{"product_id":"shelly-pro-3em-switch-add-on-relay","title":"Shelly Pro 3EM Switch Add-on 2A Dry Contact Relay Module DIN Rail","description":"\u003ch1 style=\"color: #f87c24;\"\u003eShelly Pro 3EM Switch Add-on, Galvanically Isolated 2A Dry Contact Relay for DIN Rail\u003c\/h1\u003e\n\u003cp\u003eThe Shelly Pro 3EM Switch Add-on adds a galvanically isolated relay output to a Shelly Pro 3EM energy meter. It clips onto the side of the meter on the DIN rail, so a single unit can both measure consumption and switch a contactor or other low current load.\u003c\/p\u003e\n\u003cp\u003eThe potential free contact switches up to \u003cstrong\u003e2A at 240V AC or 2A at 30V DC\u003c\/strong\u003e. It is designed for control circuits and light loads rather than direct switching of heavy appliances. A Shelly Pro 3EM is required and is not included.\u003c\/p\u003e\n\u003ch3 style=\"color: #f87c24;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdd-on module for the Shelly Pro 3EM only, connected through the Shelly proprietary add-on interface.\u003c\/li\u003e\n\u003cli\u003eGalvanically isolated, potential free (dry) relay contact with separate input (I) and output (O) terminals.\u003c\/li\u003e\n\u003cli\u003eSwitches up to 2A at 240V AC or 2A at 30V DC.\u003c\/li\u003e\n\u003cli\u003ePowered from the Shelly Pro 3EM at 3.3V and 12V DC, with power consumption below 1W.\u003c\/li\u003e\n\u003cli\u003eInternal temperature sensor with temperature reporting.\u003c\/li\u003e\n\u003cli\u003eTwo red LED indicators: Power (supply connected) and Out (relay contact closed).\u003c\/li\u003e\n\u003cli\u003eSlim 19mm wide housing that mounts on a DIN rail alongside the Pro 3EM, with a double mounting bracket supplied.\u003c\/li\u003e\n\u003cli\u003eScrew terminals for 0.5 to 2.5mm² solid, stranded or bootlace ferrule conductors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"color: #f87c24;\"\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Shelly Pro 3EM measures energy on up to three phases. On its own it reports what is happening; with the Switch Add-on fitted it can also act on that information. The add-on gives the meter a relay output that can be controlled locally or through automations, for example energising a contactor when consumption, export or another condition is met.\u003c\/p\u003e\n\u003cp\u003eThe add-on replaces the mounting bracket on one side of the Pro 3EM and plugs into the meter's header connector. Both devices then sit on the DIN rail as one assembly, held by the supplied double bracket. The add-on takes its power from the Pro 3EM, so no separate supply is needed.\u003c\/p\u003e\n\u003cp\u003eBecause the contact is isolated from the meter electronics, it can switch either an AC circuit up to 240V or a DC control circuit up to 30V. The manufacturer lists resistive, capacitive and inductive loads as supported, including contactors, transformers and fans, with an RC snubber shown in the wiring guidance for inductive loads. With a 2A limit, larger loads should be switched through a correctly rated contactor driven by the add-on.\u003c\/p\u003e\n\u003ch3 style=\"color: #f87c24;\"\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDriving a contactor from a Shelly Pro 3EM based on measured consumption or export\u003c\/li\u003e\n\u003cli\u003eSwitching small resistive loads such as indicator lamps or small heating elements\u003c\/li\u003e\n\u003cli\u003eLow voltage DC control signals up to 30V, such as an inverter or controller enable input\u003c\/li\u003e\n\u003cli\u003eResidential consumer units and multi dwelling buildings\u003c\/li\u003e\n\u003cli\u003eLight commercial, agricultural and industrial energy monitoring and control panels\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"color: #f87c24;\"\u003eWhat Is Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Shelly Pro 3EM Switch Add-on\u003c\/li\u003e\n\u003cli\u003e1 x Double DIN rail mounting bracket\u003c\/li\u003e\n\u003cli\u003e1 x Printed user and safety guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"color: #f87c24;\"\u003eInstallation and Safety Notes\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e this add-on works only with the Shelly Pro 3EM, which is sold separately. It does not work as a standalone switch.\u003c\/p\u003e\n\u003cp\u003eInstallation must be carried out by a qualified electrician in line with BS 7671 (IET Wiring Regulations). Isolate the supply and confirm with a voltage tester or multimeter that there is no voltage on the Pro 3EM terminals before fitting the add-on or changing any connection. Take care not to bend the header pins when joining the add-on to the meter.\u003c\/p\u003e\n\u003cp\u003eConnect the load circuit to the O terminal and the neutral, and connect the I terminal to a suitably rated circuit breaker. A neutral conductor is needed for the switched load circuit. Never exceed 2A at 240V AC or 2A at 30V DC; use a contactor for anything larger. Solid single core conductors are recommended, stripped 6 to 7mm, with terminal screws tightened to no more than 0.4Nm.\u003c\/p\u003e\n\u003cp\u003eThe add-on has no published IP rating and must not be installed anywhere it can get wet. Fit it only inside a dry indoor consumer unit or enclosure, within an ambient temperature of minus 20°C to 40°C and 30% to 70% relative humidity. High voltage is present on the add-on interface when the device is powered.\u003c\/p\u003e","brand":"Shelly","offers":[{"title":"Default Title","offer_id":61318926958926,"sku":"003118","price":34.98,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0796\/3698\/8238\/files\/shelly-pro-3em-switch-add-on-shelly.webp?v=1792661488","url":"https:\/\/voltaconsolar.com\/products\/shelly-pro-3em-switch-add-on-relay","provider":"VoltaconSolar","version":"1.0","type":"link"}