Phoenix Contact 2866789 QUINT-PS/1AC/24DC/40 Replacement

Product Overview

Phoenix Contact 2866789 QUINT-PS/1AC/24DC/40 Replacement: Smooth Transition & Legacy System Compatibility

The Phoenix Contact 2866789 QUINT-PS/1AC/24DC/40 is a high-performance 24 VDC / 40 A single-phase DIN rail power supply engineered for demanding industrial control environments. As legacy power modules reach end-of-life or become increasingly difficult to source, facilities running older QUINT Power generation units — including the QUINT-PS/1AC/24DC/20 and QUINT-PS/1AC/24DC/30 — face mounting pressure to upgrade without disrupting live production lines. This replacement solution is designed to deliver a seamless, low-risk migration path that preserves existing wiring infrastructure, control cabinet space allocation, and system architecture.

Whether your facility operates a Siemens S7-300 PLC rack, an Allen-Bradley ControlLogix chassis, or a Schneider Electric Modicon M340 system, the 24 VDC bus voltage supplied by this unit remains fully compatible with standard I/O modules, communication gateways, and field devices. The 40 A output capacity provides sufficient headroom to power multiple distributed I/O nodes, Profibus DP repeaters, EtherNet/IP switches, and HMI panels simultaneously — eliminating the need for supplementary power boosters in most retrofit scenarios.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful power supply retrofit rarely involves a single component. When migrating from an older QUINT generation or a competing brand’s 24 VDC rail supply, engineers typically address the surrounding ecosystem in parallel. The QUINT-PS/1AC/24DC/40 integrates naturally with the QUINT-BUFFER/24DC/40 buffer module, which provides bridging time during brief mains interruptions — critical for systems where a Siemens ET 200SP distributed I/O station or a Phoenix Contact Axioline F I/O slice must remain live during power transitions.

For facilities upgrading communication infrastructure alongside the power rail, the FL SWITCH 2008 managed Ethernet switch and RAD-ISM-900-EN-BD wireless modules can be powered directly from the same 24 VDC bus. Terminal block wiring — particularly Phoenix Contact PTFIX distribution blocks and UK 6 N feed-through terminals — can be reused without modification, as the output connector pitch and wiring gauge requirements remain consistent across QUINT generations.

Where the legacy installation included a MINI-PS/1AC/24DC/2 auxiliary supply for panel lighting or signal conditioning, that unit can remain in place alongside the new 40 A primary supply. Similarly, MCR-SL signal conditioners and MACX analog isolators already installed in the cabinet continue to operate without reconfiguration. If the retrofit scope extends to the PLC backplane, the IB IL 24 PWR IN/PS Inline power terminal ensures clean power segmentation between the controller rack and field I/O segments.

For sites running Profinet or EtherNet/IP architectures, the FL COMSERVER UNI 232/422/485 serial gateway can be retained on the same power bus, preserving legacy serial device connectivity during the transition period before full protocol migration is complete.

Retrofit Guidance FAQ

Q: Is the wiring compatible with my existing installation?
A: Yes. The output terminal block uses the same 24 VDC positive/negative/PE arrangement as previous QUINT generations. Existing cable cross-sections (up to 16 mm²) are supported. No rewiring of field devices is required.

Q: Will my PLC program require modification?
A: No. The power supply is transparent to the control program. As long as the 24 VDC bus voltage remains within tolerance (±1%), all connected PLCs, I/O modules, and drives will continue executing existing logic without change.

Q: Is the housing physically compatible with my existing DIN rail space?
A: The 40 A model is approximately 130 mm wide — wider than the 20 A predecessor (~60 mm). Verify available horizontal clearance on the DIN rail before installation. In most standard 600 mm or 800 mm wide control cabinets, sufficient space is available.

Q: What communication protocols are supported?
A: The base unit operates as a standalone power supply with no fieldbus dependency. An optional QUINT-UPS interface module can be added for battery backup monitoring via Modbus or SNMP, compatible with most SCADA and BMS platforms.

Q: Can this unit replace a competing brand’s 24 VDC / 40 A supply?
A: Yes, provided the input voltage range (85–264 VAC, 1-phase) and output specifications match. Wiring adapters may be required if the competing unit used a proprietary connector. Consult the cabinet layout drawing before proceeding.

Q: How is system downtime minimized during changeover?
A: Pre-stage the new unit on a spare DIN rail section, pre-wire output terminals, and perform a hot-swap during a scheduled maintenance window. The QUINT-BUFFER module can sustain the 24 VDC bus for up to 500 ms during the switchover, eliminating controller restarts in most cases.

Warranty Assurance

Every Phoenix Contact 2866789 QUINT-PS/1AC/24DC/40 unit shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to dispatch, each unit undergoes output voltage calibration verification, load regulation testing, and visual inspection for physical integrity. Units that do not meet factory specifications are quarantined and not shipped.

In the event of a confirmed defect within the warranty period, TOPNLMS provides a replacement unit or full refund — whichever the customer prefers — with no return shipping cost to the buyer. Our average response time for warranty claims is under 24 business hours. Replacement units are dispatched from our Xiamen warehouse, with DHL Express and FedEx International Priority available for time-critical sites.

For procurement teams requiring documentation, we provide a certificate of conformity, packing list, and commercial invoice with each shipment. Bulk orders of 5 units or more qualify for priority allocation and dedicated account support.

Contact our technical sales team to confirm availability, lead time, and compatibility with your specific installation before placing your order.

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