The 45C-321 is a dedicated power supply module for Reliance AutoMate 30/40 series PLC systems. It provides power for the backplane as well as all CPU, I/O and communication modules. This model is discontinued. Only refurbished, surplus or NOS units are available for maintenance and replacement of legacy systems.

45C: Unified prefix for Reliance AutoMate 45C-series control components.321: Designates the high-power power supply module in this product line.No suffix: Represents the original hardware version. Models marked with A/B/C/D are revised versions with optimized circuits and heat dissipation.Hyphen: Standard writing format for industrial part numbers, which does not affect product performance and functions.

Input Voltage: Auto-adaptive 120 / 240 VAC.Output: Multiple DC outputs for backplane, including 24VDC with 20A peak current.Rated Power: Approximately 480W.Efficiency: Above 90% with power factor over 0.9.Operating Temperature: -10°C to +55°C.Dimensions: About 96.5×70.5×56.5 mm.Weight: Approximately 2.9 kg.Slot Occupation: Occupies 2 slots when installed on 45C31x series racks.Protection Features: Overvoltage, overcurrent, overheating and short circuit protection.

Module Installation: Side-loading design for standard AutoMate racks and fixed with screws.Backplane Connection: Edge connectors directly transmit power and timing signals to the backplane.Front Panel: Equipped with power switch, key lock and status indicators including PWR, OK and FAULT.Terminal Block: For AC input connection, grounding and auxiliary alarm contacts.

Converts 120/240VAC into stable multiple DC voltages required by the PLC backplane.Delivers 24VDC / 20A power to CPU, I/O and communication modules.Manages power-up sequence to ensure orderly system startup.Detects operational faults and triggers protection mechanisms. The FAULT indicator will light up when abnormalities occur.Monitors power status and communicates with the backplane for integrated system management.

Replacement and expansion of 2-slot power supply modules in legacy AutoMate 30/40 series PLC systems.Maintenance of traditional industrial systems including manufacturing lines, process control, water treatment, metallurgy and petrochemical industry.Applicable to high-density I/O racks such as 16-slot and 19-slot units that require high-current 24VDC power supply.Ideal for critical control circuits requiring high reliability and long continuous operation.

Installation: Cut off system power before inserting the module into two adjacent slots and tighten the fixing screws. Reserve enough space for ventilation.Wiring: Connect AC power cable and ground wire to the terminal block. Verify the selected input voltage matches the on-site power supply.Power-on Operation: Turn on the power switch. The PWR indicator lights up. After self-check, the OK indicator stays on and the FAULT indicator remains off.Routine Maintenance: Clean dust on fans and heat sinks every quarter. Check terminal tightness regularly and make sure edge connectors are free from oxidation.Safety Notes: Disconnect AC power and wait for complete discharge before disassembly or maintenance to prevent electric shock.