Phoenix Contact QUINT-PS/1AC/24DC/20 DIN Rail Power Supply – QUINT Series

Phoenix Contact QUINT-PS/1AC/24DC/20 — Single-Phase DIN Rail Power Supply in Industrial Control Architecture

The Phoenix Contact QUINT-PS/1AC/24DC/20 is a single-phase switched-mode DIN rail power supply rated at 24 VDC / 20 A (480 W), designed for continuous-duty operation in industrial control panels, process automation cabinets, and safety-critical infrastructure. Within a control loop, this unit occupies the role of the primary DC bus source — converting wide-range AC mains into a regulated, low-ripple 24 VDC rail that feeds PLCs, distributed I/O nodes, field transmitters, solenoid valve banks, and HMI equipment simultaneously.

Unlike commodity SMPS units, the QUINT-PS/1AC/24DC/20 integrates Phoenix Contact’s proprietary SFB Technology (Selective Fuse Breaking), which delivers a controlled boost current of ≥ 60 A for 12 ms upon a downstream short-circuit event. This transient overcurrent pulse is sufficient to selectively blow branch-circuit fuses rated up to 10 A without tripping the supply itself, preserving bus integrity for all unaffected loads. The result is a deterministic fault-isolation mechanism that eliminates the need for external current-limiting modules in most panel architectures.

The unit’s active power factor correction (PFC) circuit maintains a power factor of > 0.99 across the full load range, reducing reactive current draw on the facility’s distribution network and complying with IEC 61000-3-2 Class A harmonic limits. This is particularly relevant in installations where multiple power supplies share a common AC feed — a scenario common in large PLC marshalling cabinets and motor control centers.

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Technical Parameters

Hardware Logical Analysis

The QUINT-PS/1AC/24DC/20 is built on a full-bridge LLC resonant topology, which achieves zero-voltage switching (ZVS) across the primary MOSFETs at all load conditions. This eliminates switching losses that are characteristic of hard-switched PWM designs, directly contributing to the ≥ 93.5% efficiency figure and reducing thermal stress on the transformer core and output rectifier diodes. The LLC resonant tank — comprising the magnetizing inductance, leakage inductance, and resonant capacitor — is tuned to operate at a fixed switching frequency near resonance under nominal load, with frequency modulation used only for load regulation. This approach minimizes EMI generation at the switching node, a critical advantage in environments where nearby analog signal conditioning circuits or fieldbus transceivers are sensitive to conducted interference.

The SFB circuit is implemented as a dedicated current-injection path, separate from the main regulation loop. Upon detection of an output voltage collapse below a threshold (indicative of a hard short), the SFB controller bypasses the normal current limit and drives the output stage into a timed high-current pulse. The 12 ms duration is calibrated to the I²t characteristic of standard IEC 60269 gG fuses in the 2–10 A range, ensuring reliable fuse clearing without thermal damage to the supply’s output filter capacitors or PCB traces. After the pulse, the supply enters a hiccup restart cycle, confirming fault clearance before resuming normal regulation.

EMC performance is achieved through a multi-stage input filter: a common-mode choke attenuates differential-mode noise above 150 kHz, while X and Y capacitors suppress common-mode conducted emissions to meet EN 55011 Class B limits. The output stage incorporates a π-filter with low-ESR electrolytic capacitors and a ferrite bead array, holding output ripple below 50 mV peak-to-peak across the full load range. The metal housing provides a Faraday shield against radiated emissions, with the DIN rail clip serving as the primary chassis ground bond — a design detail that ensures the supply’s ground reference is tied directly to the panel’s protective earth rail.

The relay signaling output uses a normally-closed (NC) contact configuration. Under normal operation, the relay is energized and the contact is open. A loss of output regulation — whether from input undervoltage, overtemperature, or output overload — de-energizes the relay, closing the NC contact and driving a fault signal to the PLC digital input or SCADA alarm module. This fail-safe logic ensures that a supply failure is always reported, even in the event of a complete power loss to the signaling circuit.

