1. General Information

• Part Number: 57401 (0-57401, 57401-1, 57401-2)

• Manufacturer: Reliance Electric (Rockwell Automation)

• Series: AutoMax PLC / Distributed Control System

• Type: 16‑Point 120/240 VAC Digital Output Module

• Application: Industrial automation, drive control, relay/contactor/solenoid switching

• Status: Obsolete (discontinued); refurbished/surplus available

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

2. Electrical Specifications

• Output Voltage (Nominal): 120 VAC / 240 VAC

• Max Switching Voltage: 264 VAC

• Number of Channels: 16 isolated outputs

• Output Device: Triac (AC)

• Rated Current per Channel: 3 A (resistive load)

• Backplane Supply: +5 VDC, ±12 VDC

• Power Dissipation: ≤ 10 W

• Isolation: Opto‑isolated per channel (field ↔ logic)

• Off‑State Leakage Current: ≤ 1 mA

• Response Time: ≤ 15 ms (typical)

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

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. 0.91 kg (2.0 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 outputs, 120/240 VAC

• 3 A per channel, suitable for inductive and resistive loads

• Opto‑isolation and triac snubbers for noise immunity

• Per‑channel status LEDs for diagnostics

• Hot‑swap capable (replace without system shutdown)

• Fully compatible with AutoMax racks and drives

6. Compatibility

• Racks: All AutoMax series racks and backplanes

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

• Replacement: 57401‑1 / 57401‑2 interchangeable with 0-57401