IoTextra Relay2 - 4-channel SPDT relay module

The IoTextra Relay2 (Rev. 3.02) is a professional 4-channel SPDT relay module designed for reliable switching in industrial automation, smart home systems, and HVAC control. Equipped with high-quality relays (Panasonic, Omron, HF, or TE), this module provides robust galvanic isolation and high-current switching capabilities for both AC and DC loads.

With its dual-mode control architecture, the IoTextra Relay2 offers seamless integration into any professional project, ensuring safety with 4000Vrms isolation between the coil and contacts.

Key Features

• 4 High-Quality SPDT Relays: Support for Panasonic ALQ105, Omron G5Q-14, HF33F, or TE PE014005 (1 Form C).
• High Power Switching: Rated for up to 10A at 250VAC or 30VDC.
• Dual Operating Modes: Control relays directly via GPIO (HOST-P connector) for real-time response or via I2C (onboard TCA9534 expander) to save microcontroller pins.
• Superior Safety: Galvanic isolation of 4000Vrms between coil and contacts, with a surge resistance of 8000V.
• Visual Feedback: Dedicated LED indicators for each relay channel and a 3.3V logic power indicator.
• Expandable Design: Dual Qwiic connectors for easy I2C daisy-chaining and a DIP switch for flexible addressing.

Technical Specifications

• Switching Capacity: 10A 250VAC / 30VDC.
• Isolation: 4000Vrms (coil-contacts), 750Vrms (between open contacts).
• Logic Voltage: 3.3V (via onboard regulator); Power Supply: 5VDC.
• Interfaces: HOST-P10/P12 connector, Dual Qwiic (I2C).
• I2C Addressing: Configurable via jumpers (supports up to 16 modules on a single bus).
• Dimensions: 47 x 56 mm.

Software Support

As part of the Make Things Happy ecosystem, the IoTextra Relay2 is fully compatible with:

• IoTflow and Node-RED
• Tasmota and Blynk
• MQTT based environments

Compatible Ecosystem

Designed for a perfect fit with:

• Microcontrollers: IoTsmart ESP32-S3, IoTsmart RP2350.
• Base Modules: IoTbase PICO, IoTbase Nano.

Shipping List

• 1 x IoTextra Relay2 Module (Rev. 3.02)
• (Note: 3.5mm pitch terminal blocks and mounting hardware are sold separately).