--- product_id: 486563949 title: "EM | Wi-Fi-operated Smart Energy Meter and Contactor Control Relay Switch | Home Automation | Works with Alexa & Google Home | iOS Android App | No Hub Required | Power Monitoring" brand: "shelly" price: "¥19571" currency: JPY in_stock: true reviews_count: 9 category: "Shelly" url: https://www.desertcart.jp/products/486563949-em-wi-fi-operated-smart-energy-meter-and-contactor-control store_origin: JP region: Japan --- # 2A contactor control for heavy loads 2 independent measurement channels 365 days cloud data storage EM | Wi-Fi-operated Smart Energy Meter and Contactor Control Relay Switch | Home Automation | Works with Alexa & Google Home | iOS Android App | No Hub Required | Power Monitoring **Brand:** shelly **Price:** ¥19571 **Availability:** ✅ In Stock ## Summary > ⚡ Power up your smart home with Shelly EM — control, monitor, and save like a pro! ## Quick Answers - **What is this?** EM | Wi-Fi-operated Smart Energy Meter and Contactor Control Relay Switch | Home Automation | Works with Alexa & Google Home | iOS Android App | No Hub Required | Power Monitoring by shelly - **How much does it cost?** ¥19571 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/486563949-em-wi-fi-operated-smart-energy-meter-and-contactor-control) ## Best For - shelly enthusiasts ## Why This Product - Trusted shelly brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Year-Long Cloud Data Storage:** Access a full 365 days of power consumption history anytime, anywhere. - • **Seamless Smart Home Integration:** Works effortlessly with Alexa, Google Home, and popular automation platforms—no hub needed. - • **Smart Alerts for Costly Repairs:** Get instant notifications on abnormal energy spikes to prevent expensive breakdowns. - • **Heavy Load & Solar Panel Control:** Manage powerful appliances and monitor renewable energy generation with ease. - • **Dual-Channel Precision Monitoring:** Track energy use on two circuits simultaneously for ultimate control. ## Overview Shelly EM is a Wi-Fi-enabled smart energy meter and contactor relay switch designed for precise dual-channel power monitoring. It stores 365 days of consumption data in the cloud and sends real-time alerts to prevent costly equipment failures. Compatible with Alexa, Google Home, and iOS/Android apps, it requires no hub and supports heavy load control, making it ideal for smart homes and offices aiming to optimize energy use and automate appliances. ## Description From the manufacturer Power Monitoring Shelly ЕМ monitors monophase electrical systems with up to 2 points simultaneously. Power Monitoring Shelly ЕМ monitors monophase electrical systems with up to 2 points simultaneously. Custom Schedules Set custom schedules based on a daily agenda or working hours. Custom Schedules Set custom schedules based on a daily agenda or working hours. Smart Scenes Set custom scenes by combining Shelly EM with your other Shelly devices. Smart Scenes Set custom scenes by combining Shelly EM with your other Shelly devices. Wi-Fi Operated Connect Shelly EM to your Wi-Fi network. No HUB required! Wi-Fi Operated Connect Shelly EM to your Wi-Fi network. No HUB required! 365 Days of Data Storage The measurements from Shelly EM are stored in a free cloud for 365 days. 365 Days of Data Storage The measurements from Shelly EM are stored in a free cloud for 365 days. Contactor Control Shelly EM has an integrated 10A relay output for contactor control. Contactor Control Shelly EM has an integrated 10A relay output for contactor control. Total Power Monitoring Heavy Load Control Solar Panels Monitoring Preventative Monitoring Know your home’s energy consumption with Shelly EM. Monitor and control your power usage to save energy and reduce costs.​ Monitor and control heavy-load appliances like water heaters and heat pumps with Shelly EM, ensuring efficient energy use and cost savings.​ Track energy generation from solar panels and wind turbines. Use Shelly EM to maximize energy efficiency and control.​ Detect and address increased energy consumption from damaged appliances early, saving on repair or replacement costs.​ Technical Information Shelly Devices Comparison Table Shelly EM Shelly 3EM Shelly Pro EM 50A Shelly Pro 3EM (120A) Review: Good bit of kit for automation - Shelly EM is an awesome bit of kit yeah it’s gen one but still works great once you get it connected which isn’t very easy, I’ve not naught a Gen1 product for a while so was really spoiled that the other products just connect via the Shelly app easily, this on the other hand does not and you have to go on its local network web page to get it to work which is a pain, but it works with home assistant you just need to do the advance ColoT to get it working reliably otherwise it drops out, still it’s expensive for a Gen1 product and surprised the price hasn’t reflected that all in all does what it