Shelly 1PM Gen4 Wi-Fi Zigbee Matter Smart Relay Switch - Power

In this review the Shelly 1PM Gen4 is examined as a compact retrofit smart relay for homeowners and DIYers who want remote control plus energy visibility. The bottom line: it is best for people who need a small, behind-the-switch device that provides power metering alongside multi-protocol connectivity, because it pairs easily to a phone app and can be fitted in under 10 minutes without a hub. The device balances practical energy monitoring and simple automation with a footprint that fits most sockets and switches.

Key Features

• Multi-protocol connectivity: Built-in Wi-Fi, Zigbee and Matter support allows flexible integration with different smart home ecosystems without requiring a separate hub.
• Power metering: Real-time energy monitoring shows consumption for appliances such as water heaters and washing machines so users can spot energy hungry devices.
• Compact retrofit design: Small form factor fits behind most wall switches and sockets so installation is discreet and preserves existing wiring and plates.
• Bluetooth gateway: Acts as a gateway to enhance local Bluetooth connectivity for other devices and increase overall network reach.
• Fast setup and mobile control: Shelly Smart Control App enables configuration, scene creation and remote management with an advertised setup time under 10 minutes.

Who It's For

This product suits homeowners, renters with wiring access, and installers who want a single-channel relay that offers both switching and energy monitoring without buying a new hub. It is especially useful for controlling high-draw appliances on a schedule and for anyone who wants to identify and reduce energy waste.

It is less appropriate for users who require multi-channel relays in a single module or who prefer a device that includes an external dedicated hub out of the box. Users who need advanced wired integration with non-compatible legacy systems should verify compatibility before purchase.

Pros & Cons

Pros

• Accurate real-time energy monitoring helps identify inefficient appliances and reduce costs.
• Multiple connectivity options (Wi-Fi, Zigbee, Matter) provide flexible integration with voice assistants and smart platforms.
• Compact design allows discreet installation behind switches and sockets for retrofit projects.
• Quick setup through the Shelly app and the inclusion of a Bluetooth gateway improve usability and reach.

Cons

• Some customers report mixed experiences with advanced functionality, so power users may need patience tuning integrations.
• Single-channel 16A limit means it is not suitable for multi-circuit or very high current single appliances beyond its rating.

Specifications

Device type	1-channel smart relay switch
Connectivity	Wi-Fi, Zigbee, Matter, Bluetooth gateway
Load rating	16A per channel
Primary function	Remote switching and power metering
Installation	Compact, fits behind switches and sockets
App	Shelly Smart Control App for iOS and Android
Warranty	3 years device warranty

Our Verdict

The Shelly 1PM Gen4 is a practical, value-focused smart relay for anyone who wants on-device energy monitoring alongside flexible connectivity without a hub. It is a good buy for retrofit projects and appliance control where a single 16A channel is sufficient, offering dependable app control and helpful consumption insights at a competitive price.

Frequently Asked Questions

Does this need a hub?
No, the Shelly 1PM Gen4 can connect directly via Wi-Fi and supports Zigbee and Matter without requiring a separate hub for basic operation.

Can it measure appliance power?
Yes, it provides real-time power metering so users can monitor consumption of devices like heaters and washing machines.

Is installation difficult?
Installation is designed to be compact and to fit behind most switches in under 10 minutes, though users should follow safety precautions for wiring.