The Shelly Pro Dimmer 1PM is a professional-grade, DIN-rail mounted smart dimmer designed for modern electrical cabinets and advanced home or building automation projects. Combining precise trailing edge dimming with integrated power monitoring and robust network connectivity, it gives installers and enthusiasts fine-grained control over lighting while keeping energy usage visible and under control.
As part of the Shelly Pro ecosystem, the Shelly Pro Dimmer 1PM is built for reliability, safety, and flexibility. It sits neatly on the DIN rail alongside breakers and other protection devices, integrates with existing automation platforms, and can be managed locally via its embedded web interface or through the cloud. For electricians, smart home professionals, and technically minded homeowners, it offers a capable dimming solution that fits naturally into a structured electrical cabinet.
Right out of the box, the Shelly Pro Dimmer 1PM delivers several standout benefits:
- One-channel trailing edge dimming for smooth control of compatible LED, incandescent, and transformer-based loads.
- Built-in power and energy monitoring using onboard voltage, current, and energy metering.
- Wi-Fi, LAN, and Bluetooth connectivity for flexible setup, provisioning, and integration into existing networks.
- DIN-rail form factor that fits standard distribution boards and professional control panels.
This makes the Shelly Pro Dimmer 1PM a strong candidate for:
- Electricians looking for a dimmer that installs cleanly in distribution boards.
- Smart home installers building centralised or cabinet-based lighting control systems.
- Renovators and retrofitters upgrading legacy lighting to smart, dimmable control.
- Professional automation integrators who need API, MQTT, and scripting support for complex projects.
- Power users and enthusiasts who want cabinet-grade hardware rather than wall-box modules.
What the Shelly Pro Dimmer 1PM Does
The Shelly Pro Dimmer 1PM is designed to give users professional-grade lighting control inside a structured electrical cabinet. Offering precision dimming, detailed energy monitoring, and a wide range of automation options, it provides a flexible and reliable foundation for modern lighting systems in homes, businesses, and integrated control environments.
Core Capabilities
The device combines intelligent dimming with full electrical monitoring, making it far more than a simple light controller. Its core functions include:
- Remote control and dimming through the Shelly app, local browser interface, or home automation system.
- Real-time metering via built-in voltmeter, ammeter, and energy monitoring tools, providing accurate consumption data.
- Trailing-edge dimming for smooth, low-noise control of LED, halogen, and transformer-driven lighting.
- Fully local operation—no cloud connection required, ensuring independence and privacy.
Connectivity and Interface Options
The Shelly Pro Dimmer 1PM offers multiple communication paths, allowing installers to use the most suitable option for each environment:
- Wi-Fi 802.11 b/g/n for traditional wireless connectivity.
- LAN (RJ45) for stable, cabinet-friendly wired networking.
- Bluetooth for simple device provisioning during setup.
- API and MQTT support for advanced automation and integration with local controllers.
- Webhooks (up to 20, each with multiple URLs) enabling event-driven automation.
Smart Home Compatibility
Thanks to its open and flexible communication options, the Shelly Pro Dimmer 1PM slots seamlessly into most smart-home and automation ecosystems. It works with:
- Shelly Cloud for remote access and cross-device automation.
- Home Assistant for local, privacy-focused integrations.
- MQTT brokers for custom automation systems.
- Open-source platforms and third-party controllers through Shelly’s documented API.
Safety and Reliability Features
Designed for professional environments, the Shelly Pro Dimmer 1PM integrates several safeguards that help protect both the device and the electrical system:
- Internal temperature sensor that monitors device heat levels for safe operation.
- External protection requirements (e.g., 10A circuit breaker) to ensure compliance with installation standards.
- High-quality DIN-rail housing with heat-resistant insulation and secure screw terminals.
Hardware Overview
Under the hood, the Shelly Pro Dimmer 1PM is powered by modern hardware that delivers efficiency and responsive control:
- ESP32-D0WDQ6 processor providing fast and stable operation.
- 8 MB flash memory for firmware and configuration storage.
- Low energy consumption of under 2 W.
- Maximum output of up to 200 W depending on the connected load.
- Wide operating temperature range suited for electrical cabinets and technical spaces.
Supported Loads
The dimmer is compatible with a broad range of lighting technologies, making it suitable for both modern and legacy systems:
- Incandescent lamps
- Dimmable LED bulbs
- Dimmable electronic transformers
- Iron-core transformers with low-voltage lamps
Installation, Wiring, and Use Cases
The Shelly Pro Dimmer 1PM is built for clean, cabinet-grade installation, making it a natural fit for structured wiring systems in homes, commercial spaces, and automation panels. Because it operates directly on mains voltage, installation must be handled by a qualified electrician, and all work should begin with the power fully isolated and verified with appropriate test equipment. Shelly specifies the use of solid or stranded conductors fitted with ferrules, ensuring secure connections within the screw terminals and long-term resistance to heat and vibration inside a DIN-rail enclosure.
