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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.
The heart of this module is the high-reliability W3FP-SS-105D relay, designed for consistent performance across both AC and DC loads.
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.
The module typically interfaces with the ESP8266 via GPIO 0.
Power Input: Connect your DC source (5V to 28V) to the screw terminals marked for input.
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.
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).
