• Part Number: 57300 (also 0-57300)

• Manufacturer: Reliance Electric (Rockwell Automation)

• Product Type: Field Power Interface PCB Module

• Application: Legacy DC drive systems (FlexPak / CardPak), field power signal conditioning & interface

• Status: Obsolete (discontinued); refurbished/surplus available

• Mounting: 6-hole panel mount, plug-in edge connector

Electrical Specifications

• Input Voltage: 120/240 VAC (field power)

• Output Voltage: Isolated control signals, ±15 VDC, 24 VDC

• Channel Configuration: 8 isolated transformer channels

• Isolation: Transformer + opto-isolation (field-to-logic)

• Connectors:

  • 25-pin female (I/O)

  • 9-pin female (aux power)

• Key Components: 8 transformers, varistors, diodes, resistors, capacitors, 12 ICs

Mechanical Characteristics

• Form Factor: Standard plug-in PCB

• Dimensions (approx): 220 × 180 × 30 mm (8.7 × 7.1 × 1.2 in)

• Weight: ~0.8 kg (1.8 lbs)

• Mounting: 6-hole chassis mount

• Coating: Conformal coated (moisture/dust resistance)

Environmental Ratings

• Operating Temp: 0°C to +55°C

• Storage Temp: -20°C to +70°C

• Humidity: 10%–90% RH, non-condensing

Key Functions

1. Field Power Isolation: Isolates high-voltage field circuits from low-voltage logic

2. Signal Conditioning: Conditions drive enable, fault, and feedback signals

3. Voltage Conversion: Steps down/isolates AC field power to DC control levels

4. Fault Protection: Varistor/RC surge suppression, overvoltage protection

Compatibility

• Drive Series: FlexPak 3000, FlexPak Plus, CardPak DC drives

• Direct Replacement: Matches original 0-57300; no wiring changes required