Once mounted and wired, the dimmer offers several switching configurations. In setups where users want traditional tactile control, the SW1 and SW2 terminals accept momentary push buttons for single- or dual-button dimming. Single-button wiring allows a simple press-to-toggle and press-and-hold dimming action, while dual-button wiring separates the dim-up and dim-down functions. For installations that require straightforward on/off control, the dimmer can operate with a basic switch connected to SW1. The lighting load connects to the O terminal, with a mandatory neutral connection to ensure stable trailing-edge dimming performance. Installers working in structured cabinets can also take advantage of the integrated RJ45 port, which provides reliable wired networking—ideal for locations where Wi-Fi coverage is limited or where network stability is essential.
On first power-up, the device broadcasts its own Wi-Fi access point, allowing the installer to perform initial configuration before joining it to a permanent Wi-Fi or LAN connection. From there, the dimmer can be managed locally via its built-in web interface or integrated into a wider automation system.
Real-World Applications
The Shelly Pro Dimmer 1PM shines in environments that demand consistent, controllable lighting. In residential systems, it offers smooth LED dimming and the flexibility to create intelligent lighting scenes that blend convenience with energy efficiency. In offices or retail spaces, its built-in power monitoring helps facility managers understand usage patterns and fine-tune lighting schedules to reduce energy waste. For renovators upgrading older lighting circuits, the ability to operate entirely offline—without reliance on cloud services—ensures long-term reliability and privacy.
Because it is designed for DIN-rail mounting, the dimmer integrates neatly into distribution boards alongside breakers, contactors, and automation modules, making it especially appealing for electricians working on modern renovation projects or new builds. Professional integrators can combine its API support, MQTT capabilities, and scripting engine to build highly customised automation workflows that connect lighting behaviour to sensors, alarms, or building management systems.
Automation and Performance
Beyond its hardware features, the Shelly Pro Dimmer 1PM includes a versatile internal automation engine. Up to twenty schedules can run directly on the device, allowing timed dimming changes, daily routines, or sunrise-based lighting events without assistance from a hub. Webhooks enable the dimmer to react to external triggers, while local scripts and MQTT integration make it suitable for advanced, decentralised control systems.
In day-to-day operation, the dimmer responds quickly to local buttons and software commands, with its LAN connection providing particularly low-latency performance in cabinet installations. LED dimming remains stable thanks to its trailing-edge design, and the onboard metering delivers accurate real-time data that can be viewed locally or integrated into wider dashboards. Whether deployed in a single-room setup or a full building automation network, the Shelly Pro Dimmer 1PM offers the consistency, responsiveness, and integration depth expected from a professional-grade lighting controller.
Quick Specifications Recap
The Shelly Pro Dimmer 1PM is engineered as a compact, cabinet-ready module that fits naturally into modern DIN-rail installations. Its footprint is small enough for crowded distribution boards, yet it houses all the hardware required for accurate dimming, power monitoring, and long-term reliability. Below is a concise technical overview to support installers and system designers evaluating its capabilities.
Physically, the device measures 94 × 19 × 69 mm and weighs just 75 g, making it slim enough to occupy a single rail slot while still providing front-facing access to terminals, LAN port and status indicators. It operates on a wide input range of 110–240 VAC at 50/60 Hz, and supports lighting loads up to 200 W depending on the connected lamp type. As a trailing-edge dimmer, it is optimised for smooth and stable control of dimmable LED lamps, incandescent lights, and compatible transformer-based loads.
Connectivity options include Wi-Fi b/g/n, Bluetooth (for provisioning), and a dedicated RJ45 LAN port for installations where reliability and reduced latency are priorities. Internally, the dimmer is driven by an ESP32-D0WDQ6 processor paired with 8 MB of flash memory, ensuring fast response times, robust local operation, and support for scripts, MQTT, and webhooks.
For monitoring and protection, the device includes a built-in voltmeter, ammeter, power and energy meter, and an internal temperature sensor. These features enable precise real-time feedback and enhance system safety, especially when deployed in larger lighting networks. Environmentally, the dimmer is rated for operating temperatures between -20°C and 40°C with a humidity tolerance of 30–70% RH, making it suitable for most indoor electrical cabinet environments.
