In a 4-loop stabilizer transformer, there are usually 4 different voltage taps provided to the PCB so that the microcontroller can select the correct tap (via relays) depending on the input voltage.

Since you asked starting from 90V, the taps are normally kept in equal or practical steps so that the stabilizer can boost voltage gradually.

👉 A common set of 4 taps (for a stabilizer starting at 90V) would be like this:

  1. 90V tap – lowest input working limit

  2. 110V tap – low input range boost

  3. 130V tap – medium boost

  4. 150V tap – high input (near normal range, minimal boost)

After 150V input, the stabilizer usually bypasses the transformer (direct supply mode) if voltage is already good (like 170V–270V).

⚡ But note:

  • Different companies/designs may keep slight variations (like 95-115-135-155 or 100-120-140-160).

  • The PCB is designed to sense input voltage and accordingly switch to one of these taps.

Do you want me to also give you a 5-loop and 7-loop common tap chart for comparison? That way you’ll see how companies step them up.

Also

Perfect 👍 Let’s break it down step by step.

A stabilizer transformer has multiple taps (loops), and the PCB selects them through relays depending on input voltage.
The number of taps (4-loop, 5-loop, 7-loop etc.) defines how finely the stabilizer can boost voltage.

🔹 Common Tap Voltages (Starting from ~90V)

✅ 4-Loop Stabilizer (basic boost)

  1. 90V

  2. 110V

  3. 130V

  4. 150V
    ➡ After ~170V input, direct bypass (no boost).

✅ 5-Loop Stabilizer (slightly finer steps)

  1. 90V

  2. 110V

  3. 130V

  4. 150V

  5. 170V
    ➡ Beyond ~180–190V, direct bypass.

✅ 7-Loop Stabilizer (more accurate regulation)

  1. 90V

  2. 105V

  3. 120V

  4. 135V

  5. 150V

  6. 165V

  7. 180V
    ➡ Beyond ~190–200V, direct bypass.

⚡ Key Point:

  • Lower loops (90–120V range) give maximum boost.

  • Middle loops (130–160V) give moderate boost.

  • Higher loops (170–180V+) are nearly bypass levels.

  • Companies can adjust these a little, but the pattern remains similar.

👉 Do you also want me to explain how these taps actually step-up voltage (e.g., 90V → output ~220V) with turns ratio, or just need the tap lists?