The RELIANCE 57493A is a 376W industrial power supply module designed for the AutoMax DCS/PLC platform, providing stable DC power to the rack and I/O modules. Built with heavy‑duty components, it offers high efficiency, built‑in surge protection, and long‑term reliability for harsh industrial environments.

RELIANCE is the brand. 57493 denotes the AutoMax series high‑power supply family. The suffix A indicates a revised hardware version with improved thermal design and component upgrades. It is also referenced as 57C493 or O‑57493‑1.

Input voltage is 100/120VAC, 50/60Hz, with input current 7.8A at 100VAC and 6.5A at 120VAC. Output power is 376W, providing regulated DC voltages for the backplane. It features overvoltage, overcurrent, and short‑circuit protection. Operating temperature ranges from 0°C to +60°C. It is a single‑slot module with power and fault LED indicators.

It connects to the AutoMax rack via a dedicated backplane connector for power distribution and status signaling. An AC input terminal block is provided for mains wiring. No user‑configurable switches are present; status is monitored through the system diagnostic software. It does not support external communication protocols.

Converts 100/120VAC mains into stable DC power for the AutoMax rack and I/O modules. Provides overvoltage, overcurrent, and short‑circuit protection to safeguard connected equipment. Maintains consistent output voltage under varying load conditions. Reports power and fault status to the system controller.

Used in AutoMax DCS and PLC systems for industrial automation, process control, and motion control. Commonly deployed in manufacturing, steel, pulp and paper, and material handling industries. Ideal for powering central control cabinets and remote I/O racks requiring high‑reliability power.

Before installation, verify the AC input voltage matches the module rating. Install into a single AutoMax slot with the system powered off. Wire the AC mains to the input terminal block. During operation, ensure adequate ventilation and avoid exposure to dust or corrosive gases. Regularly inspect wiring for looseness or damage. If the fault LED illuminates, power off the system and check for short circuits or overloads. Replace only with the same model 57493A to ensure compatibility.