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The Schneider Electric 140CPS11420 is an AC power supply module for the Modicon Quantum I/O backplane, delivering a regulated 5 VDC bus to CPU and I/O modules in process and discrete control cabinets. Plants running legacy Quantum systems still rely on this module for steam, water-treatment, and packaging lines, and replacement units remain the fastest path to keep a Quantum rack in service rather than migrating the whole controller. This page consolidates the verified specifications, same-series alternatives, and pairing modules that ship from Rabwellplc, so engineers can confirm the part fits the existing backplane before placing the order.
140CPS11420 Technical Specifications
- Series: Modicon Quantum power supply, standalone style
- Input voltage: 115 / 230 VAC, selectable
- Output: 5 VDC regulated, 8 A maximum to the Quantum backplane
- Backplane compatibility: Modicon Quantum 140 XBP series racks (4, 6, 10, and 16 slot)
- Module footprint: occupies one slot, latched at top and bottom
- Diagnostic LEDs: Ready, Battery Low, DC OK indicators on the front face
- Battery backup: lithium battery socket on front face for CPU memory retention
- Operating temperature: 0 to 60 degC
- Approvals: UL, CSA, CE, FM Class I Div 2 (verify the date code on the unit)
Always cross-check the printed spec on the side label before commissioning. Older revisions of the 140CPS11420 use a different battery part and slightly different inrush current curve, which matters when the cabinet has a small UPS in front of the rack.
Same-Series Comparison: 140CPS Power Supply Family
| Model | Input | Output @ 5 VDC | Typical use |
|---|---|---|---|
| 140CPS11100 | 115/230 VAC | 3 A standalone | Small Quantum racks, low I/O count |
| 140CPS11410 | 115/230 VAC | 8 A summable | Redundant pairs in summable mode |
| 140CPS11420 | 115/230 VAC | 8 A standalone | Single-supply Quantum racks, the most common spare |
| 140CPS12420 | 24 VDC | 8 A standalone | DC-fed cabinets, solar/battery plants |
| 140CPS21100 | 24 VDC | 3 A standalone | Compact DC racks |
The two parts most often confused with the 140CPS11420 are the 140CPS11410 and the 140CPS11100. The 11410 is electrically similar but designed for summable redundant operation; if a plant is running a single supply rack, the 11420 is the correct drop-in. The 11100 has the same form factor but only 3 A on the 5 VDC bus, which is not enough once the rack carries dense analog or Ethernet modules.
Compatible Components and Common Pairings
A 140CPS11420 typically lives in a Quantum rack alongside these modules, all of which Rabwellplc carries:
- CPUs: 140CPU65150, 140CPU65160, 140CPU67160 — newer Unity-capable processors that benefit from the 8 A budget
- Ethernet: 140NOE77111 Ethernet TCP/IP module for plant-floor connectivity
- Discrete I/O: 140DDI35300, 140DDO35300 24 VDC input/output groups
- Analog: 140ACI04000, 140AVI03000 process-grade analog modules
- Backplane: 140XBP00400, 140XBP00600, 140XBP01000, 140XBP01600 racks
Common Use Cases
- Direct replacement of a failed power supply in an existing Quantum rack with no other engineering work
- Spare-parts inventory for water/wastewater SCADA panels still standardized on Quantum
- OEM machine rebuilds where the customer has not approved migration to M580 or M340
- Pulp, paper, and steel mills running long-life Quantum installations on AC mains
Why Buy the 140CPS11420 from Rabwellplc
Rabwellplc stocks the 140CPS11420 as a US-shipping spare for the Modicon Quantum platform. Each unit is inspected, the date code is recorded, and a fresh lithium backup battery option is offered at order time. For sites running mixed Schneider hardware, the catalog also covers the matching Schneider Modicon range, so a single PO can refresh the rack instead of chasing parts across distributors.
Need a 140CPS11420 today? Check live stock and date codes on the 140CPS11420 product page and request a quote with your rack revision.
Frequently Asked Questions
Is the 140CPS11420 a drop-in replacement for the 140CPS11410?
Mechanically yes, but electrically they target different rack designs. The 11410 is meant for summable redundant pairs, the 11420 for single-supply racks. If the existing rack only has one power supply slot in use, order the 11420.
Does the 140CPS11420 work with both 115 VAC and 230 VAC?
Yes. The module accepts 115 VAC or 230 VAC nominal input, with no jumper change required for most revisions. Confirm against the label on the side of the unit before connecting.
How much 5 VDC current does the 140CPS11420 deliver to the backplane?
Up to 8 A on the 5 VDC bus. Sum the current draw of the CPU and every I/O card in the rack against that budget; if the planned rack exceeds 8 A, move to a summable design with two 140CPS11410 modules.
Does the 140CPS11420 fit Modicon M340 or M580 racks?
No. The 140CPS series is specific to Quantum 140 XBP backplanes. M340 uses BMXCPS supplies and M580 uses BMEXBP racks; the form factor and bus protocol are different.
What battery does the 140CPS11420 use for memory backup?
A 3.6 V lithium battery in the front-face socket. Schneider recommends replacing it on a periodic schedule; Rabwellplc can include a fresh battery with the order on request.