PROTEK

Industrial Switching Power Supply for CNC Control – PROTEK PU40-31SLC

The PU40-31SLC is an industrial switching power supply unit (“Switching Power Supply Unit”) manufactured by PROTEK POWER, part of the PU (Power Unit) product line. The main part number is PU4031SLC; the suffix “31SLC” identifies the output configuration and application profile. The unit is designed to supply logic boards, I/O modules, and peripherals in CNC control systems and industrial automation, providing regulated DC voltages from the AC mains supply. Unlike a simple transformer, it uses a switching topology to ensure high efficiency and active output stabilisation.

The power supply is the energy core of the control system: it converts AC mains voltage into regulated DC voltages essential for the operation of the CPU, I/O boards, display, and CNC drives. A power supply failure causes immediate machine shutdown and may lead to corruption of stored parameters or damage to downstream electronic modules. Out-of-tolerance voltages manifest as persistent alarms, unexpected resets, or failure of the control panel to power on.

PROTEK POWER is a manufacturer specialising in switching power supplies for industrial, CNC, and automation applications. The PU product line is designed for harsh environments, with integrated protections against overcurrent, overvoltage, and short circuit. The older versions of this family are legacy / discontinued and available only as used, surplus, or through specialist repair services.

Main Technical Specifications