Shelly 2PM Gen4 2-Channel Relay vs Shelly 1 Gen4 Smart Relay: Spec Comparison
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You are comparing the shelly 2pm gen4 2 channel relay vs 1 gen4 smart relay. Both devices offer Wi-Fi, Zigbee, and Matter connectivity without requiring a hub. They share identical physical dimensions and maximum load ratings. The main difference lies in their channel count and specific control features. The Shelly 2PM Gen4 provides two channels with power metering, while the Shelly 1 Gen4 offers a single channel with dry contact support. This distinction affects how you wire and monitor your home appliances.
Key differences
| Aspect | Shelly 2PM Gen4 2-Channel Relay | Shelly 1 Gen4 Smart Relay Switch |
|---|---|---|
| Channels | 2 channels | 1 channel |
| Power Metering | Built-in power metering | Not listed |
| Special Features | Bi-directional motor support | Dry contacts |
| Connectivity | Wi-Fi, Zigbee, Bluetooth | Wi-Fi, Zigbee, Bluetooth |
| Warranty | Not listed | 3 years device warranty |
Which one should you choose?
Choose Shelly 2PM Gen4 2-Channel Relay if
- You need to control two separate devices independently from one unit.
- You want to monitor the energy consumption of your appliances in real time.
- You are installing automated curtains or bi-directional motors.
Choose Shelly 1 Gen4 Smart Relay Switch if
- You require dry contacts for specific low-voltage switching applications.
- You are automating a garage door or similar single-device setup.
- You prefer a device with a stated three-year warranty.
Verdict: Choose the Shelly 2PM Gen4 if you need dual-channel control and energy monitoring for multiple appliances. Select the Shelly 1 Gen4 if you only need to manage one device and benefit from dry contact functionality or the included warranty. Both options provide robust smart home integration without a hub.
Shelly 2PM Gen4 vs 1 Gen4 Specs
Channel Count
The Shelly 2PM Gen4 offers two independent channels, allowing you to control two separate loads like lights or appliances on a single phase. This setup lets you manage each circuit individually. The Shelly 1 Gen4 provides only one 16A channel. It is designed for single-load applications. If you need to control multiple devices from one unit, the 2PM Gen4 is the practical choice. The 1 Gen4 is sufficient for simpler, single-circuit setups. You must choose based on the number of independent loads you intend to manage.
Energy Monitoring
The Shelly 2PM Gen4 includes built-in power metering. This feature allows you to monitor energy consumption for each of its two channels separately. You can track usage for optimal efficiency. The Shelly 1 Gen4 does not list power metering capabilities in its specifications. It focuses on relay switching and dry contacts. If tracking electricity usage is important for your home automation goals, the 2PM Gen4 provides this data. The 1 Gen4 lacks this specific metric in the provided data.
Switch Function Type
The Shelly 1 Gen4 features dry contacts. This specification enables it to interface with external systems like garage door openers or low-voltage switches. It supports integration with Reed switches for status monitoring. The Shelly 2PM Gen4 is described as a smart switch relay without explicit mention of dry contacts in its key specs. It focuses on direct control of home appliances and bi-directional motors. The dry contact capability of the 1 Gen4 makes it more versatile for specific industrial or automation triggers.
Physical Dimensions
Both devices share identical physical measurements. The Shelly 2PM Gen4 and the Shelly 1 Gen4 both measure 1.65 inches in width, 1.46 inches in height, and 0.63 inches in length. They also weigh the same at 0.92 ounces. This consistency means they will fit into standard electrical wall boxes and tight spaces equally well. You do not need to adjust your installation space based on which model you select. The footprint is the same for both units.
Connectivity Protocols
Both the Shelly 2PM Gen4 and the Shelly 1 Gen4 support Wi-Fi, Zigbee, and Bluetooth connectivity. They do not require a separate hub for operation. Both devices also support Matter, ensuring compatibility with modern smart home ecosystems. They function as Bluetooth gateways to enhance network connectivity. The connectivity options are identical in the provided data. You can integrate either device with Amazon Alexa, Google Home, or Samsung SmartThings without any difference in wireless performance or protocol support.
Choose the right Shelly relay for you
You need independent control for two circuits
The Shelly 2PM Gen4 features two separate channels. This allows you to manage two distinct loads, such as lights or appliances, independently. You can monitor energy consumption for each circuit individually. This dual-channel setup provides greater flexibility for managing multiple devices from a single unit compared to the single-channel alternative.
You want to automate garage doors or switches
The Shelly 1 Gen4 includes dry contacts. This feature supports integration with 12V and 24-48V DC systems, making it suitable for garage door automation when paired with a Reed switch. The single channel is sufficient for controlling one switch or relay function, offering a focused solution for specific retrofitting needs in tight spaces.
You prefer a single device for basic lighting
The Shelly 1 Gen4 offers a single 16A channel for straightforward lighting control. It fits into standard electrical wall boxes and power sockets. You can automate schedules, control lights remotely, and use manual switches. This single-channel approach simplifies installation for users who do not require the dual-circuit capability of the 2PM model.
The products compared
Shelly 2PM Gen4 2-Channel Relay
Best for: Dual-circuit control with energy monitoring
- Smart Home Compatibility
- Alexa, Google Home, Apple HomeKit
- Hub Requirement
- No Hub Required
- Connectivity
- Wi-Fi, Zigbee, Matter, Bluetooth
- Maximum Load
- 16A per channel
- Dimensions
- 0.63 × 1.65 × 1.46 inches
- Weight
- 0.92 ounces
View on Amazon: Shelly 2PM Gen4 2-Channel Relay Affiliate link
The Shelly 2PM Gen4 is a smart relay with two channels, each handling up to 16A. It includes built-in power metering to track energy use per circuit. The device connects via Wi-Fi, Zigbee, and Bluetooth, requiring no hub. It supports Matter and works with major voice assistants. This unit suits users who need independent control and monitoring for two separate loads in a single compact module.
