Legrand Wattstopper LMBC-300-U DLM Wired Network Bridge – BACnet MS/TP Lighting Control (USA Version)

The Legrand Wattstopper LMBC-300-U is a wired network bridge module designed for use with Digital Lighting Management (DLM) systems. It connects local DLM room networks — including sensors, switches, and controllers — to a BACnet MS/TP segment network, enabling seamless integration with a Building Automation System (BAS).

This “-U” version is the USA-designated model, built to meet North American compliance standards while maintaining the same reliable performance and features as the standard LMBC-300. It allows facility managers, integrators, and building engineers to remotely monitor, configure, and control lighting systems from a centralized platform, making it ideal for commercial, industrial, and institutional buildings.

Key Features

• Bridges local DLM networks to a BACnet MS/TP segment network
• Enables centralized lighting control, monitoring, and scheduling
• USA version (-U) with UL and regional compliance labeling
• Class 2 powered – draws power directly from the DLM network (no external supply required)
• Dual RJ-45 ports for DLM local network connection
• Removable RS-485 terminal block for BACnet MS/TP integration
• Supports up to 40 local networks or ~340 devices over a linear topology up to 4,000 ft
• Compact, plenum-rated design for easy installation in junction boxes or DIN rails
• Compatible with a wide range of Legrand Wattstopper devices and BACnet controllers

Specifications

• Model: LMBC-300-U
• Manufacturer: Legrand / Wattstopper
• Type: DLM Wired Network Bridge (USA Version)
• Power: 24 V DC (from DLM local network)
• Current Draw: ~30 mA
• Local Network Ports: 2 × RJ-45
• Segment Network: RS-485 (BACnet MS/TP)
• Topology: Linear, up to 4,000 ft
• Capacity: ~40 local networks / ~340 devices
• Operating Temperature: 32°F to 158°F (0°C to 70°C)
• Humidity: 0–95% RH, non-condensing
• Mounting: DIN rail, junction box, or plenum-rated enclosure
• Certifications: UL 2043, RoHS compliant

Applications

• Building automation and BACnet lighting control integration
• Centralized lighting and energy management systems
• Large commercial, industrial, or institutional facilities
• Expansion of existing DLM networks into BACnet BAS environments