When a 48 V DC Bus Needs a Reliable 5.1 V Rail
A system integrator once faced a familiar problem: a Modicon Quantum rack running on a 48 V DC bus, with no stable 5.1 V rail to power the I/O modules. The fix was the Schneider Electric 140CPS42400C, a power supply module from the Modicon Quantum series. It accepts 48–60 V DC input and delivers a steady 5.1 V DC output, making it a practical choice for DC-powered control panels in oil, gas, and industrial automation.
What the 140CPS42400C Delivers
The 140CPS42400C is built for continuity. Its 13 ms hold-up time at 48 V keeps the output stable during brief input interruptions, so the PLC rack rides through short power dips without dropping I/O. The module provides up to 8 A of redundant output current, supporting fail-safe architectures where a single supply failure must not stop the process. Internal overload and overvoltage protection reduce the risk of damage from faults, while a 2 A time-lag fuse guards against short circuits.
A green LED (PWR OK) gives local status at a glance. The alarm output (1 NC, 6 A @ 220 V) can signal abnormal conditions to a monitoring system. With input current at ≤ 3.8 A and power dissipation of 17.2 W, the module runs efficiently and keeps cabinet heat manageable.
Technical Specifications
| Specification | Value |
|---|---|
| Product Line | Modicon Quantum |
| Input Voltage | 48–60 V DC |
| Output Voltage | 5.1 V DC |
| Output Current | 8 A redundant |
| Hold-up Time | 13 ms @ 48 V |
| Fuse Rating | 2 A time-lag |
| Input Current | ≤ 3.8 A |
| Inrush Current | 14 A @ 40 V |
| Alarm Output | 1 NC, 6 A @ 220 V |
| Power Dissipation | 17.2 W |
| Overload Protection | Internal |
| Overvoltage Protection | Internal |
| Local Signaling | 1 green LED (PWR OK) |
| Marking | CE |
Where It Fits
In oil and gas, the 140CPS42400C suits remote wellhead panels and pipeline RTUs where DC power is available and AC is not. Its 48–60 V DC input matches common telecom and DC bus voltages, and the 8 A redundant output supports critical shutdown or monitoring racks. In factory automation, it powers Quantum I/O in DC-fed cabinets, and the 13 ms hold-up time helps ride through contactor switching or brief brownouts. For upgrade projects, it replaces aging supplies in existing Quantum racks without changing the backplane.
Integration and Selection Notes
This module integrates directly into Modicon Quantum racks. Before ordering, confirm your rack’s power requirements and input source match the 48–60 V DC range. The 140CPS42400C carries CE marking. For wiring, follow Schneider Electric’s installation guide; if you need help matching this supply to your rack configuration, Oil AutoTech offers hands-on technical selection support. Spares when you need them — fast dispatch, worldwide.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
