Shelly 2PM Gen4 and Gen3 wiring diagram

Every job, terminal by terminal

The Shelly 2PM Gen3 is wired the same way as the Shelly 2PM Gen4.

1. Switch two lights

   Two circuits, one relay

   Each channel is its own switched, metered circuit: O1 carries the first light, O2 the second, and the wall switches land on S1 and S2. Mains comes in once on L and N and feeds both.

   Terminals for switch two lights on the Shelly 2PM Gen4

   Terminal	What it does here
   O1	Switched, metered active out to the first light
   O2	Switched, metered active out to the second light
   S1	Wall switch for channel 1
   S2	Wall switch for channel 2
   L	230 V active in (either L terminal)
   N	Neutral in

   Supply: 230 V~ 50 Hz

2. Drive a roller shutter or awning

   Cover mode — one motor, two directions

   In cover mode the relay drives the motor one way at a time: O1 and O2 each feed one winding, and the motor's common returns to neutral. If the motor runs the wrong way, turn on Reverse directions before calibrating. S1 and S2 take optional open and close buttons. Use a motor with its limit switches set before connecting it.

   Terminals for drive a roller shutter or awning on the Shelly 2PM Gen4

   Terminal	What it does here
   O1	One motor winding
   O2	The other motor winding
   N	Neutral in, also the motor's common return
   L	230 V active in (either L terminal)
   S1	Optional open button
   S2	Optional close button

   Supply: 230 V~ 50 Hz

3. Run a bathroom light and exhaust fan

   Light on O1, fan on O2

   The light and the exhaust fan each get their own channel, so the relay knows when the light goes off and can keep the fan running long enough to clear the steam. O1 feeds the light, O2 the fan, and the two wall switches land on S1 and S2. Active feeds both L terminals, as Shelly's ANZ diagram shows. The fan is an inductive load, which Shelly's ANZ load list qualifies as needing an RC snubber, so that is one for your electrician.

   Terminals for run a bathroom light and exhaust fan on the Shelly 2PM Gen4

   Terminal	What it does here
   O1	Switched, metered active out to the light
   O2	Switched, metered active out to the exhaust fan
   S1	Light switch
   S2	Fan switch
   L	230 V active in, to both L terminals
   N	Neutral in

   Supply: 230 V~ 50 Hz