Functional Devices RIBTWX2401B-BC BACnet MS/TP Network Relay Device 20A SPDT with Current Sensor

The Functional Devices RIBTWX2401B-BC is a BACnet MS/TP open-protocol network relay device designed for HVAC, building automation, and energy management applications. This enclosed relay integrates seamlessly into BACnet networks, allowing remote on/off control and real-time status feedback without requiring a larger, more expensive controller.

The relay is powered locally and communicates over a twisted pair of wires using standard BACnet objects, enabling command and status reporting across the network. A built-in current sensor provides load-sensing capability, while a dry contact digital input delivers additional feedback from external devices.

Key Features:

• BACnet MS/TP Protocol: Open-protocol network compatibility for seamless BAS integration
• One Binary Output (BO): 20-amp SPDT relay contact for controlling loads up to 20A
• Two Binary Inputs (BI): One fixed current sensor (0.25–20A sensing range) for load monitoring, plus one dry contact digital input
• Dual Power Input: Accepts 24 Vac/dc or 120 Vac for flexible installation
• DIP Switch Override: Manual control override switch for commissioning and troubleshooting
• LED Status Indicator: Visual relay status feedback — illuminates when relay is activated
• 16" Wire Leads: Pre-wired for fast, convenient installation
• NEMA 1 Enclosed Housing: Plenum-rated enclosure with 1/2" and 3/4" NPT conduit hubs
• Optional End-of-Line Resistor: Included for network termination flexibility
• Fast Operate Time: 18 ms relay operate time
• Rated Relay Life: 10 million cycles minimum mechanical life
• Operating Temperature: -30°F to 140°F (-34°C to 60°C)
• Operating Humidity: 5% to 95% non-condensing
• Approvals: UL Listed (UL 916 Energy Management, UL 864 Fire), cUL Listed, CE, RoHS, CSFM
• Country of Origin: USA

The RIBTWX2401B-BC is part of Functional Devices' RIB® (Relay in a Box) Intelligent Field Devices line. The pre-mounted, pre-wired design eliminates the need to source and assemble separate relay, socket, mounting rail, and enclosure components, saving significant time and labor on installation. This device is ideal for distributed control point applications in commercial HVAC, lighting, and building automation systems.