Voltage Stabilizers & Automatic Voltage Regulators (AVR) in Bangladesh

Factories in Gazipur, Narayanganj, Chattogram and Savar regularly face phase imbalance, high-voltage surges and long brownouts. On unstable voltage, CNC machines, injection moulding presses and jacquard looms suffer motor burnouts and controller failures. An automatic voltage regulator (AVR), also called a servo voltage stabilizer, corrects the incoming voltage before it reaches your equipment. TNS Engineering supplies single-phase and three-phase stabilizers across Bangladesh, from small units for medical analysers and home electronics up to 5000kVA for full factory distribution.

Stabilizer range

Single phase

• Howa Power SR series: 500VA, 1000VA, 1500VA, 2000VA, 3000VA, 5000VA, 8000VA, 10kVA, 15kVA, 20kVA, 30kVA, 40kVA, 50kVA.
• T-Mux (SAKO) SVC series: 500VA, 1000VA, 1500VA, 2000VA, 3000VA, 5000VA, 7500VA, 10kVA, 15kVA, 20kVA, 30kVA, 40kVA, 50kVA.

Three phase servo: Howa Power ADV series

80kVA to 5000kVA. Listed models include ADV-80, 100, 150, 200, 250, 300, 350, 400, 500, 550, 600, 650, 700, 750, 800, 1000, 1500, 2000, 3000, 4000 and 5000kVA.

TNS series 4.5–100kVA (T-Mux SAKO)

Three-phase AVRs with independent phase regulation at 4.5, 7.5, 10, 15, 20, 30, 40, 60, 75 and 100kVA.

Industrial SBW & SBW-F series (T-Mux SAKO)

• SBW series: three-phase (3P+N), individual phase control with stepless servo-motor regulation. Listed from 100kVA (100, 120, 150, 200, 250, 300, 350, 400, 500, 600, 800, 1000kVA).
• SBW-F series: 180, 225, 250, 320, 400, 500, 600, 800, 1000, 1200, 1600 and 2000kVA.

How to size a stabilizer

1. Add up the kVA of every load the stabilizer will feed.
2. For induction motors, allow for starting inrush (3× to 5× running current). Size the stabilizer at a minimum of 2× to 2.5× the combined motor rating.
3. Check whether your site has uneven phase loading. If it does, choose independent three-phase regulation, where three servo motors balance each phase separately.
4. Leave headroom for expansion. Our engineers can measure your incoming voltage and size the unit on site. → Factory power backup

Servo vs relay type

Servo motor stabilizers give stepless, continuous regulation with no clicks, sparks or step changes that can upset sensitive electronics. Relay-type regulators switch in steps and suit smaller, less sensitive loads. T-Mux (SAKO) makes both types. For factories and precision machinery, we generally recommend servo.

Brands

• Howa Power: German brand under an authorised manufacturing partnership, exclusively distributed in Bangladesh by TNS. Covers the SR single-phase and ADV three-phase series.
• T-Mux (SAKO): made by Zhejiang Sanke New Energy Co., Ltd. TNS is the authorised partner. Covers the SVC, TNS, SBW and SBW-F series.

FAQ

Why choose a servo stabilizer over a relay type? A servo stabilizer corrects voltage smoothly and continuously, with no stepping. That protects microprocessors and precision controllers.

What is independent three-phase regulation? When phases are loaded unevenly, one phase may drop to 180V while another sits at 230V. Independent regulation uses three servo motors to bring each phase back to 220V/380V on its own.

What capacity do I need for motor loads? Motor starting current can reach 3× to 5× the running current. Size the stabilizer at a minimum of 2× to 2.5× the combined motor rating.

Which brands of AVR does TNS supply? Howa Power and T-Mux (SAKO).

Do you show prices? No. Prices depend on the capacity and the site, so call 01613215054 for a quotation.

Need on-site voltage checks or a quotation? Request a quote Hotline 01613215054 · 24/7 emergency +8801713215065 · Landline +8802-224405145