Reliance 57C493 Power Supply – Obsolete AUTOMAX Spare Part

Technical Dossier

Product Details And Specifications

Reliance 57C493 Power Supply – Obsolete AUTOMAX Spare Part

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Note: Electrical parameters such as input/output voltage and current ratings are not published here to prevent misapplication. Contact us with your system documentation for a verified compatibility check before ordering.

Solving the Discontinued Hardware Crisis

The Reliance AUTOMAX platform was widely deployed in heavy industrial environments—steel mills, paper mills, mining operations, and large-scale material handling systems—throughout the 1980s and 1990s. Reliance Electric was acquired by Rockwell Automation, and the AUTOMAX product line has been out of production for many years. Rockwell does not manufacture or supply 57C493 replacement units.

The power supply module is the backbone of the AUTOMAX control rack. Without a functioning 57C493, the entire drive system loses its regulated DC supply, rendering the processor, I/O modules, and communication cards inoperable. There is no direct modern equivalent that installs into the existing rack without hardware redesign.

The strategy is not complicated. Identify the modules with no available new-manufacture alternative. Secure verified spares while they remain accessible in the secondary market. Establish a documented inspection and rotation schedule. This approach has allowed facilities running AUTOMAX systems to defer multi-million dollar drive replacement projects while maintaining production reliability.

Condition & Reliability Assurance

DriveKNMS applies a 5-step inspection protocol to all obsolete power supply modules before they are offered for sale:

• Step 1 – Electrolytic Capacitor Assessment: All electrolytic capacitors are inspected for bulging, leakage, and ESR degradation. Capacitors showing age-related deterioration are flagged. Units with compromised capacitors are either recapped with equivalent-spec components or removed from inventory.
• Step 2 – Firmware & Label Verification: The firmware revision and hardware revision markings are cross-referenced against known AUTOMAX compatibility matrices to confirm the unit is the correct revision for the target application.
• Step 3 – Pin and Connector Inspection: All edge connectors and backplane pins are examined under magnification for oxidation, corrosion, and mechanical damage. Affected contacts are cleaned using approved non-residue methods.
• Step 4 – Functional Power-On Test: Where test fixtures are available, units are powered and output rails are measured against specification. Results are documented.
• Step 5 – Packaging and ESD Protection: Units are packaged in anti-static bags with desiccant and rigid outer packaging to prevent transit damage and moisture ingress during storage or shipping.

Key Features for System Maintenance

• Drop-in replacement: The 57C493 installs directly into the existing AUTOMAX control rack without mechanical modification.
• No reprogramming required: Replacing the power supply module does not affect the application program stored in the processor module. Control logic remains intact.
• No engineering redesign: Unlike a platform migration, a like-for-like module swap requires no involvement from a systems integrator and no revalidation of the control system.
• Immediate operational restoration: A verified spare on-site means mean time to repair is measured in minutes, not weeks.
• Asset life extension: Maintaining a spare 57C493 is the single most cost-effective action available to defer a full AUTOMAX system replacement.