The enclosure is built from heat-resistant plastic and designed specifically for DIN-rail mounting, allowing it to be installed securely alongside breakers and other modular automation components. Combined with low power consumption of under 2 W, the Shelly Pro Dimmer 1PM offers a reliable, efficient, and well-rounded hardware platform for professional lighting control.
FAQs
What is the Shelly Pro Dimmer 1PM?
The Shelly Pro Dimmer 1PM is a DIN-rail mounted smart dimmer designed for professional lighting control in electrical cabinets. It offers trailing-edge dimming, LAN and Wi-Fi connectivity, and built-in power and energy monitoring.
Can it dim LED bulbs properly?
Yes. The dimmer uses trailing-edge control, which is generally the best choice for modern dimmable LED lamps. Performance varies by brand, so pairing it with high-quality dimmable LEDs will deliver the smoothest results.
What is the maximum load it can handle?
The Shelly Pro Dimmer 1PM supports loads up to 200 W depending on the lamp type. LED loads typically reach their limit earlier due to driver characteristics, so always check the total wattage of the lighting circuit.
Does it require a neutral wire?
Yes. The device must be wired with both live and neutral conductors to operate correctly. This is essential for stable dimming and accurate power monitoring.
Can it be used without Wi-Fi or cloud access?
Absolutely. The dimmer can operate completely offline through local scripts, LAN, or hardware button inputs. Cloud control is optional, not required for normal use.
LAN vs. Wi-Fi – which should I choose?
LAN provides the most stable, low-latency performance and is preferred in electrical cabinets. Wi-Fi is suitable when a wired network connection is unavailable, but ensure signal strength is adequate inside the enclosure.
Is it compatible with Home Assistant or MQTT?
Yes. The dimmer integrates easily with Home Assistant using native Shelly support or via MQTT. It also supports webhooks and API access for custom automation setups.
Can I use it with existing wall switches?
Yes. The SW1 and SW2 inputs work with standard momentary push buttons or simple switches, allowing you to maintain physical control points in your lighting circuit.
Does it use leading-edge or trailing-edge dimming?
The Shelly Pro Dimmer 1PM uses trailing-edge dimming, which provides smoother, quieter operation with most modern LEDs and electronic transformers.
How do single and dual button controls work?
In single-button mode, one push button connected to SW1 toggles the light and dims with a long press. In dual-button mode, SW1 and SW2 act as separate dim-up and dim-down inputs for more precise control.
Why does my LED flicker?
Flicker usually occurs when LED lamps are not fully compatible with trailing-edge dimming or when the load is too low. Using high-quality dimmable LEDs and ensuring the minimum load requirement is met typically resolves the issue.
Does it support 0–10 V dimming?
No. The Shelly Pro Dimmer 1PM is a mains-voltage trailing-edge dimmer and does not support 0–10 V or DALI control systems.
Is it safe for outdoor cabinets?
The device is intended for indoor use only. If installing in an outdoor cabinet, ensure the enclosure is fully sealed, dry, and compliant with local electrical protection standards.
Can I monitor energy consumption?
Yes. The built-in power, voltage, current, and energy meters provide real-time and historical consumption data accessible through the app, local web interface, or automation system.
What loads are not supported?
The dimmer does not support non-dimmable LED bulbs, fluorescent fixtures, 0–10 V drivers, or any load outside the supported list of incandescent, dimmable LED, electronic transformers, and iron-core transformers.
Final Thoughts
The Shelly Pro Dimmer 1PM brings together professional-grade dimming, reliable power monitoring, and robust connectivity in a compact DIN-rail module designed for modern electrical systems. It stands out because it delivers the flexibility expected by smart-home enthusiasts while meeting the installation standards required by electricians and automation specialists. Whether deployed as part of a full building automation network or used simply to improve the behaviour and efficiency of LED lighting, it offers a level of control that goes far beyond a traditional wall-box dimmer.
Its support for LAN, Wi-Fi, scripts, MQTT, and local automation gives homeowners, integrators, and commercial installers a versatile toolkit for building customised lighting behaviour. At the same time, trailing-edge dimming and accurate onboard metering ensure smooth performance and precise energy visibility—both essential for modern, energy-optimised lighting systems. The result is a dimmer that performs equally well in smart-home upgrades, commercial retrofits, and structured wiring environments where consistency and reliability matter.
If you’re looking for a dependable, cabinet-ready dimming module that fits effortlessly into advanced automation projects, the Shelly Pro Dimmer 1PM is an excellent choice. Explore more about this product and how it can enhance your next installation.
