1. General Information

• Part Number: 57402 (0-57402, 57402-C, 57402-E, 57C402)

• Manufacturer: Reliance Electric (Rockwell Automation)

• Series: AutoMax PLC / Distributed Control System

• Type: 16‑Point 115V AC/DC Low Power Output Module

• Application: Low‑power relays, solenoids, contactors, general ON/OFF control

• Status: Obsolete (discontinued); refurbished/surplus available

• Mounting: AutoMax rack‑mount, plug‑in backplane

2. Electrical Specifications

• Output Voltage (Nominal): 115 VAC / 24 VDC

• Max Operating Voltage: 132 VAC RMS

• Number of Channels: 16 isolated outputs

• Output Type: Solid‑state (AC/DC low‑power)

• Rated Current per Channel: 200 mA continuous (1 A peak)

• Max Leakage Current: ≤ 1 mA (off‑state)

• Isolation: 2500 V between outputs and logic common; 4 outputs per isolated common (4 groups × 4 channels)

• Backplane Supply: +5 VDC, ±12 VDC

• Power Dissipation: ≤ 8 W

• Status Indicators: LED per channel (ON/OFF)

• Protection: Reverse polarity, overcurrent, short‑circuit

3. Mechanical Characteristics

• Form Factor: Standard AutoMax plug‑in module

• Dimensions (W × D × H): 31.8 × 187.3 × 38.1 mm (1.25 × 7.375 × 1.5 in)

• Weight: Approx. 0.86 kg (1.9 lbs)

• Connection: Rear gold‑finger edge connector (backplane); front screw terminal block

• Coating: Conformal coated (moisture/dust resistance)

4. Environmental Ratings

• Operating Temperature: 0 °C to +55 °C

• Storage Temperature: -20 °C to +70 °C

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

• Altitude: Up to 3,000 m (10,000 ft)

• Certifications: UL, CSA, CE (original standards)

5. Key Features

• 16‑channel isolated AC/DC outputs, 115 VAC / 24 VDC

• Low‑power 200 mA continuous rating for small loads

• 2500 V isolation between field and logic; 4 isolated common groups

• Per‑channel status LEDs for quick diagnostics

• Hot‑swap capable (replace without system shutdown)

• Compact, rugged design for industrial environments

6. Compatibility

• Racks: All AutoMax series racks and backplanes

• Drives: FlexPak, CardPak, PMI DC/AC drives

• Replacement: 57402‑C / 57402‑E / 57C402 fully interchangeable with 0-57402