Schneider ACE949-2 2-wire RS485 Communication Interface

Overview

The Schneider ACE949-2 is a compact 2-wire RS485 interface module built for Sepam series 20, 40, 60, and 80 protection relays. It enables reliable Modbus RTU communication over E-LAN and S-LAN networks. With DIN rail mounting, robust construction, and wide temperature tolerance, it fits perfectly into industrial environments and SCADA systems.

Technical Specifications

Model

• ACE949-2

Function

• RS485 2-wire interface for Sepam 20/40/60/80 relays

• Supports Modbus RTU protocol over E-LAN and S-LAN

Communication

• Protocol: Modbus RTU

• Interface: RS485, 2-wire

• Line Termination: 150 Ω jumper-selectable

• Local Signaling: LED flashes during data transmission

Electrical Characteristics

• Rated Supply Voltage:

• 12 V DC ±10%

• 24 V DC ±10%

• Current Consumption:

• 16 mA (receiving mode)

• 40 mA max (sending mode)

Mounting

• Mounting Mode: Fixed

• Support: Symmetrical DIN rail

• Connection Type: Screw terminals (A/B lines + Earth)

• Earthing:

• Braid: 6–100 mm²

• Cable: 2.5 mm²

• Torque: 2.2 N·m

Mechanical Characteristics

• Dimensions (H × W × D): 88 × 72 × 30 mm

• Weight: 0.1 kg

Environmental Specifications

• Operating Temperature: –25°C to +70°C

• Protection Rating: IP20

Mechanical Robustness (IEC Standard Level 2)

• Earthquake Resistance:

• 1 Gn (vertical)

• 2 Gn (horizontal)

• Shock Resistance:

• 20 Gn / 16 ms (de-energized)

• 10 Gn / 11 ms (operating)

• Vibration Resistance:

• 2 Gn, 10–150 Hz (de-energized)

• 1 Gn, 10–150 Hz (operating)

Cable Distance

• Up to 1000 m depending on voltage, topology, and device count