The first and probably the most important shield for our

RS485 MCU Module : RS485 2SSR Shield.

It was designed for local installation under a light switch.

It gives the MCU Module an ability to control AC current with 2 solid state relays.

We decided to go with SSRs since the performance they give is sufficient for most applications (roller shutters, modern LED lighting),

while they allow to achieve very small size of the module.

Moreover it comes with an onboard analog temperature sensor and current sensor.

All this in a very small size of 40x33,5 mm (including RS485 MCU Module).

To use this module you need a RS485 MCU Module.

Technical Specification:

2x snubberless triacs (T435-800B), each controlled by an optotriac

(MOC3043) for optoinsulation,

ACS712-5A analog current sensor,

MCP9700AT analog temperature sensor,

4A SMD fuse for AC line,

AMS1117 5V to power up the logic,

8-pin interface for RS485 MCU Module,

4x screw terminal for RS485 connection (12V, GND, A, B),

3x screw terminal for AC connection (L IN, L Out1, L Out2),

Power consumption (including RS485 MCU Module) < 0.5 W,

Very small size of 40x28 mm.

peak, temporary current output: 4A per channel (note 4A fuse),max load for continuous operation: 200W per module (2 channels with 100W load or 1 channel with 200W load). To determine this values under load tests were carried out.