Product Details

Modicon AS-P933-01 is a high-reliability redundant power supply module and stable rack power unit built for Modicon 900 series PLC chassis, produced under AEG Modicon legacy product line. This plc backup power module adopts dual independent 24 VDC input paths and supports automatic seamless failover. It converts the input power into clean regulated DC power to feed the rack’s CPU, I/O modules, communication adapters and onboard logic circuits. If one power source fails, the module switches to the standby path instantly without interrupting PLC operation, which is critical for continuous process control systems. It is designed for direct backplane insertion with built-in LED indicators to show power good status, input path activity and fault alarms. The integrated trim potentiometer allows fine adjustment of output voltage, and the internal filtering suppresses power-line noise from harsh factory environments. As a discontinued legacy spare, this redundant power supply module serves as a drop-in replacement to restore uninterrupted power distribution for ageing Modicon automation racks.

Basic Parameters

Brand: Modicon (AEG / Schneider legacy)

Model: AS-P933-01

Product Type: 120W Redundant Rack Mount Power Supply Module

Compatible Rack: Modicon 900 series PLC backplane and chassis

Input: Dual 24 VDC redundant input, operating range 18–30 VDC

Output: Regulated 24 VDC, adjustable ±5%, 5 A continuous, total 120 W

Switchover: Automatic seamless failover, less than 1 ms transfer time

Mounting: Single-slot backplane installation

Indicator: Front LED for power status, input path and fault warning

Termination: Heavy-duty screw terminal block for DC input

Product Status: Discontinued, end of original production

Net Weight: Approximately 0.96 kg

Supported Functions

This redundant power supply module delivers continuous regulated DC power for the whole control rack. The rack power unit monitors both input channels in real time and activates automatic switching when one input loses voltage or drops out of range. This plc backup power module supports overvoltage, overcurrent and thermal shutdown protection to safeguard downstream PLC hardware. It provides stable output under dynamic load fluctuations and sends fault status signals to the backplane for system diagnosis. It works cooperatively with Modicon CPU, analog, discrete and remote I/O modules to maintain non-stop operation of the control system. It also supports hot swap maintenance in qualified configurations to minimise plant downtime.

Core Functions

As a dedicated plc backup power module, this redundant power supply module acts as the reliable power backbone for critical Modicon control racks. Its dual-input redundant design eliminates single-point power failure risk, and it provides clean, low-ripple DC power for sensitive control electronics. The rack power unit isolates power disturbances and prevents fault propagation across the DC bus. It works as a direct spare to rebuild uninterruptible rack power supply for ageing Modicon automation racks.

Hardware Specifications & Environmental Features

Operating Temperature: -10°C ~ +60°C

Storage Temperature: -20°C ~ +70°C

Relative Humidity: 5%–95%, non-condensing

Housing: Shielded metal module casing with internal heat sink

Protection: Overload, short-circuit, overvoltage and overtemperature protection

Anti-interference: Built-in EMI filter and isolated power conversion circuit

Compatibility: Modicon 900 series chassis, Modicon legacy CPUs and matching I/O modules

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note：Confirm Modicon 900 rack compatibility, dual input wiring, total rack load current and voltage trim setting before ordering.

This is from our current stock.

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