TOMZN 4P 80A Circuit Breaker DIN Relay (TOWBC-4P-e)
TOMZN 4P 80A Circuit Breaker

Available from:


Install method:
USB to Serial

GPIO #Component
GPIO00 Button 1
GPIO01 None
GPIO02 None
GPIO03 None
GPIO04 None
GPIO05 None
GPIO09 None
GPIO10 None
GPIO12 Relay 1
GPIO13 Led 1
GPIO14 None
GPIO15 None
GPIO16 None
GPIO17 None

The device opens with tabs at the top or bottom; it’s a tight fit, but there is no glue. Newer versions additionally have four small philips screws are accesible with a thin screwdriver from back side, no glue. PCB is screwed in with two small screws.

The wifi board is screwed to the front, and does not have any allowance for serial flashing. You’re going to have to solder tails to the usual 4 pins (+3, gnd, tx, rx). Fortunately, the button is on GPIO0, so you just have to hold that button during powerup.

The red LED seems to be tied to the relay, so that it lights when the relay is active. The green LED is on GPIO13, and is active-low.