System Integration Benefits

• Deterministic fault isolation via SFB: The ≥ 60 A / 12 ms boost pulse selectively clears branch fuses without interrupting the main 24 VDC bus, preserving uptime for all unaffected loads — a behavior that passive current-limiting supplies cannot replicate.
• Wide AC input range eliminates tap selection: The 85–264 VAC universal input operates across all global grid standards (100 V JP, 120 V NA, 230 V EU, 240 V AU) without manual voltage selection, simplifying panel design for export machinery and multi-site deployments.
• Active PFC reduces infrastructure cost: A power factor > 0.99 minimizes reactive current on the facility’s distribution network, reducing cable sizing requirements and avoiding power factor penalty charges in industrial tariff structures.
• Parallel redundancy with QUINT-ORING: The supply supports 1+1 and N+1 redundant configurations when paired with the QUINT-ORING/24DC/2X20/1AC module, enabling hot-standby architectures for SIL 2 and high-availability process control applications.
• Relay output for SCADA/PLC integration: The NC relay contact provides a hardware-level fault signal directly compatible with PLC digital input modules (24 VDC sourcing or sinking), enabling alarm annunciation without additional signal conditioning.
• Adjustable output voltage for load optimization: The 18–29.5 VDC output trim range allows the bus voltage to be set above nominal (e.g., 26–27 VDC) to compensate for cable voltage drop in distributed I/O architectures with long wiring runs.
• Extended temperature rating for harsh environments: The −25 °C to +70 °C operating range covers outdoor enclosures, unheated machinery rooms, and high-ambient process areas without derating, unlike standard industrial PSUs rated to +60 °C.
• Compact 60 mm DIN rail footprint: The 60 mm width allows four units to occupy the same rail space as a single 240 mm legacy linear supply, freeing panel real estate for additional I/O modules, terminal blocks, or circuit breakers.
• ATEX Zone 2 approval for hazardous areas: The ATEX II 3 G Ex nA IIC T4 Gc certification permits installation in Zone 2 classified areas (oil & gas, chemical processing) without requiring an additional purged or pressurized enclosure.
• High MTBF reduces lifecycle maintenance cost: The > 500,000 h MTBF figure (IEC 61709 methodology, 25 °C, full load) translates to a predicted mean time between failures exceeding 57 years at continuous operation — a metric that supports 10-year maintenance interval planning in process plant environments.

Quality Assurance & Global Logistics

Every Phoenix Contact QUINT-PS/1AC/24DC/20 unit supplied by siemensplc.com is sourced through documented procurement channels and undergoes a structured pre-shipment verification process. Physical inspection covers housing integrity, label authenticity, connector pin geometry, and serial number format cross-referenced against Phoenix Contact’s batch coding conventions. Functional verification confirms output voltage regulation, SFB trigger response, and relay contact continuity under load prior to packaging.

Shipments originate from our warehouse in Xiamen, Fujian Province, China — a logistics hub with direct access to Xiamen Gaoqi International Airport and Xiamen Port, supporting both air freight and sea freight consolidation. Standard export documentation is provided with every order: commercial invoice, packing list, certificate of origin, and HS code 8504.40 classification. Certificates of Conformity are available on request.

• Domestic China: Same-day dispatch; SF Express or JD Logistics, 1–2 business days.
• Southeast Asia: 3–5 business days via DHL Express or EMS.
• Europe: 5–8 business days via FedEx International Priority or UPS Worldwide Express.
• North America: 6–10 business days via FedEx International Priority.
• Middle East & Africa: Available on request — contact us for freight quotation and lead time.
• Minimum order: 1 unit. Volume pricing available for orders ≥ 5 units.
• Warranty: 12 months against manufacturing defects. DOA units replaced within 7 business days of confirmed receipt.

Contact Information

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