Shelly Plus 1PM UL
Short Description
The Shelly Plus 1PM UL is a UL-certified, compact smart switch with built-in power measurement. It enables remote control of electric appliances via smartphone, tablet, PC, or home automation systems. The device operates standalone within a local Wi-Fi network or integrates with cloud-based home automation services.
Users can access, control, and monitor the device remotely from any location with internet connectivity, provided the device is connected to a Wi-Fi router and the internet.
Designed for retrofit installations, it fits into standard electrical wall boxes, behind power outlets, light switches, or other space-constrained locations.
The device includes an embedded web interface for monitoring, control, and configuration.
Device Identification
- Device Name: Shelly Plus 1PM UL
- Device Model: SNSW-001P15UL
- Device SSID: ShellyPlus1PM-XXXXXX
Main Applications
- Residential
- MDU (Multi Dwelling Units – apartments, condominiums, hotels, etc.)
- Light Commercial (small offices, retail stores, restaurants, gas stations, etc.)
- Government / Municipal
- University / College
Integrations
Amazon Alexa Supported Capabilities
Yes
Google Smart Home Supported Traits
Yes
Samsung SmartThings Supported Capabilities
Yes
Simplified Internal Schematics
Device Electrical Interfaces
Inputs
- 1 switch/button input on screw terminal: SW
- 5 power supply inputs on screw terminals: 2 N (+) and 3 L (Ʇ)
Outputs
- 1 relay output with power measurement on screw terminal: O
Add-on Interface
- Shelly proprietary serial interface
⚠ CAUTION: High voltage is present on the add-on interface when the device is powered.
Connectivity
- Wi-Fi
- Bluetooth
Safety Features
- Overheating protection
- Overvoltage protection
- Overcurrent protection
- Overpower protection
Supported Load Types
- Resistive (incandescent bulbs, heating devices)
- Capacitive (capacitor banks, electronic equipment, motor start capacitors)
- Inductive with RC Snubber (LED light drivers, transformers, fans, refrigerators, air conditioners)
User Interface
Inputs
- One (Reset) button
- Press and hold for 5 seconds to enable device access point and Bluetooth connection.
- Press and hold for 10 seconds to perform a factory reset.
Outputs
- LED (monocolor) indication
- AP enabled, Wi-Fi disabled: 1 second ON / 1 second OFF
- Wi-Fi enabled, not connected to network: 1 second ON / 3 seconds OFF
- Connected to Wi-Fi network: Constantly ON
- Cloud enabled, not connected: 1 second ON / 5 seconds OFF
- Connected to Shelly Cloud: Constantly ON
- OTA (Over-the-Air Update): ½ second ON / ½ second OFF
- Button pressed and held for 5 seconds: ½ second ON / ½ second OFF
- Button pressed and held for 10 seconds: ¼ second ON / ¼ second OFF
Note: The list starts with the initial device status and lower-priority states. Each subsequent state overrides the previous one.
Specifications
| Category | Type | Value |
|---|---|---|
| Physical | Size (HxWxD) | 37 × 42 × 16 mm / 1.46 × 1.65 × 0.63 in |
| Weight | 27 g / 0.95 oz | |
| Mounting | Wall console | |
| Screw terminals max torque | 0.4 Nm / 3.5 lbf·in | |
| Conductor cross section | 0.5 to 1.5 mm² / 20 to 14 AWG | |
| Conductor stripped length | 5 to 6 mm / 0.20 to 0.24 in | |
| Shell material | Plastic | |
| Color | Red | |
| Environmental | Ambient temperature | -20 °C to 40 °C / -5 °F to 105 °F |
| Humidity | 30 % to 70 % RH | |
| Max. altitude | 2000 m / 6562 ft | |
| Electrical | Power supply | 110–240 VAC, 50/60 Hz 24–30 VDC |
| Power consumption | < 1.2 W | |
| Max switching voltage (AC) | 240 V (single wire) | |
| Max switching voltage (DC) | 30 V | |
| Max switching current (AC) | 15 A | |
| Max switching current (DC) | 10 A | |
| Internal temperature sensor | Yes | |
| Voltmeter (AC) | Yes | |
| Ammeter (AC) | Yes | |
| Radio | RF band | 2400 – 2495 MHz |
| Max RF power | < 20 dBm | |
| Wi-Fi protocol | 802.11 b/g/n | |
| Wi-Fi range | Up to 30 m / 100 ft indoors Up to 50 m / 160 ft outdoors (Depends on local conditions) | |
| Bluetooth protocol | 4.2 | |
| Bluetooth range | Up to 10 m / 33 ft indoors Up to 30 m / 100 ft outdoors (Depends on local conditions) | |
| MCU | CPU | ESP32-U4WDH |
| Flash | 4 MB | |
| Firmware Capabilities | Schedules | 20 |
| Webhooks (URL actions) | 20 hooks, up to 5 URLs per hook | |
| Scripting | Yes | |
| MQTT | Yes | |
| CoAP | No |
Basic Wiring Diagrams
110–240 VAC power supply – Resistive load
110–240 VAC power supply – Inductive load with RC snubber
24–30 VDC power supply – Resistive load
24–30 VDC power supply – Inductive load with RC snubber
Legend
Terminals
- O: Load circuit output terminal
- SW: Switch (controlling O) input terminal
- L: Live (110–240 V) terminal
- N: Neutral terminal
- +: 24–30 VDC positive terminal
- Ʇ: 24–30 VDC ground terminal
Wires
- +: 24–30 VDC positive wire
- GND: 24–30 VDC ground wire
- N: Neutral wire
Troubleshooting
Device Is Overheating
- Avoid using the L and N terminals as bridging points. Using them as bridges doubles the current flow through these terminals, leading to overheating. Bridging is only safe with low-current applications where total current remains under 15 A.
- Ensure ambient temperature does not exceed 40 °C (105 °F). In enclosed or confined spaces, heat buildup may occur. Provide adequate ventilation around the device.
Web Interface Guide
Read the Shelly Plus 1PM, 1PM UL web interface guide
Components and APIs
Printed User Guide
Shelly Plus 1PM UL bilingual printed user and safety guide.pdf