The SHELLY Plus Add-on is a universal sensor interface for extending the functionality of your SHELLY Plus devices. Thanks to galvanic isolation, you gain a higher level of safety, noise immunity, and stable data acquisition from sensors. The compact design fits into a wall box, electrical panel, and other space-constrained locations.

The module is designed for quick integration into an existing installation and lets you easily add sensor inputs for control and automation. VCC and VREF outputs are available to power sensors and provide reference according to specification, while power consumption is less than 0.5 W for efficient operation.

• Galvanically isolated interface for safe and stable data acquisition
• Compact 37 × 42 × 15 mm size for easy installation
• Wide compatibility with SHELLY Plus devices (1 / 1PM, 2PM, i4 / i4DC)
• 3.3 V supply, very low power consumption < 0.5 W
• Resilient under typical environmental conditions: -20 °C to 40 °C, 30–70% RH

With these features, the SHELLY Plus Add-on is an excellent choice for expanding automation, collecting status information, and precise control of your smart home.