should but you also have an output as well which I use with a wireless contact sensor to power the LED when the door operates. BEAWARE THIS IS THE UNIT ON ITS OWN NOT CT IS INCLUDED WHICH YOU HAVE TO BUY SEPARATELY TO GET IT TO WORK AS INTENDED!! Review: Not usable - Refused to connect to WiFi completely, I've followed guidelines for troubleshooting with no effect at all. Additionally at the time of purchase the 120A clamp listed on the same page was not compatible with the Shelly EM (different plugs). Had to return both items ## Technical Specifications | Specification | Value | |---------------|-------| | Brand | Shelly | | Connector type | Screw | | Contact material | Copper | | Contact type | Normally Open | | Current rating | 2 Amps | | Mounting type | Flush Mount | ## Product Details - **Connector type:** Screw - **Contact material:** Copper - **Contact type:** Normally Open - **Current rating:** 2 Amps - **Mounting type:** Flush Mount ## Images ![EM | Wi-Fi-operated Smart Energy Meter and Contactor Control Relay Switch | Home Automation | Works with Alexa & Google Home | iOS Android App | No Hub Required | Power Monitoring - Image 1](https://m.media-amazon.com/images/I/81sLMUVrdWL.jpg) ![EM | Wi-Fi-operated Smart Energy Meter and Contactor Control Relay Switch | Home Automation | Works with Alexa & Google Home | iOS Android App | No Hub Required | Power Monitoring - Image 2](https://m.media-amazon.com/images/I/81XZul9hbrL.jpg) ![EM | Wi-Fi-operated Smart Energy Meter and Contactor Control Relay Switch | Home Automation | Works with Alexa & Google Home | iOS Android App | No Hub Required | Power Monitoring - Image 3](https://m.media-amazon.com/images/I/71Icn+vrHgL.jpg) ![EM | Wi-Fi-operated Smart Energy Meter and Contactor Control Relay Switch | Home Automation | Works with Alexa & Google Home | iOS Android App | No Hub Required | Power Monitoring - Image 4](https://m.media-amazon.com/images/I/71omh-FOsPL.jpg) ![EM | Wi-Fi-operated Smart Energy Meter and Contactor Control Relay Switch | Home Automation | Works with Alexa & Google Home | iOS Android App | No Hub Required | Power Monitoring - Image 5](https://m.media-amazon.com/images/I/81E1T3cOQ5L.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐ Good bit of kit for automation *by D***D on 18 October 2025* Shelly EM is an awesome bit of kit yeah it’s gen one but still works great once you get it connected which isn’t very easy, I’ve not naught a Gen1 product for a while so was really spoiled that the other products just connect via the Shelly app easily, this on the other hand does not and you have to go on its local network web page to get it to work which is a pain, but it works with home assistant you just need to do the advance ColoT to get it working reliably otherwise it drops out, still it’s expensive for a Gen1 product and surprised the price hasn’t reflected that all in all does what it should but you also have an output as well which I use with a wireless contact sensor to power the LED when the door operates. BEAWARE THIS IS THE UNIT ON ITS OWN NOT CT IS INCLUDED WHICH YOU HAVE TO BUY SEPARATELY TO GET IT TO WORK AS INTENDED!! ### ⭐ Not usable *by Z***T on 11 April 2026* Refused to connect to WiFi completely, I've followed guidelines for troubleshooting with no effect at all. Additionally at the time of purchase the 120A clamp listed on the same page was not compatible with the Shelly EM (different plugs). Had to return both items ### ⭐⭐⭐⭐ Reliable Wi-Fi energy monitor *by A***N on 19 January 2025* The Shelly EM is a reliable and effective Wi-Fi-connected energy monitor that integrates effortlessly with Home Assistant. Once set up, it works flawlessly and provides accurate energy monitoring with great convenience. However, there are a couple of drawbacks. Pairing took four or five attempts because it requires a 2.4GHz network, and my phone was initially connected to the 5GHz network (both share the same SSID). Additionally, it would benefit from a case or cover for the exposed live screw terminals. I had to resort to using electrical tape. Despite these issues, the Shelly EM is a solid choice for energy monitoring, particularly for those who use home automation tools such as Home Assistant. ## Frequently Bought Together - Shelly EM | Wi-Fi-operated Smart Energy Meter and Contactor Control Relay Switch | Home Automation | Works with Alexa & Google Home | iOS Android App | No Hub Required | Power Monitoring - Shelly Split Core Current Transformer 50A | Current clamp | Home automation | Compatible with Shelly EM | Single-phase installation | Current measurement --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/486563949-em-wi-fi-operated-smart-energy-meter-and-contactor-control](https://www.desertcart.jp/products/486563949-em-wi-fi-operated-smart-energy-meter-and-contactor-control) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-06-19*