Description
The RELIANCE ELECTRIC 57C493 (57493A) 376W Power Supply Module is a power supply unit designed for the AutoMax PLC and industrial control rack systems. It converts 115/120 VAC input power into the regulated DC voltages required by AutoMax processor modules, I/O modules, and other rack-mounted control components.
The 57C493 is a three-slot power supply module capable of providing up to 376 watts of continuous output power. It is commonly installed in AutoMax and DCS 5000 control racks where stable DC power distribution is required for industrial automation applications.
This power supply features rack-level power conversion, protection functions, memory protection switch operation, and fault indication for easier maintenance in legacy PLC control systems. It is widely used as a replacement spare part for existing Reliance Electric automation installations.
57C493
🔹 Product Parameters
| Parameter | Value |
|---|---|
| Brand | RELIANCE ELECTRIC |
| Model | 57C493 / 57493A |
| Series | AutoMax Power Supply Series |
| Product Name | 376W Power Supply Module |
| Application | AutoMax PLC Rack Power Supply |
| Product Status | New Surplus / New Open Box / Used Available |
| Dimensions | Approx. Rack Mount Industrial Module Size |
| Weight | Approx. 3–5 kg |
| Origin / Place of Origin | United States |
| Input Power | 100–132 VAC, 50/60 Hz (Nominal 120 VAC) |
| Output Power | 376 W Continuous Output |
| Output Voltage | ±5 VDC, ±15 VDC, ±12 VDC |
| Mounting Type | AutoMax Rack Mounted Module |
| Discontinued | Legacy Product, Manufacturer Support Limited |
🔹 Common Questions & Answers (Q&A)
Q: What is the main function of the RELIANCE ELECTRIC 57C493?
A: The 57C493 provides DC power conversion for AutoMax PLC racks, supplying the required voltages for processors, communication modules, and I/O modules.
Q: Which systems use the 57C493 power supply?
A: It is mainly used in Reliance Electric AutoMax and DCS 5000 industrial automation systems.
Q: What are common failure symptoms of a faulty 57C493?
A: Typical problems include rack power loss, PLC module shutdown, fault indicator activation, unstable DC output voltage, or inability to start the control system.
Q: Can the 57C493 replace other Reliance power supplies?
A: Replacement depends on rack type, module power requirements, output specifications, and installation configuration. The existing part number should be verified before replacement.
Q: Does the 57C493 include protection functions?
A: Yes. The module includes power monitoring and fault indication features to assist troubleshooting and maintenance.
Q: Is the 57C493 still manufactured?
A: The 57C493 is considered a legacy AutoMax component, and available units are typically supplied from surplus, refurbished, or replacement inventories.
🔹 Recommended RELIANCE ELECTRIC Models
- RELIANCE ELECTRIC 57C493 – AutoMax 376W Power Supply Module
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- RELIANCE ELECTRIC 61C599 – Rack Blank Filler Plate
