1. General Information

• Manufacturer: Reliance Electric (Rockwell Automation / Baldor-Reliance)

• Part Number: 0-51375 (0-51375-2, 0513752)

• Description: Sequencing Board / Relay Control PCB

• Application: Reliance drive systems (legacy DC/AC drives, AutoMax, etc.)

• Condition: New / Used / Remanufactured

• Warranty: 6–12 months (supplier dependent)

2. Electrical Specifications

• Logic Supply: +5 VDC (from system power supply)

• Relay Ratings:

  • Contact Rating: 5 A @ 120/240 VAC (resistive)

  • Coil Voltage: 24 VDC / 120 VAC (model-dependent)

• Control Signals: TTL-level I/O, isolated relay outputs

• Insulation: Basic isolation between logic and relay circuits

3. Physical & Environmental

• Dimensions (W×H×D): ~220 mm × 120 mm × 30 mm (8.7" × 4.7" × 1.2")

• Weight: ~0.45 kg (1.0 lb)

• Construction: Standard industrial PCB, conformal coated

• Operating Temperature: 0°C to +50°C (32°F to 122°F)

• Storage Temperature: -20°C to +70°C (-4°F to 158°F)

• Humidity: 5%–95% RH (non-condensing)

4. Function & Features

• Drive Sequencing: Manages start/stop, interlocks, and timing logic

• Relay Outputs: Controls external contactors, brakes, alarms, and auxiliary devices

• System Interfacing: Connects to drive control logic and peripheral I/O

• Fail-Safe Design: Ensures safe shutdown on fault conditions

• Legacy Replacement: Direct OEM replacement for older Reliance drive systems

5. Compatibility

• Reliance DC Drives: RPM III, DCV, etc.

• Reliance AC Drives: GV3000, SP500 (legacy configurations)

• AutoMax Systems: For sequencing and relay control racks