Shelly 1 Gen3 vs Shelly 2PM Gen4 comparison

Updated July 2026

Data from Amazon and official Shelly site.

2026 verdict

The Shelly 2PM Gen4 wins this smart relay comparison on breadth: it is a two-channel unit with a full safety suite (overheating, overvoltage, overcurrent and overpower protection), Zigbee added to Wi-Fi, Bluetooth and Matter, built-in per-channel energy monitoring and a cover/interlock mode for roller shutters, and it carries the higher owner rating. The single-channel Shelly 1 Gen3 answers with real strengths of its own: it is the more affordable module, it installs without a neutral wire (the 2PM needs one), and it keeps dry-contact and wet-contact modes for pulse-triggered projects. Both run locally without a hub for core control and work with Alexa, Google Home, Apple HomeKit, SmartThings and Home Assistant. Choose the Shelly 2PM Gen4 for two circuits, shutters, metering and full protection; choose the Shelly 1 Gen3 for cheap, no-neutral single-circuit retrofits.

Feature	Shelly 1 Gen3	Shelly 2PM Gen4	Winner
Price	$22.99	$38.99	Shelly 1 Gen3
Rating	4.5	4.6	Shelly 2PM Gen4
Safety	None	Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection	Shelly 2PM Gen4
Connectivity	Bluetooth	Bluetooth, Zigbee	Shelly 2PM Gen4
Relay Channels	1	2	Shelly 2PM Gen4
Energy Monitoring	NO	YES	Shelly 2PM Gen4
Dry Contact Mode	YES	NO	Shelly 1 Gen3
Wet Contact Mode	YES	NO	Shelly 1 Gen3
Zibgee Router	NO	YES	Shelly 2PM Gen4
Integrations	Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter	Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter	Tie
Power Off Memory	NO	NO	Tie

Shelly

Shelly 1 Gen3

$22.99

Buy on Amazon USA

+ Price: $22.99
+ Dry Contact Mode: YES
+ Wet Contact Mode: YES
- Rating: 4.5 vs 4.6
- Safety: None vs Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection

Winner

Shelly

Shelly 2PM Gen4

$38.99

Buy on Amazon USA

+ Rating: 4.6
+ Safety: Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection
+ Connectivity: Bluetooth, Zigbee
- Price: $38.99 vs $22.99
- Dry Contact Mode: NO vs YES

Frequently Asked Questions

Which is better overall: Shelly 1 Gen3 or Shelly 2PM Gen4?

The Shelly 2PM Gen4 is better overall thanks to its two channels, per-channel energy monitoring, full overheating/overvoltage/overcurrent/overpower protection, added Zigbee and cover mode, plus a higher owner rating. The Shelly 1 Gen3 is the pick when you only need one channel, want a no-neutral install or want to spend less.

What is the biggest difference between the Shelly 1 Gen3 and the Shelly 2PM Gen4?

Channel count and scope. The 2PM Gen4 controls two circuits, adds per-channel metering, a roller-shutter cover mode and a full protection suite, and requires a neutral wire. The Gen3 is a single-channel relay with no metering that installs without a neutral.

Can the Shelly 2PM Gen4 control roller shutters that the Shelly 1 Gen3 cannot?

Yes. The 2PM Gen4 has an interlock/cover mode with obstacle detection built for roller shutters, blinds and gates, driving a motor up and down from one module. The Shelly 1 Gen3 is a single-channel relay without cover mode, so it is not suited to that job.

Which relay works without a neutral wire?

Only the Shelly 1 Gen3. It runs in boxes that lack a neutral, unlike the Shelly 2PM Gen4, which requires a neutral wire at the install point and is best in homes with standard modern wiring.

Who should buy the Shelly 1 Gen3?

Buy the Shelly 1 Gen3 if you need one channel, have no neutral wire, or want the cheaper module. Its dry and wet contacts make it a flexible fit for garage doors, pumps and irrigation without energy monitoring.

Who should buy the Shelly 2PM Gen4?

Buy the Shelly 2PM Gen4 if you need to control two circuits or automate roller shutters, want per-channel energy monitoring, full protection and Zigbee flexibility, and your box has a neutral wire.

More Relays