Doorbell transformer 230/8-12VAC 8VA ST303

Doorbell Transformer – Reliable Power Supply for Your System

This compact Hager ST303 doorbell transformer is the ideal solution for powering home doorbell systems and similar applications. It provides a stable output voltage of 8V or 12V AC, allowing for flexible adaptation to different devices. Its robust construction and built-in protections guarantee safe and long-lasting operation.

The transformer is particularly valued for its modularity – it occupies only 2 modules on a DIN rail, which simplifies installation in electrical panels. This saves space and time during installation. Therefore, it will work well both in new installations and when modernizing existing systems.

Functionality and Safety in One

The device is characterized by high reliability thanks to the built-in thermal and short-circuit protection. This means that the transformer will automatically switch off in the event of overheating or a short circuit, protecting both the installation itself and the connected devices. A primary voltage of 230V ensures compatibility with most standard electrical networks.

• Two output voltages: 8V AC (1A) and 12V AC (0.67A) – ability to power different types of doorbells.
• Modular design: occupies only 2 modules on a DIN rail – easy installation and space saving.
• Built-in protections: thermal and short-circuit protection ensure safe use.
• Maximum output power: 8VA (8W) – sufficient for most standard applications.
• Width: 35 mm – compact dimensions facilitate installation in tight spaces.
• Surface mounting: allows for flexible choice of installation location.
• Compliance with standards: ensures safe and compliant electrical installation.

The ST303 transformer has been designed with the needs of professional installers in mind. Its solid construction, high quality workmanship and compliance with applicable standards guarantee trouble-free installation and long-term operation. The maximum output current is 1000A (this value refers to the parameters of the transformer's C characteristic, and not the actual output current), which provides a power reserve for devices with high energy demand during startup (e.g. motors). The length of the transformer is 111 mm and the height is 65 mm, which makes it easy to fit into different electrical panels. The maximum power loss is 2.2 W, which translates to efficient use of electrical energy.