Solid-state relay module
16-channel expansion module providing silent switching with solid-state relays — primarily for controlling lighting and shutters.
Unlike the mechanical relay module, there are no moving parts here: switching is completely silent, click-free, and lifetime is not limited by mechanical wear. In return, a channel can carry a smaller current.
What it is for
Today’s LED lighting circuits typically draw less than 0.3 A — well within the channel’s 2 A limit.
A typical shutter motor draws about 1 A, and only during the 10–20 second movement.
Where several hundred switching operations occur per day, wear-free semiconductor switching is an advantage.
Technical data
| Characteristic | Value |
|---|---|
| Model / code / revision | Solid State Relay board / SM-SSR / Rev. 1.0.3 |
| Channels | 16 solid-state relays (G3MB-202P) |
| Current rating | Max. 2 A / channel, 230 VAC |
| Built-in protection | 2 A fuse per channel and a varistor (MOV) |
| Terminals | Screw terminals, max. 2.5 mm² conductor |
| Power supply | 5 VDC SELV, from the extender port |
| Insulation | Min. 7 mm insulation distance between the 230 VAC side and the control side |
| Compliance | CE, RoHS |
Mechanical or solid-state relay?
| Relay module (SM-RELAY-EXP) | Solid-state relay module (SM-SSR) | |
|---|---|---|
| Current rating | max. 10 A / branch | max. 2 A / channel |
| Switching noise | Quiet click | Completely silent |
| Lifetime | Limited by mechanical wear | No moving parts |
| Typical use | Boiler, larger loads, mixed loads | Lighting, shutter, frequent switching |
Addressing and setup
Addressing and setup in the app are the same as for the relay module: a unique jumper address for every module, and in the app the channel is added with the GPIO Output + I2C expander options.
