Shelly 1PM Gen4 vs Shelly 2PM Gen4 comparison

Updated July 2026

Data from Amazon and official Shelly site.

2026 verdict

One channel or two? The Shelly 1PM Gen4 wins this smart relay comparison as the more affordable option, and it confirms both dry-contact and wet-contact modes for pulse-style triggers and versatile wiring. Both are Gen4 relays sharing 16A ratings, built-in energy monitoring, Wi-Fi, Bluetooth, Zigbee, Matter, a Zigbee router role and support for Alexa, Google Home, Apple HomeKit, SmartThings and Home Assistant, so they are closely related. The Shelly 2PM Gen4 justifies its higher price with a second channel, a complete four-way safety suite (overheating, overvoltage, overcurrent, overpower) and an interlock/cover mode for roller shutters and blinds. Choose the 1PM Gen4 to monitor and control a single circuit for less; step up to the 2PM Gen4 when you need two channels or shutter automation.

Feature	Shelly 1PM Gen4	Shelly 2PM Gen4	Winner
Price	$28.99	$38.99	Shelly 1PM Gen4
Safety	None	Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection	Shelly 2PM Gen4
Relay Channels	1	2	Shelly 2PM Gen4
Dry Contact Mode	YES	NO	Shelly 1PM Gen4
Wet Contact Mode	YES	NO	Shelly 1PM Gen4
Rating	4.6	4.6	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
Energy Monitoring	YES	YES	Tie
Power Off Memory	NO	NO	Tie
Zibgee Router	YES	YES	Tie

Winner

Shelly

Shelly 1PM Gen4

$28.99

Buy on Amazon USA

+ Price: $28.99
+ Dry Contact Mode: YES
+ Wet Contact Mode: YES
- Safety: None vs Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection
- Relay Channels: 1 vs 2

Shelly

Shelly 2PM Gen4

$38.99

Buy on Amazon USA

+ Safety: Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection
+ Relay Channels: 2
- Price: $38.99 vs $28.99
- Dry Contact Mode: NO vs YES

Frequently Asked Questions

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

The Shelly 1PM Gen4 wins on value and keeps confirmed dry and wet contact modes, making it the pick for a single monitored circuit. The Shelly 2PM Gen4 is the better buy only if you need a second channel, roller-shutter cover mode or its fuller safety-protection suite.

What is the main difference between these two Gen4 relays?

Channel count and role. The 2PM Gen4 controls two circuits and adds interlock/cover mode for shutters and a four-way safety suite, while the 1PM Gen4 is a single-channel module. Both share 16A, energy monitoring and the same multi-protocol radios.

Do both include energy monitoring and Matter?

Yes. Both the Shelly 1PM Gen4 and Shelly 2PM Gen4 have built-in power metering, support Matter, act as a Zigbee router, and work with Alexa, Google Home, Apple HomeKit, SmartThings and Home Assistant. The 2PM simply meters two channels instead of one.

Who should buy the Shelly 1PM Gen4?

Buy the Shelly 1PM Gen4 if you want to monitor and control one circuit, such as a water heater or boiler, at a lower price, and you value its confirmed dry and wet contact modes for flexible wiring.

Who should buy the Shelly 2PM Gen4?

Buy the Shelly 2PM Gen4 if you need to control two circuits, automate roller shutters or blinds with cover mode, or want its complete four-way safety protection. It is the choice for dual-circuit and shutter setups.

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