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Key Technical Specifications
| Parameter | Specification |
| Manufacturer | Schneider Electric / Modicon |
| Part Number | 140CPS11420 |
| Product Series | Modicon Quantum |
| Input Voltage | 115 V AC / 230 V AC (85 to 132 V AC / 170 to 264 V AC) |
| Input Frequency | 47 to 63 Hz |
| Output Voltage | 5.1 V DC (Backplane bus) |
| Output Current | 3 A continuous |
| Total Power Output | 15 W |
| Inrush Current | 18 A at 115 V AC / 38 A at 230 V AC |
| Isolation Voltage | 1,500 V AC input to backplane |
| Overvoltage / Overcurrent Protection | Internal electronic shutdown with auto-reset |
| Operating Temperature | 0 to 60 °C (32 to 140 °F) |
Product Introduction & Supply Chain Strategy
The Modicon 140CPS11420 is a 115/230 V AC standalone power supply module designed to deliver regulated 5.1 V DC backplane power (up to 3 A) to Quantum PLC racks. It serves as the primary power source for smaller Quantum backplanes housing CPUs, communication adapters, and local I/O modules in industrial automation environments.
Because Schneider Electric has retired the Modicon Quantum lineup, securing this unit as New Surplus is a vital risk-mitigation strategy. A power supply failure instantly downs the entire rack. Keeping a factory-sealed 140CPS11420 on-site eliminates long lead times, avoids the high risk of degraded electrolytic capacitors common in refurbished power supplies, and minimizes your Total Cost of Ownership (TCO).
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
Execute strict Lock-Out/Tag-Out (LOTO) procedures on the incoming 115/230 V AC power line feeding the rack. Put on an anti-static wrist strap connected to plant ground. Verify that the AC input line match switch on the module (if applicable) or wiring configuration matches your plant supply voltage (115 V AC or 230 V AC).
Stage 2: Removal
Disconnect the field terminal block powering the existing power supply. Release the top and bottom mounting latches on the Quantum rack slot. Gently pull the old module straight out from the backplane, ensuring no force is applied at an angle to protect the backplane connectors.
Stage 3: Installation (Clone & Seat)
Examine the rear backplane connector pins on the new 140CPS11420 to confirm zero transport damage or contamination. Align the module with the guide rails in Slot 1 or Slot 2 of the Quantum backplane. Push firmly until the top and bottom latches snap securely into place. Re-attach the AC power terminal block.
Stage 4: Power-On & Testing
Confirm proper AC voltage at the terminal connections using a digital multimeter prior to energizing. Apply power and verify the PWR OK LED turns solid green. Check that backplane-powered modules (CPU, I/O) initialize properly without overcurrent trip faults.
140CPS11420
140CPS11420
Firmware/Software Versions & Upgrade Notes
- Firmware Dependency: As a hardware power supply module, the 140CPS11420 does not run onboard firmware and does not require software flashing.
- System Design Compatibility: Ensure total backplane current draw from all CPU, NOE, and I/O modules installed on the rack does not exceed the 3 A (15 W) threshold of this power supply. For higher current demands, evaluate the 8 A (140CPS11410) or 11 A variants.
- Hardware Swap Warning: Never swap power supply modules under load without checking total system power draw. Swapping to a lower-amperage PSU on a fully populated rack will trigger thermal overload or backplane voltage drops.
Frequently Asked Questions (FAQ)
Is this 140CPS11420 module brand new or pulled from a used system?
This unit is guaranteed 100% New Surplus / Original New. It has never been installed in an active plant rack, pulled from a decommissioned system, or subjected to component repairs. It retains full factory lifespans.
Why shouldn’t I buy a cheaper refurbished power supply module?
Power supplies contain electrolytic capacitors that dry out and degrade over time, even when idle. Refurbished power units often reuse old capacitors that can fail under high thermal stress, causing voltage spikes that damage expensive Quantum CPUs and I/O cards. Buying New Surplus eliminates this hidden failure point.
What happens if my backplane load demands more than 3 A?
The 140CPS11420 delivers up to 3 A at 5.1 V DC. If your rack configuration exceeds 3 A, the module’s internal overcurrent protection will trip, causing the system to shut down. You must calculate total backplane current in your programming software (EcoStruxure / Concept) before deployment.
Can the 140CPS11420 be used in a redundant power supply configuration?
No, the 140CPS11420 is a standalone power supply. If your application requires redundant power supply units (PSUs) on a Quantum rack, you must select redundant-capable modules such as the 140CPS12420 or 140CPS22400 along with a redundant backplane.
What warranty is included with this New Surplus power supply?
We supply all New Surplus 140CPS11420 modules with a full 1-year replacement warranty. Every unit passes physical inspection and static electrical continuity checks before shipping in ESD-protective packaging.
