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Green rectangular circuit board with eight black relay modules and a white Grove connector

Seeed Studio

Seeed Studio Grove 8-Channel Solid State Relay

SKU CH-4VAZ-8KVK1

Controls up to eight AC loads from a 5 VDC signal with solid-state speed and no moving parts

  • TypeSensors
  • 5 VDC controls up to 240 VAC loads
  • Solid-state switching eliminates contact wear and sparking
  • I2C-driven STM32F030F4P6 manages eight channels independently
  • Grove unified socket enables plug-and-play integration
  • Compact eight-channel design fits space-constrained applications

Eight-channel solid-state relay

The Seeed Studio Grove 8-Channel Solid State Relay uses G3MC202P modules to switch up to 240 VAC loads from a 5 VDC control signal. An on-board STM32F030F4P6 manages each channel independently through an I2C command interface. The solid-state design removes moving parts, giving faster switching and longer service life than electromechanical alternatives. It targets makers and engineers who need reliable AC switching in compact form.

AC-only switching with leakage constraint

The relay operates exclusively with AC loads; a DC load will latch on permanently once activated. Leakage current makes it unsuitable for low-power appliances. Users must observe high-voltage safety precautions and never operate the board while mains power is connected. The Grove unified socket provides plug-and-play connection to compatible microcontroller platforms.

Eight independent channels in one module

Each of the eight channels can be addressed separately via I2C, allowing dense control of multiple AC circuits from a single host. The solid-state construction handles frequent cycling without contact wear or carbon build-up. It is not suited for DC switching, very low-current devices, or applications that require zero leakage current.

Highlights

  • 5 VDC controls up to 240 VAC loads
  • Solid-state switching eliminates contact wear and sparking
  • I2C-driven STM32F030F4P6 manages eight channels independently
  • Grove unified socket enables plug-and-play integration
  • Compact eight-channel design fits space-constrained applications

Specifications

TypeSensors

Questions about this item

Should I pick this 8-channel board or a smaller relay module?

Choose this board when you need to switch up to eight independent AC circuits from one I²C address; a smaller module is enough for fewer loads.

What does the 240 VAC rating mean when the board is installed in a project?

Each channel can switch a mains-voltage AC load up to 240 VAC while being driven from a 5 VDC logic signal.

How does the I²C interface limit the way I connect this relay?

The on-board STM32F030F4P6 receives I²C commands and drives the eight G3MC202P channels, so all switching is controlled over the two-wire bus.

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