Shelly 1 Gen4 vs Shelly 2PM Gen4 comparison

Updated July 2026

Data from Amazon and official Shelly site.

2026 verdict

The Shelly 2PM Gen4 wins this in-family comparison against the Shelly 1 Gen4, switching two independent circuits instead of one, rating marginally higher, adding energy monitoring, and backing it with overvoltage, overcurrent and overpower protection on top of the overheating protection both share. In a wall box that controls two loads, one 2PM replaces two separate modules and reports what each one draws. The Shelly 1 Gen4 answers on cost and wiring flexibility: it is considerably cheaper, and it is the only one of the pair with dry-contact and wet-contact modes, which is what makes it suitable for pulse-triggered gear, gate controllers, boilers and low-voltage circuits where a plain mains-switching relay will not do. Choose the Shelly 1 Gen4 for a single circuit, a tight budget or dry-contact wiring, and the Shelly 2PM Gen4 for two channels, per-channel metering and the fuller protection set.

Feature	Shelly 1 Gen4	Shelly 2PM Gen4	Winner
Price	$24.99	$38.99	Shelly 1 Gen4
Rating	4.4	4.6	Shelly 2PM Gen4
Safety	Overheating protection	Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection	Shelly 2PM Gen4
Relay Channels	1	2	Shelly 2PM Gen4
Energy Monitoring	NO	YES	Shelly 2PM Gen4
Dry Contact Mode	YES	NO	Shelly 1 Gen4
Wet Contact Mode	YES	NO	Shelly 1 Gen4
Warranty	3 years	3 years	Tie
Connectivity	Bluetooth, Zigbee	Bluetooth, Zigbee	Tie
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
Zibgee Router	YES	YES	Tie

Shelly

Shelly 1 Gen4

$24.99

Buy on Amazon USA

+ Price: $24.99
+ Dry Contact Mode: YES
+ Wet Contact Mode: YES
- Rating: 4.4 vs 4.6
- Safety: Overheating protection 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
+ Relay Channels: 2
- Price: $38.99 vs $24.99
- Dry Contact Mode: NO vs YES

Frequently Asked Questions

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

The Shelly 2PM Gen4, which switches two circuits, adds energy monitoring and includes overvoltage, overcurrent and overpower protection, with a slightly stronger rating. The Shelly 1 Gen4 costs less and is the only one with dry-contact and wet-contact modes.

What is the biggest difference between the two?

The Shelly 2PM Gen4 has two relay channels and per-channel energy monitoring, while the Shelly 1 Gen4 has one channel and no metering but supports dry-contact and wet-contact wiring.

Which one should I pick for a boiler or a gate?

The Shelly 1 Gen4, because dry-contact mode gives a voltage-free switch, which is what most boilers, gate controllers and low-voltage inputs expect. The Shelly 2PM Gen4 does not list that mode.

Which one measures energy use?

The Shelly 2PM Gen4, reporting consumption on each of its two channels. The Shelly 1 Gen4 switches without metering.

Which one has better electrical protection?

The Shelly 2PM Gen4, adding overvoltage, overcurrent and overpower protection to the overheating protection both provide.

Who should buy the Shelly 1 Gen4?

Anyone controlling a single circuit at the lowest cost, or who needs dry-contact or wet-contact wiring for pulse triggers, a boiler or low-voltage equipment.

Who should buy the Shelly 2PM Gen4?

Anyone with two loads in one backbox who wants both switched and metered independently, with the most complete set of electrical protections.

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