6ES5 955-3LC14 Siemens SIMATIC S5 Power Supply Module

Detailed Description 6ES5 955-3LC14 is a plug-in power supply unit for Siemens SIMATIC S5 S5-115U PLC rack. It accepts universal AC input 115V or 230V, converts mains voltage into stable 5V DC backplane power to supply CPU, signal modules and other rack components. Widely deployed in legacy chemical, metallurgy, printing and material-handling automation systems with SIMATIC S5 controllers.

This PSU delivers rated 5V DC output current to support full rack module configuration. Built-in overcurrent, overvoltage and short-circuit protection will shut down output automatically under overload or short-circuit conditions to protect the S5 backplane and adjacent PLC modules. Front panel LED indicators display power ready and fault status for fast on-site diagnosis. It connects to the S5 backplane bus directly once inserted into the rack, no extra backplane wiring required.

The module uses industrial-grade components, IP20 protection for cabinet installation, operating temperature range 0~60℃. It provides power-fail detection signal to the S5 CPU before voltage drops, enabling the controller to save critical data and perform safe shutdown to prevent program loss. It supports module replacement under power-off condition for convenient maintenance. Compact form factor fits standard S5 rack slot and saves cabinet space.

6ES5 955-3LC14 is discontinued legacy Siemens S5 PLC spare part. Many long-running industrial plants still rely on SIMATIC S5 automation systems. When the original power supply fails, replacing it with identical 6ES5 955-3LC14 can reuse existing S5 rack, CPU, I/O modules and original PLC program without program modification or mechanical reconstruction. Technicians insert the module into rack and verify power status, so the whole PLC system resumes operation rapidly and cuts production downtime.

Before shipment, every 6ES5 955-3LC14 undergoes comprehensive functional inspection including power-on test, output voltage measurement, overload protection test and LED indicator check. All products come with 12-month warranty. Our automation technical team provides remote support for rack installation, wiring guidance and fault diagnosis. Fast global shipping is available for urgent maintenance orders.

For automation maintenance engineers and system integrators, 6ES5 955-3LC14 is reliable replacement power supply for legacy Siemens SIMATIC S5 control racks. It restores stable bus power supply for S5 PLC systems, extends service life of old automation assets and avoids high-cost whole control system upgrade.