PHOENIX CONTACT QUINT-PS/1AC/24DC/40 Industrial Power Supply – QUINT POWER

PHOENIX CONTACT QUINT-PS/1AC/24DC/40 — 960 W Primary-Switched DIN Rail Power Supply for High-Demand Industrial Control Systems

The QUINT-PS/1AC/24DC/40 occupies the top tier of PHOENIX CONTACT’s QUINT POWER series: a 24 VDC, 40 A (960 W) primary-switched power supply engineered for continuous duty in industrial control panels, process automation cabinets, and safety-critical machine architectures. Its role in a control loop is not passive voltage conversion — it actively participates in system protection through Selective Fuse Breaking (SFB) technology, provides hardwired diagnostic feedback to the PLC, and sustains output regulation across a universal AC input range without operator intervention. For system integrators specifying power infrastructure in Siemens S7, Beckhoff TwinCAT, or Schneider Modicon environments, this unit delivers the electrical determinism that downstream field devices and I/O modules depend on.

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Technical Parameters

Hardware Logical Analysis

The QUINT-PS/1AC/24DC/40 is built on a two-stage power conversion architecture. The first stage is an active Power Factor Correction (PFC) boost converter that rectifies the AC input and elevates it to a regulated 400 VDC intermediate bus, simultaneously shaping the input current waveform to achieve PF > 0.99. This eliminates the low-order harmonic currents (3rd, 5th, 7th) that degrade transformer and cable sizing in industrial facilities, and ensures compliance with EN 61000-3-2 Class A without external line reactors.

The second stage is an LLC resonant half-bridge DC/DC converter operating at variable frequency. LLC topology achieves zero-voltage switching (ZVS) on the primary MOSFETs and zero-current switching (ZCS) on the secondary rectifier diodes across the full load range, which is the primary mechanism behind the ≥ 95.5% efficiency figure. Unlike hard-switched topologies, switching losses are near-zero at resonance, and the absence of hard-switching transients reduces conducted EMI at the source — the internal EMC filter handles residual common-mode and differential-mode noise to meet EN 55011 Class B limits.

SFB (Selective Fuse Breaking) Circuit: This is the defining hardware differentiator of the QUINT POWER series. A dedicated current-sensing and control loop monitors the output bus continuously. When a downstream branch circuit draws current above the SFB threshold (typically 105% of rated output), the controller commands the output stage to deliver up to 200% rated current (80 A) for a minimum of 12 ms. This pulse is calibrated to exceed the I²t clearing energy of standard 10 A – 25 A branch fuses, ensuring the faulted branch clears before the main supply trips. The result: a single downstream short-circuit does not collapse the 24 VDC bus for all other loads. After the fuse clears, the supply returns to normal regulation within one AC cycle. No external current-limiting module or oversized upstream breaker is required to achieve this selectivity.

DC OK Relay Logic: The floating relay contact (normally closed) opens when output voltage deviates beyond ±15% of the set point. This contact is wired directly to a PLC digital input (DI) or safety relay monitoring circuit. Unlike a simple LED indicator, the hardwired relay signal is deterministic — it does not depend on firmware polling cycles or fieldbus communication latency. In a Siemens S7-1500 architecture, this signal can be mapped to a hardware interrupt OB (OB40) for sub-millisecond fault response, enabling the PLC to execute a controlled shutdown sequence before downstream devices lose power.

EMC Design: The unit incorporates a multi-stage input EMC filter (common-mode choke + X/Y capacitors) on the AC input, and the LLC converter’s inherent soft-switching behaviour minimises high-frequency conducted emissions on the DC output. The metal housing provides shielding continuity, and the DIN rail mounting clip establishes a low-impedance ground path to the panel earth bar — critical in environments with variable-frequency drives (VFDs) or high-power contactors generating common-mode noise on the ground plane.

System Integration Benefits

• Deterministic Bus Voltage Under Transient Load: The LLC resonant stage maintains output regulation within ±1% during step-load transients (0% to 100% load in < 1 ms), preventing voltage dips that could reset PLC CPUs or corrupt SRAM-backed data in I/O modules.
• Selective Fault Isolation Without Bus Collapse: SFB technology clears downstream branch faults without interrupting the main 24 VDC bus, preserving system uptime for all non-faulted loads — a direct reduction in unplanned downtime events.
• Hardwired Diagnostic Integration: The DC OK relay contact provides a PLC-readable, latency-free power health signal that can trigger hardware interrupt routines, SCADA alarms, or safety function monitoring without relying on software polling.
• N+1 Redundancy Architecture: Two QUINT-PS/1AC/24DC/40 units paired with a QUINT-DIODE/40 ORing module form a fully redundant 24 VDC supply with automatic, bumpless failover — no single point of failure on the power rail.
• Capacitive Bridging Compatibility: Direct connection to QUINT-BUFFER/24DC/40 capacitive buffer modules extends hold-up time from 20 ms to several seconds at partial load, bridging mains interruptions without battery maintenance overhead.
• Universal Input Eliminates Voltage Selection Errors: The 85–264 VAC wide-range input accepts 100 VAC (Japan), 120 VAC (North America), 230 VAC (Europe/Asia), and 240 VAC (Australia/UK) without tap switching, eliminating a common commissioning error in globally deployed machine platforms.
• ATEX Zone 2 / IECEx Certification: Permits installation in control rooms adjacent to Zone 2 hazardous areas (flammable gas, vapour) without requiring an intrinsically safe barrier on the power supply itself, simplifying panel layout in petrochemical and offshore applications.
• High Efficiency Reduces Thermal Load: At ≥ 95.5% efficiency, the unit dissipates approximately 45 W at full load. Compared to a 90% efficient alternative dissipating 107 W, this 62 W reduction directly lowers enclosure cooling requirements — smaller heat exchangers, lower fan speeds, and extended MTBF for all temperature-sensitive components in the panel.
• Compact 82.5 mm Width Maximises Panel Density: Delivering 960 W in an 82.5 mm DIN rail footprint allows adjacent mounting of redundancy modules, buffer modules, and circuit breakers within a standard 600 mm wide enclosure without requiring a second panel section.
• Long MTBF Supports Predictive Maintenance Scheduling: The > 500,000-hour MTBF figure (MIL-HDBK-217F, 25 °C) provides a statistically grounded basis for maintenance interval planning in asset management systems (SAP PM, Maximo), reducing reactive maintenance events.

Quality Assurance & Global Logistics

Every PHOENIX CONTACT QUINT-PS/1AC/24DC/40 unit supplied by siemensplc.com is sourced through verified channels with full traceability. Pre-shipment inspection covers original manufacturer labelling, date code consistency, connector and terminal integrity, and packaging authenticity. Certificates of conformity and factory test reports are available upon request for project documentation and third-party audits.

Logistics operations are based in Xiamen, China — a major international freight hub with direct access to DHL Express, FedEx International Priority, and UPS Worldwide Expedited services. Standard order processing time is 1–2 business days. International express delivery to Europe, North America, Southeast Asia, and the Middle East typically completes in 3–7 business days depending on destination customs clearance. For time-critical project requirements, same-day dispatch is available on confirmed stock. All shipments include full tracking, commercial invoice, and packing list documentation compliant with customs requirements in major import markets. Bulk project orders and consolidated shipments are accommodated with competitive freight rates.

All units carry a 12-month warranty from the date of shipment. Warranty claims are handled directly by the siemensplc.com technical team — no third-party RMA routing. Replacement or credit is processed within 5 business days of fault confirmation.

Contact Information

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