The Shelly 1PM Mini Gen4 brings powerful smart control to tight spaces, combining an 8A smart relay switch with precise power metering in a tiny package. This compact device fits behind light switches, sockets, or in wall boxes, letting you monitor and manage energy use for lights, fans, and appliances remotely. Perfect for home automation enthusiasts, the Shelly 1PM Mini Gen4 tracks consumption with 1% accuracy, stores data locally and in the cloud, and supports multiple protocols for seamless integration. Whether you're cutting bills or building a smart home, this relay delivers reliability without bulk.
Product Overview
The Shelly 1PM Mini Gen4 smart relay switch stands out as a multiprotocol powerhouse. It measures power draw in real time, helping you see exactly how much energy your devices use. Its small size- just 34 x 29 x 16 mm and 18 grams-makes it ideal for retrofitting into standard electrical boxes where space is limited. Key highlights include Wi-Fi 6, Bluetooth 5.0, Zigbee, and Matter compatibility, all powered by an upgraded ESP-Shelly-C68F processor with 8MB flash. You get local control via an embedded web interface, plus cloud access for remote operation from anywhere. An internal temperature sensor adds extra monitoring, and features like scripting, MQTT, schedules (up to 20), and webhooks (20 with 5 URLs each) enable advanced automation. This Gen4 model improves on predecessors with faster response, better memory for scripts, and multi-protocol support for future-proof installations. It's rated for 110-240V AC, handles up to 8A (2000W at 240V AC or 150W at 30V DC), and works in 30-70% RH environments up to 2000m altitude.
Technical Specifications
Built for durability and precision, the Shelly 1PM Mini Gen4 uses a dry NO contact, 1-pole micro relay with screw terminals (0.5-4 mm² conductors, 0.4 Nm torque). Power supply is 110-240V~ at 50/60Hz, with consumption under 1.2W.
Wireless specs shine: Wi-Fi (802.11 b/g/n/ax, 2412-2472 MHz, <20 dBm, up to 30m indoor/50m outdoor); Bluetooth 5.0 (2402-2480 MHz, <4 dBm, 10m/30m); Zigbee (802.15.4, 2400-2483.5 MHz, <20 dBm, 100m/300m). External protection requires a B or C curve breaker (max 10A, min 6kA interrupt). Here's a quick spec list:
- CPU: ESP-Shelly-C68F (ESP32-C6 based RISC-V)
- Memory: 8MB flash
- Max load: 8A/240V AC (2000W), 5A/30V DC (150W)
- Sensors: Internal temperature
- Operating temp: -20°C to 40°C
- Humidity: 30% to 70% RH (non-condensing)
These details ensure the device meets standards like FCC and CE for safe, reliable use.
Connectivity & Integration
Seamless connectivity defines the Shelly 1PM Mini Gen4. Native Matter support means it works with Apple HomeKit, Google Home, Alexa, and SmartThings out of the box-no hubs needed for basics. Zigbee extends range via meshes, while Wi-Fi and Bluetooth enable direct app control via the Shelly app.
For tinkerers, MQTT, HTTP webhooks, and scripting (JavaScript-like) allow custom logic, like auto-shutoff on high power draw. Integrate with Home Assistant or open-source platforms using the local API. Cloud syncing provides energy graphs and alerts, with ranges up to 100m indoors for Zigbee. No batteries required-it draws power from the line. Pairing takes minutes: scan QR code or use Bluetooth provisioning. This multi-protocol approach future-proofs your energy efficiency goals in mixed ecosystems.
Use Cases
The Shelly 1PM Mini Gen4 excels in everyday smart home scenarios, turning ordinary circuits into intelligent ones. Monitor and control hidden loads like under-cabinet lights or exhaust fans without visible hardware.
Practical applications include:
- Energy monitoring for holiday lights or chargers to spot vampires and save on bills.
- Automating pool pumps or heaters with schedules and power thresholds.
- Behind-wall control for garage doors or irrigation valves via voice commands.
- Temperature-based fans in server rooms or grow tents using the built-in sensor.
- Multi-device dashboards tracking whole-home energy savings via cloud data.
In rentals or retrofits, its tiny size hides easily, adding convenience without remodeling.
Setup & Getting Started
Getting your Shelly 1PM Mini Gen4 online is straightforward, under 10 minutes for most. Always power off the circuit first.
- Wire to live/neutral and load (consult manual for diagrams-L, N, O terminals).2. Power on; LED blinks for setup mode.
- Download Shelly app (iOS/Android), connect via Bluetooth or Wi-Fi (2.4GHz only).
- Scan QR or enter ID; firmware updates automatically.
- Add to Matter/Zigbee hubs if needed, or configure MQTT/scripts via web UI (join 192.168.33.1).
Test relay toggle and power readings. Use schedules for timed operation or link to sensors. Pro tip: Enable over-power protection to avoid trips. Full docs in the app or knowledge base cover troubleshooting.
Advanced Features and Customization
Beyond basics, the Shelly 1PM Mini Gen4 supports 20 schedules and webhooks for IFTTT or custom servers. Scripting lets you code rules like "if temp >30°C and power >50W, turn off." Export energy data to spreadsheets for analysis, promoting green living.
Machine learning isn't onboard, but cloud analytics predict usage patterns. Pair with Shelly sensors for full rooms via Zigbee mesh.
Final Thoughts
The Shelly 1PM Mini Gen4 smart relay switch transforms tight spaces into smart hubs with unmatched energy efficiency and control. At 4.7 stars from 1250+ reviews, it's praised for accuracy, size, and protocol support-ideal for DIYers expanding home automation without clutter.
If you need precise power metering in walls or IoT device integration, this is your pick. Pair multiples for whole-home insights and watch savings grow.