JB 521C23 KNX Dual-Channel Shutter Blind Actuator 2xAC 120V 6A UL NEMA Junction Box 5WG1521-4CB23

The JB 521C23 KNX shutter blind actuator is a two-channel AC 120 V controller designed for North American junction box installations. Each channel delivers 6 A rated contact current for resistive loads and utilizes two electrically interlocked relays to reverse motor direction.

• Integrated electronics detect limit switch actuation and automatically calibrate travel time for precise positioning
• Bus-powered electronics with integrated bus coupling units connect via bus terminal
• UL/NEMA junction box construction with 1/2 inch threaded connector for secure installation
• Communication objects enable movement to limit positions, step-by-step slat adjustment, and direct positioning by percentage values
• Supports automatic opening of slats to set positions and 1-bit/8-bit scene control with multiple scenes per channel
• Optional sunshine object enables automatic sunlight tracking with manual mode priority
• Alarm functions move blinds to safety positions in wind, rain, or frost conditions

• North American commercial blind control
• Office shading systems
• Hotel room automation
• Junction box sun protection