Pros
- Two channels with 16A load capacity each
- Built-in power metering for energy monitoring
- Supports Wi-Fi, Zigbee, and Bluetooth connectivity
- Matter compatible for broad smart home integration
Cons
- Lacks dry contact outputs found in the Shelly 1 Gen4
- Only 16A per channel limits high-power appliance use
- Non-UL size option available for this specific listing
Good fit if
- You need to monitor energy consumption for two separate circuits
- You want to control bi-directional motors or dual loads
- You prefer a hub-free setup with multiple protocol options
Skip if
- You require dry contacts for specific switch types
- You need a single-channel relay for simple on/off tasks
- You only need basic Wi-Fi control without Zigbee
Verdict: Shelly 2PM Gen4 2-Channel Relay offers dual-channel control with energy monitoring for users managing multiple circuits. It fits those needing independent load management and multi-protocol connectivity in one device.
Shelly 1 Gen4 Smart Relay Switch
Best for: single-circuit automation with Matter support
- Smart Home Compatibility
- Matter, Alexa, Google Home, SmartThings
- Hub Requirement
- No Hub Required
- Connectivity
- Wi-Fi, Zigbee, Bluetooth
- Switch Function
- Relay Switch
- Maximum Load
- 16A
- Dimensions
- 0.63 × 1.65 × 1.46 inches
View on Amazon: Shelly 1 Gen4 Smart Relay Switch Affiliate link
The Shelly 1 Gen4 is a single-channel relay switch supporting Wi-Fi, Zigbee, and Matter. It handles a maximum load of 16A and includes dry contacts for versatile control. The compact unit fits standard wall boxes and requires no hub. It integrates with major smart home platforms and offers voice control. This device suits users needing basic remote switching for lights or appliances in tight spaces.
Pros
- Supports Matter, Wi-Fi, and Zigbee protocols
- Single 16A channel with dry contacts
- No hub required for setup
- Compact size fits standard electrical boxes
Cons
- Single channel limits control to one circuit
- Non-UL certified size option available
- Lacks physical display for local status
Good fit if
- You need a single relay for basic automation
- You require Matter and Zigbee support
- You have tight installation spaces
Skip if
- You need to control two independent circuits
- You require UL certification for the device
- You need a built-in display for local feedback
Verdict: Shelly 1 Gen4 Smart Relay Switch is a compact, single-channel option for users who need Matter and Zigbee support without a hub. It fits well in tight spaces but cannot handle multi-circuit tasks.
Specifications side by side
| Spec | Shelly 2PM Gen4 2-Channel Relay | Shelly 1 Gen4 Smart Relay Switch |
|---|---|---|
| Smart Home Compatibility | Alexa, Google Home, Apple HomeKit | Matter, Alexa, Google Home, SmartThings |
| Hub Requirement | No Hub Required | No Hub Required |
| Connectivity | Wi-Fi, Zigbee, Matter, Bluetooth | Wi-Fi, Zigbee, Bluetooth |
| Switch Function | not stated | Relay Switch |
| Maximum Load | 16A per channel | 16A |
| Dimensions | 0.63 × 1.65 × 1.46 inches | 0.63 × 1.65 × 1.46 inches |
| Weight | 0.92 ounces | 0.92 ounces |
| Size | Non UL | Non UL |
| Color | Black | not stated |
| Model | 3800238070748 | 3800238070687 |
Frequently asked questions
Can the Shelly 2PM Gen4 monitor energy usage for both channels?
Yes, the Shelly 2PM Gen4 supports energy monitoring for its two independent channels. This allows you to track consumption for each connected load separately. The Shelly 1 Gen4 lacks this dual-channel monitoring capability, as it only controls a single circuit.
Do both relays require a separate hub for Zigbee or Matter?
No, neither device requires a separate hub. Both the Shelly 2PM Gen4 and Shelly 1 Gen4 support Zigbee and Matter connectivity directly. You can connect them to your network without additional hardware for protocol translation or management.
Are the physical dimensions identical for both Shelly Gen4 models?
Yes, both units share the same compact form factor. Each measures 1.65 inches in width, 1.46 inches in height, and 0.63 inches in length. They also weigh the same at 0.92 ounces, making them interchangeable for tight installation spaces.
Which model is better for controlling two separate lights?
The Shelly 2PM Gen4 is the better choice for this task. It features two independent channels, allowing you to manage two distinct loads simultaneously. The Shelly 1 Gen4 only provides a single channel, limiting you to one circuit.
Is the Shelly 1 Gen4 compatible with Matter protocols?
Yes, the Shelly 1 Gen4 supports Matter connectivity. This allows it to integrate with various smart home ecosystems without needing a proprietary hub. It also includes Zigbee support for additional network flexibility alongside the Matter standard.
Can I use the Shelly 2PM Gen4 for single-circuit tasks?
Yes, you can use the Shelly 2PM Gen4 for single-circuit tasks. Although it offers two channels, you can utilize just one for your specific load. This provides flexibility if you plan to add a second circuit later.
What is the maximum load rating for these devices?
Both devices share identical maximum load ratings. This specification ensures they handle similar electrical loads for connected appliances or lighting. You should verify your specific device requirements against this shared rating to ensure safe operation for your installation.