NuTone C909 Tri-Volt Open Frame Doorbell Transformer

Get dependable, code-compliant low-voltage power for door chimes and access control systems with the Broan‑NuTone C909 Tri-Volt Open Frame Doorbell Transformer. Engineered for professional installers, this transformer reduces install time with a lock-mount or wall-mount footprint and supports tri-volt outputs so you can power one or multiple chimes without swapping units. With a 20VA power rating and standard 120V AC input, the C909 provides stable current to ensure consistent chime performance and fewer service calls. Safety features include a thermal cut-off switch that disables the unit under excessive temperature and cULus listing for easy inspection approval. Its compact open-frame form factor fits neatly in low-voltage closets, doorbell junctions and security control panels, making it ideal for door chime, access control and small surveillance/monitoring projects. Choose the Broan‑NuTone C909 when you need a durable, installer-friendly transformer that saves time and protects equipment — order today to streamline your next security or door chime deployment.

• Cuts installation time up to 25% with lock-mount or wall-mount design, lowering labor costs for installers
• Tri-volt selectable output supports common chime voltages so you can power single or multiple door chimes without extra parts
• 20VA rating with 120V AC input delivers stable low-voltage power for reliable door chime operation and fewer callbacks
• Built-in thermal cut-off protects the chime system from overheating for safer, long-term performance
• cULus Listed and compact open-frame design for easy integration into security, surveillance and monitoring installations