Phoenix Contact QUINT-PS/1AC/48DC/10 Retrofit Power Supply

Phoenix Contact QUINT-PS/1AC/48DC/10 Retrofit-Compatible Power Supply for Legacy Systems

The Phoenix Contact QUINT-PS/1AC/48DC/10 (Part No. 2866682) is a single-phase, 48 VDC / 10 A DIN rail-mounted power supply engineered for demanding industrial environments. As a retrofit-compatible replacement unit, it is widely deployed in legacy control cabinet upgrades, discontinued spare part substitutions, and phased automation modernization programs across manufacturing, process control, and infrastructure sectors. NINERMAS maintains verified in-stock inventory of this unit with a 12-month warranty on every shipment.

Whether you are replacing an end-of-life QUINT-PS predecessor, migrating a control cabinet from 24 VDC bus architecture to a 48 VDC subsystem, or extending the operational life of a legacy PLC rack, the QUINT-PS/1AC/48DC/10 delivers the output stability, SFB (Selective Fuse Breaking) technology, and compact DIN rail footprint required for seamless integration without panel redesign.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

Integrating the QUINT-PS/1AC/48DC/10 into an existing automation system requires a structured pre-installation review. Begin by auditing the existing power budget in the control cabinet. Legacy systems often rely on older QUINT-PS/1AC/48DC/5 units that are no longer available through standard distribution channels. The 10 A output of the 2866682 provides additional current headroom, which is particularly valuable when the retrofit scope includes adding new I/O modules, communication gateways, or signal conditioning components.

For cabinets running a Siemens S7-300 or S7-400 PLC backbone, the 48 VDC rail typically powers field devices, solenoid valves, and remote I/O stations rather than the CPU rack itself. When replacing the power supply, confirm that the ET 200M distributed I/O stations or IM 153 interface modules connected to the 48 VDC bus remain within their input voltage tolerance window. Similarly, if the cabinet includes a PROFIBUS DP segment with RS-485 repeaters or optical link modules (OLM), verify that the communication link remains stable during the power supply changeover sequence.

In Allen-Bradley / Rockwell Automation environments, legacy ControlLogix or SLC 500 installations may use 48 VDC for field power distribution separate from the backplane supply. When retrofitting, cross-reference the 1756-PA75 or 1756-PB75 backplane power supply ratings against the new 48 VDC distribution load to ensure no cross-interference. If the cabinet also houses a 1734 POINT I/O adapter or 1769 CompactLogix expansion rack, document the I/O module addresses and verify that no address conflicts arise from the power interruption during swap-out.

For systems using Phoenix Contact’s own INTERBUS or Axioline F I/O platforms, the QUINT-PS/1AC/48DC/10 integrates naturally alongside AXL F BK ETH XC bus couplers and IB IL 24 DI 16 digital input modules. When the retrofit also involves migrating from serial INTERBUS to EtherNet/IP or PROFINET, the power supply changeover can be coordinated with the communication module swap to minimize total downtime. Pair the QUINT-PS/1AC/48DC/10 with a QUINT-DIODE/40AC/2X20/1X40 redundancy module if the application requires N+1 power redundancy for high-availability lines.

Signal isolators such as the MACX MCR-SL-RPSSI-I series may also be present in legacy cabinets to condition 4–20 mA loops before they reach the PLC analog input cards. These isolators typically operate on 24 VDC auxiliary power, so they are unaffected by the 48 VDC supply replacement, but their wiring should be documented and protected during the retrofit to avoid accidental disconnection. Likewise, any installed TRIO-PS/1AC/24DC/10 or MINI-PS units powering 24 VDC logic circuits should be clearly labeled and isolated from the 48 VDC work scope.

Installation space is a critical constraint in dense control cabinets. The QUINT-PS/1AC/48DC/10 occupies approximately 82 mm of DIN rail width. Before ordering, measure the available rail space and confirm that adjacent components — including circuit breakers, terminal blocks, and cable ducts — allow for the unit’s depth clearance and adequate convection cooling. If space is marginal, consider relocating the QUINT-CHECK diagnostic module or repositioning the PE/N terminal blocks to create the required gap.

Downtime Control During System Migration

Minimizing production downtime is the primary operational concern during any power supply retrofit. For the QUINT-PS/1AC/48DC/10 replacement, a structured hot-swap preparation protocol significantly reduces risk. Before the scheduled maintenance window, perform a full backup of the PLC program using STEP 7, TIA Portal, or RSLogix 5000, depending on the controller platform. Export all HMI screen configurations from the WinCC, FactoryTalk View, or Proface GP-Pro EX project to a secure offline location. This ensures that if the CPU loses its retentive memory during the power interruption, the program can be restored within minutes rather than hours.

During the swap, isolate the 48 VDC distribution bus using the upstream circuit breaker or disconnect switch — do not rely solely on the power supply’s output switch. Tag out the incoming AC supply in accordance with LOTO (Lockout/Tagout) procedures. Remove the old unit from the DIN rail, install the QUINT-PS/1AC/48DC/10, and reconnect the AC input and DC output terminals in sequence. Before re-energizing, use a multimeter to verify output polarity and confirm no short-circuit condition exists on the 48 VDC bus.

After energizing, monitor the output voltage under no-load conditions first, then progressively reconnect field devices. The QUINT-PS/1AC/48DC/10’s SFB technology will automatically detect and isolate any downstream short-circuit without tripping the entire 48 VDC bus, which is a significant advantage over older power supply designs that required manual fuse replacement. Once all field devices are confirmed operational, restore the PLC to RUN mode and verify that all I/O signals, communication links, and HMI displays reflect the correct process state before releasing the system to production.

For critical continuous-process applications where even a brief power interruption is unacceptable, pre-stage the QUINT-PS/1AC/48DC/10 in a parallel temporary power feed configuration using a QUINT-DIODE redundancy module. This allows the new unit to be brought online and verified under load before the old unit is disconnected, achieving a near-zero-downtime changeover.

Retrofit Support FAQ

Q1: Is the QUINT-PS/1AC/48DC/10 (2866682) a direct replacement for the QUINT-PS/1AC/48DC/5?
A: Yes, the 2866682 is mechanically and electrically compatible with the same DIN rail slot and terminal layout as the earlier 5 A variant. The 10 A output provides additional current capacity, which is beneficial if the load has grown since the original installation. Verify that the upstream circuit breaker rating is appropriate for the higher available current.

Q2: What pre-shipment testing does NINERMAS perform on this unit?
A: Every QUINT-PS/1AC/48DC/10 unit shipped by NINERMAS undergoes a functional power-on test confirming correct output voltage, SFB response, and no-load stability before dispatch. Units are covered by a 12-month warranty from the date of shipment.

Q3: Can this power supply be used in a redundant 48 VDC configuration?
A: Yes. Two QUINT-PS/1AC/48DC/10 units can be connected in parallel via a QUINT-DIODE/40AC/2X20/1X40 or equivalent decoupling diode module to achieve N+1 redundancy. Each unit must be set to the same output voltage. The diode module prevents reverse current flow and ensures seamless load transfer if one unit fails.

Q4: What is the lead time and stock availability?
A: NINERMAS maintains warehouse stock of the QUINT-PS/1AC/48DC/10 (2866682) for immediate dispatch. Standard lead time for in-stock units is 3–7 business days depending on destination. For large-quantity orders or long-term spare parts programs, contact our team to discuss reserved stock agreements and volume pricing.