1. Shelly 1 PM Gen4: Power Monitoring Meets High-Voltage Control

The Shelly 1 PM Gen4 is a 16-amp smart relay with integrated power monitoring, ideal for controlling high-demand devices like lighting circuits, outlets, or 120V appliances. This model is particularly useful for users who want real-time insights into energy consumption without needing to install separate sensors.

Key Features:

• 16A load support – Suitable for controlling larger appliances and power circuits.
• Power monitoring – Track usage over time to identify energy-saving opportunities.
• Multi-protocol support – Works over Wi-Fi, Bluetooth, Zigbee, and Matter.

How It Works:
Install it behind a wall switch, inside a junction box, or within the wiring setup of an appliance. Once connected, users can toggle power manually or automate it based on schedules, occupancy, or environmental conditions using the Shelly app or third-party ecosystems, such as Google Home or Alexa.

2. Shelly 1 Gen4: The Versatile Dry Contact Relay

The Shelly 1 Gen4 is a 16A dry contact relay—perfect for integrating legacy systems or low-voltage circuits into a smart setup. It’s especially useful for gate openers, garage doors, sprinkler systems, or HVAC controls.

Key Features:

• Dry contact support – Allows use with both low- and high-voltage systems.
• Manual switch control – Compatible with existing wall switches.
• Supports multi-platform automation – Use it in routines or scenes with Alexa, Google Assistant, or Apple HomeKit.

How It Works:

Wire it inline with the device or system you wish to control. Whether it's opening a gate or turning on a pump, Shelly 1 Gen4 lets you manage it through your smartphone or automate it through your favorite smart assistant.

3. Shelly 1 PM Mini Gen4: Tiny Relay, Big Capabilities

Claiming the title of the world’s smallest smart relay with power monitoring, the Shelly 1 PM Mini Gen4 is compact yet powerful. Supporting up to 8A, it’s best suited for smaller loads like desk lamps, fans, or under-cabinet lighting.

Key Features:

• Ultra-compact design – Fits into tight electrical boxes or fixtures.
• 8A max load – Ideal for light-duty appliances.
• Real-time power metering – Track how much energy smaller devices are consuming.

How It Works:
Install it behind a switch or directly within a device enclosure. Despite its size, it retains all the automation and scheduling capabilities of the full-sized models—plus multi-protocol support, making it future-proof out of the box.

4. Shelly 1 Mini Gen4: Smallest Dry Contact Smart Relay

The Shelly 1 Mini Gen4 mirrors the same compact design as its PM sibling but focuses on dry contact functionality. This makes it ideal for users looking to control contactors, switches, or low-voltage automation systems with limited space.

Key Features:

• Dry contact capability – Works with wide range of voltages and systems.
• 8A max load – Still powerful enough for many home use cases.
• Versatile mounting options – Easily fits behind wall plates or within enclosures.

How It Works:
Perfect for integrating into space-constrained installations like appliance panels or smart furniture, this relay enables control and automation of niche applications that might otherwise be difficult to smarten up.