Description
The Shelly 1PM Gen4 is the newest evolution in Shelly’s flagship smart switch line, launched in early 2025. It represents a significant leap forward because it is no longer just a Wi-Fi/Bluetooth device – it is now a native multi-protocol powerhouse.
Get two at a discount.
The “4” signifies the fourth generation, which focuses on universal interoperability and significantly upgraded hardware.
What’s New in Gen4?
While the Gen3 was a solid upgrade, the Gen4 adds features that fundamentally change how it connects to your home:
- Zigbee 3.0 Support: This is the headline feature. For the first time, this relay can act as a Zigbee device or even a Zigbee repeater. You are no longer forced to use only Wi-Fi; you can now integrate it directly into Zigbee-based hubs like Home Assistant (via ZHA/Zigbee2MQTT) or Aeotec/SmartThings.
- Matter Native: It is built from the ground up to be Matter-certified, ensuring it works seamlessly across Apple Home, Google Home, and Amazon Alexa without needing specific “skills” or complicated workarounds.
- Upgraded Processor: It features the ESP-Shelly-C68F chip. This provides even more RAM (512 KB) and faster processing than the Gen3 chip, making the device’s local web interface and scripting faster.
- Wi-Fi 6 Support: It supports the 802.11ax (Wi-Fi 6) protocol, which improves stability and performance in homes with dozens of connected devices.
Technical Specifications
The physical dimensions remain the same as the Gen3, ensuring it still fits into standard wall boxes, but the internals have been beefed up.
| Feature | Shelly 1PM Gen4 |
| Max Current | 16A (Same as Gen3) |
| Connectivity | Zigbee 3.0, Matter |
| Processor | ESP-Shelly-C68F (512 KB RAM) |
| Power Monitoring | Yes (High-precision Voltmeter/Ammeter) |
| Power Supply | 110-240V AC / 24-30V DC |
| Flash Memory | 8MB |
Comparison: Gen3 vs. Gen4
If you are deciding between the two, here is the quick breakdown:
- Stick with Gen3 if: You only use Wi-Fi, you’re on a budget, and you don’t care about Zigbee. It’s still a very capable, modern device.
- Upgrade to Gen4 if: You want a “future-proof” home. If you want to move away from Wi-Fi congestion and utilize a Zigbee mesh, or if you want the easiest possible Matter setup, the Gen4 is the clear choice.
Summary of the “1PM” Lineup
Just to keep the names straight:
- Shelly 1PM Gen4: The full-size, 16A powerhouse with Zigbee/Wi-Fi/Matter.
- Shelly 1PM Mini Gen4: The tiny, 8A version for small boxes, also with Zigbee/Wi-Fi/Matter.
Important Reminder: Like all “PM” (Power Measurement) models, this device does not have dry contacts. It is a “wet contact” relay, meaning it outputs the same voltage it is powered with.
Note: Whilst the Shelly configuration is mostly DIY, any electrical work must be done by a registered electrical contractor and we recommend Straton Electrical.
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