Ogemray Smart Relay 25A vs Shelly Pro 2CB: Third-Party vs Shelly Comparison for High-Power Applications

When outfitting a smart home for heavy-duty loads—like electric heaters, water pumps, or workshop machinery—the choice of relay becomes critical. The market offers both official Shelly relays and third‑party alternatives that promise similar specs at a lower price. Among the latter, the Ogemray Smart Relay 25A has gained attention for its high current rating and affordable tag. But does it truly compete with proven devices like the Shelly Pro 2CB C16? This comparison looks at the essential differences in power handling, build quality, software ecosystem, and long-term value.

Both relays are designed for DIN‑rail installation and can switch 25A circuits, but they come from different philosophies. Shelly’s Pro series is built for professional electricians and integrators, offering robust certifications, over‑the‑air updates, and seamless integration with major smart home platforms. The Ogemray, on the other hand, appeals to DIY enthusiasts who want maximum amperage at minimal cost. We’ll explore whether saving money upfront leads to compromises in safety, reliability, or convenience.

Overview of Ogemray Smart Relay 25A

The Ogemray Smart Relay 25A is a third‑party Wi‑Fi relay that claims support for 25A resistive loads and up to 30A peak. It is often marketed as a budget friendly alternative for controlling high‑power appliances such as water heaters, air conditioners, or EV chargers. The device includes basic energy monitoring, a built‑in web interface, and compatibility with apps like Smart Life or Tuya. However, its certifications may not match the stringent standards required for professional installations, and its firmware updates depend on the manufacturer’s schedule. For hobbyists who accept these limitations, the Ogemray provides a low barrier to entry.

Key features include manual ON/OFF buttons, an LED indicator, and support for timer and schedule functions. The relay communicates over 2.4 GHz Wi‑Fi and can be integrated with Alexa or Google Home through third‑party skills. While the hardware appears solid, users have reported occasional connectivity drops and inconsistent power‑monitoring accuracy. The Ogemray lacks remote override capabilities beyond standard app controls, and its mobile interface is less polished than Shelly’s. It is available through general e‑commerce channels rather than specialized home automation retailers.

• Rated for 25A resistive / 20A inductive loads
• Wi‑Fi 2.4 GHz, works with Tuya/Smart Life ecosystem
• Basic energy monitoring (kWh, power, current)
• No certified safety marks for many regions; limited technical support

Overview of Shelly Pro 2CB C16

The Shelly Pro 2CB C16 is a professional‑grade, dual‑channel smart relay with a total continuous current of 32A (16A per channel) and peak handling that easily covers 25A applications when used in parallel. Part of Shelly’s Pro series, it features built‑in RS485, dry contact support, and full compatibility with Modbus, MQTT, and all major smart home systems (Home Assistant, Domoticz, OpenHAB). The device is equipped with a powerful ESP32 chip, over‑the‑air firmware updates, and Shelly’s renowned reliability through rigorous CE, FCC, and UKCA certifications.

Installation is straightforward for electricians: the relay snaps onto a DIN rail and can be controlled via the Shelly Cloud or locally with no cloud dependency. The Shelly Pro 2CB C16 also offers advanced functions such as automated actions for temperature/humidity sensors, scheduling, and energy monitoring for every channel. Compared to the Ogemray, the Shelly Pro 2CB C16 provides more precise monitoring, a responsive local API, and integration with Shelly accessories like the Shelly Plus AddOn +3DS for extended input capabilities. These features make it the go‑to choice for mission‑critical or commercial environments.

• 16A per channel (32A total with channels combined for single‑load use)
• Dual‑channel, dry contact, RS485, Modbus support
• Advanced energy monitoring with 1% accuracy class
• Professional certifications; 3‑year warranty and direct manufacturer support

Key Differences: Power, Features, and Reliability

At first glance, both relays can handle 25A loads, but the way they achieve this differs. The Ogemray rates a single channel at 25A, while the Shelly Pro 2CB can be wired with its two channels in parallel to deliver 32A continuous—offering headroom for inductive loads or start‑up surges. In real‑world testing, the Shelly Pro 2CB reports power data more reliably and maintains stable Wi‑Fi connections, partly due to its higher‑quality power supply and antenna design. Ogemray’s relay may struggle with sustained high currents, especially in poorly ventilated enclosures.

Feature depth is another clear separator. The Shelly Pro 2CB C16 supports power‑on default settings, multi‑user access, and seamless automation with Shelly sensors such as the Shelly LoRa Add‑on 2‑pack for remote area connectivity. The Ogemray offers only basic schedule and timer functionality. For users who need professional integrity—for example, integrating with a building management system or ensuring fail‑safe positions—the Shelly product is far superior. The Ogemray is acceptable for simple on/off control but lacks the intelligent feedback and security of Shelly’s platform.

• For surge‑prone loads, Shelly Pro 2CB provides more robust thermal management
• Shelly offers local control via MQTT; Ogemray relies on cloud for advanced functions
• Shelly’s warranty and support contrast with limited third‑party assistance

Cost vs Features: Which Offers Better Value?

Price is where the Ogemray Smart Relay 25A shines: it is typically 30–50% cheaper than the Shelly Pro 2CB C16. For a single project on a tight budget, the Ogemray may seem attractive. However, when factoring in the total cost of ownership—time spent troubleshooting, potential hardware failures, and the lack of advanced features—the savings shrink. The Shelly Pro 2CB C16 includes features that reduce installation and maintenance effort, such as quick setup via the Shelly Smart Control app, automated firmware updates, and compatibility with energy dashboards that help users optimize consumption.

Moreover, the Shelly Pro 2CB C16 can be combined with other Shelly products like the Shelly Pro 1CB C32A for additional channels or the Shelly Wall Display X1i Black for a human‑machine interface. This ecosystem integration allows for centralized management and future‑proof expansion. The Ogemray is a standalone device; expanding your system means dealing with multiple apps and inconsistent user experiences. For most users, the premium for Shelly is justified by reliability, support, and long‑term flexibility—especially when the relay controls critical loads like water pumps or EV chargers. A single failure in a cheap relay can cost far more than the price difference.

• Ogemray: low upfront cost, minimal ecosystem, higher risk for high‑power use
• Shelly Pro 2CB: higher price, but includes professional support, certifications, and seamless automation

While the Ogemray Smart Relay 25A can serve as a quick, low‑cost solution for non‑critical loads, the Shelly Pro 2CB C16 delivers superior reliability, advanced features, and professional‑grade support that makes it the better investment for any serious smart home or commercial project. If your application demands flawless performance and expandability, choosing Shelly will save you time, money, and frustration in the long run.