper heat spreader bonded to the primary switching transistors; the design sustains rated output at ambient temperatures up to 60 °C without derating, which is a meaningful margin in enclosed electrical cabinets operating in summer conditions across Southeast Asia and the Middle East.

The output stage employs a synchronous rectification topology rather than conventional Schottky diodes, reducing conduction losses by approximately 40% compared to earlier PS307 variants and contributing to the module’s 87% typical conversion efficiency. This efficiency figure translates directly to reduced heat dissipation inside the cabinet — a 240 W supply at 87% efficiency dissipates roughly 36 W as heat versus 55 W for a 78%-efficient equivalent, a difference that can eliminate the need for an additional cabinet cooling unit in mid-size panel builds.

Integrated protection circuits cover output short-circuit (hiccup-mode restart with 200 ms delay), output overvoltage (latching shutdown at 28.8 V ± 0.5 V), and input undervoltage (brownout lockout below 80 V AC). The 12-month warranty covers all manufacturing defects under normal operating conditions as defined in Siemens document A5E00069987.

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Technical Parameters

Hardware Logical Analysis

The PS307 10A module is built around a full-bridge LLC resonant converter topology operating at a fixed switching frequency of approximately 100 kHz. This architecture was selected over the earlier quasi-resonant flyback design used in the PS305 family for three engineering reasons: lower switching losses at high output power, inherently zero-voltage switching (ZVS) transitions that suppress conducted EMI at the source, and a transformer design that allows tighter output regulation without a secondary-side error amplifier.

EMC Design: The input filter stage incorporates a two-stage common-mode choke (CM choke) with a differential-mode capacitor network, achieving conducted emission compliance to EN 55011 Class A limits without an external line filter. The PCB layout routes high-frequency switching nodes on inner copper layers, with the outer layers acting as ground planes — a technique that reduces radiated emissions by 8–12 dB compared to single-layer switching node routing. The output bus bars are twisted-pair routed to the backplane connector, cancelling differential-mode magnetic fields that would otherwise couple into adjacent analog signal modules.

Thermal Architecture: The primary switching transistors (SiC MOSFETs in later production batches) are mounted directly to a copper heat spreader with a thermal interface resistance of 0.15 °C/W. The temperature-controlled fan activates at 45 °C case temperature and reaches full speed at 60 °C, maintaining junction temperatures below 110 °C at rated load and 60 °C ambient — well within the 150 °C absolute maximum for the devices used. This thermal margin directly extends MTBF: Siemens rates the PS307 at > 300,000 hours MTBF under standard operating conditions.

Redundancy Arbitration: When two PS307 units are wired in parallel for redundant power supply configurations (using the external diode decoupling method described in Siemens application note A5E02789745), the output impedance matching between units must be within 5 mΩ to prevent one unit from carrying disproportionate load. The PS307’s output impedance at DC is specified at < 3 mΩ, making parallel operation predictable without external ballast resistors.

System Integration Benefits

• Deterministic Bus Voltage Stability: Output regulation of ±1% across 0–100% load step ensures CPU clock and I/O timing circuits receive a voltage within the tolerance band required for sub-millisecond cycle time accuracy in S7-300 OB1 programs.
• Diagnostic Transparency via STEP 7 / TIA Portal: The PS307 exposes a 24 V DC monitoring signal on pin X1 that can be wired to a digital input module, enabling the CPU to detect power supply degradation and trigger a programmatic alarm before a hard shutdown occurs.
• Seamless Rack Expansion: A single 6ES7307-1KA00-0AA0 can power a fully populated 11-slot S7-300 rack (CPU + 8 signal modules + 1 CP + 1 IM) with a 15–20% current headroom, eliminating the need for a second power supply in standard configurations.
• Reduced Cabinet Thermal Load: At 87% efficiency, the module dissipates 36 W at full load — approximately 19 W less than a 78%-efficient alternative. In a 10-rack installation, this reduces aggregate heat dissipation by 190 W, which can downsize the required cabinet air conditioning unit by one capacity class.
• Wide-Range Input Eliminates Tap Switching Errors: Automatic input voltage selection removes the risk of operator error when relocating equipment between 120 V and 230 V facilities — a common failure mode in MRO replacement scenarios.
• Hiccup-Mode Short-Circuit Recovery: Unlike latching shutdown designs, the PS307 automatically attempts restart after a 200 ms delay following a short-circuit event. This behavior allows the system to recover from transient wiring faults (e.g., connector insertion under load) without requiring a manual power cycle, reducing unplanned downtime in 24/7 process environments.
• Parallel Redundancy Support: Two units can be operated in parallel with external diode decoupling for N+1 redundancy, meeting IEC 62061 SIL 1 availability requirements for non-safety-critical power distribution architectures.
• Long-Term Spare Parts Availability: The 6ES7307-1KA00-0AA0 has been in continuous production since the S7-300 platform launch and remains available as a spare part under Siemens’ long-term supply commitment, reducing lifecycle risk for installations with 15–20 year operational horizons.

Quality Assurance & Global Logistics

Every unit of the 6ES7307-1KA00-0AA0 supplied by siemensplc.com is sourced through verified distribution channels and undergoes a structured pre-shipment inspection protocol. Physical authenticity checks include label verification against Siemens factory print specifications, housing parting-line inspection for mold consistency, and connector pin geometry measurement. Functional verification covers output voltage accuracy (target: 24.0 V ± 0.24 V at 5 A load), ripple measurement via 20 MHz bandwidth oscilloscope, and protection circuit actuation testing (short-circuit and overvoltage). Units that do not pass all checkpoints are quarantined and not shipped.

Logistics operations are based in Xiamen, China, a major export hub with direct access to DHL Express, FedEx International Priority, UPS Worldwide Express, and SF Express international services. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for every shipment. HS Code 8504.40 (static converters) is applied for customs classification. For time-critical procurement, same-day dispatch is available for in-stock units when orders are confirmed before 14:00 CST. Typical transit times: 2–4 business days to Europe and North America via express carriers; 3–6 business days to Southeast Asia and the Middle East.

All shipments are packed in anti-static foam-lined cartons with corner protection rated for 1.2 m drop testing per ISTA 1A. Tracking numbers are issued within 2 hours of dispatch. For project orders requiring 10+ units, dedicated freight consolidation and customs pre-clearance documentation are available upon request.

Contact Information

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