Single-Floor Pilot — Live Circuit Demo

C-20 Godrej Retreat, Sec 83 · 2nd Floor sub-DB · Built up one piece at a time — the full working circuit is at the bottom
1

The control core — signal → contactor → AC

Just three things: the inverter's signal wire, the contactor it drives, and the AC it switches. Nothing else yet.
Inverter signal:
TERRACE Inverter signal out 230V LIVE RED signal wire → coil A1 Supply phase (L) Schneider Acti9 iCT · A9C20732 1 2 COIL A1·A2 AC (load)
Signal LIVE: 230V on the red wire energizes the coil (A1–A2). The coil becomes an electromagnet and pulls the moving contact shut, bridging poles 1→2 — so supply phase flows straight through to the AC and it runs. Flip the signal DEAD and watch the coil drop, the contact spring open, and the AC stop.
2

Add the override — a manual way to force the AC on

Same circuit as before, plus a push-button + timer relay that feeds the coil directly — so a floor can keep its AC even when the signal is dead.
Inverter signal:
TERRACE Inverter signal out 230V LIVE RED signal wire → coil A1 Supply phase (L) Schneider Acti9 iCT · A9C20732 1 2 COIL A1·A2 NEW: Override PUSH --:-- timer relay — holds coil live 4 hr AC (load)
Try it: set the signal DEAD — the coil drops and the AC stops, just like Section 1. Now press override: the push-button feeds the coil directly through the timer relay, so the coil re-energizes, the contacts close, and the AC comes back on — even with a dead signal. The timer holds it for 4 hours, then releases it back to automatic.
3

Everything together — the full working circuit

All parts combined: grid/inverter supply, MCB protection, signal automation, the override from Section 2, battery drain and automatic load-shedding.
Supply:
Battery %: 85%
Live / phase (230V)
Neutral
RED signal wire (control)
De-energized
Energized + current flowing
TERRACE — INVERTER INVERTER 10 kW BATTERY 85% Signal output: LIVE (230V) signal terminal RED 1.5 sqmm signal wire — down shaft → coil A1 2nd FLOOR SUB-DB Grid phase (L) MCB · ON Schneider Acti9 iCT · A9C20732 1 2 COIL A1 · A2 AC (load) NEUTRAL BUSBAR 1 — direct grid (geyser) Neutral busbar 2 (inverter-backed) Override PUSH --:-- timer relay — forces coil live 4 hr
✅ Normal — coil energized, contacts closed, AC running
Grid present. The 230V signal on the RED wire energizes the contactor coil (A1–A2). The coil's magnet pulls the moving contact shut, bridging poles 1→2, so grid phase reaches the AC.

The control chain

  1. Inverter puts 230V on the RED signal wire when battery is healthy.
  2. Signal reaches coil terminal A1; A2 returns to neutral → coil is energized.
  3. Energized coil = electromagnet → it pulls the moving contact against poles 1 & 2.
  4. Contacts closed → grid phase flows through to the AC. It runs.
  5. Battery ≤30% in an outage → inverter removes the signal → coil de-energizes → spring pushes contacts open → circuit breaks → AC off.
  6. Push-button feeds the coil directly for 4 hr, overriding a dead signal.
Why the MCB, if it's always on? It isn't a switch for daily use — it's protection. The contactor does the automatic switching (open/close many times a day on the signal). The MCB stays closed and only breaks the circuit on a short-circuit or overload, and gives the electrician a safe manual isolation point to work on the AC circuit. Hit "Simulate AC fault" to see it trip and cut power upstream of the contactor.
Schematic simulation for the pilot — single-line, timings compressed (real override = 4 hours). One AC pole shown for clarity.