ESP8266 Wi-Fi Relay Module – 220 VAC

Designed for ultimate flexibility, this ESP8266-based relay module eliminates the need for precision power regulators. With a massive 5V to 28V DC input range, it can be powered by anything from a standard USB charger to a 24V industrial power supply, making it the most adaptable switch in your toolkit.

Technical Specifications

The heart of this module is the high-reliability W3FP-SS-105D relay, designed for consistent performance across both AC and DC loads.

High-Performance Hardware Features

• Multi-Voltage Support: Whether you are using a 9V battery, a 12V automotive system, or a 24V PLC rail, this board handles the power without extra buck converters.

• High-Spec Switching: The 7A 277VAC rating makes it exceptionally safe for standard household mains (220V-240V) with extra overhead for voltage spikes.

• Industrial Stability: Built on a high-quality green 4-layer PCB with anti-climb traces to prevent electrical arcing between high-voltage terminals.

• Isolation: Features an onboard optocoupler to ensure the ESP8266 logic stays protected from the high-voltage side of the relay.

Wiring & Logic

The module typically interfaces with the ESP8266 via GPIO 0.

1. Power Input: Connect your DC source (5V to 28V) to the screw terminals marked for input.

2. Relay Output: * COM: Common terminal.

   • NO (Normally Open): Circuit closes when the relay is activated.

   • NC (Normally Closed): Circuit opens when the relay is activated.

3. Network Setup: Compatible with Tasmota, WLED, or custom Arduino/ESP-IDF code for MQTT or HTTP control.

Note for Web Inventory: This model is the “Wide-Voltage High-Spec” version. It is superior to standard 5V-only modules as it survives accidental over-voltage up to 28V and supports higher AC voltage ratings (277V).