Standard extension boards might handle your laptop or phone charger, but what about a microwave, heater, or power tools? That’s where heavy duty extension boards come in. Designed for higher current ratings and better durability, these boards are a must-have for power-hungry devices.

What is a Heavy Duty Extension Board?

A heavy duty extension board is built with:

✔ Higher rated sockets (10A, 15A, or even 16A)
✔ Thicker, heavy-gauge copper wires
✔ Flame-retardant or industrial-grade plastic body
✔ Stronger surge protection
✔ Sometimes built-in circuit breakers

These boards are engineered to withstand frequent heavy loads without overheating.

Where Should You Use a Heavy Duty Extension Board?

✅ Kitchens (for microwave ovens, induction cookers, mixers)
✅ Workshops (drills, saws, air compressors)
✅ Living rooms (ACs, high-wattage heaters)
✅ Offices (multiple desktops, printers, routers)

Top Picks for Heavy Duty Extension Boards in 2025

1️⃣ Anchor 16A Heavy Duty Extension Board

  • 2 sockets with 16A switches
  • Heat-resistant body
  • 3-meter thick power cord
  • ISI marked

2️⃣ GM Heavy Duty Spike Guard 3068

  • 4 universal sockets with 16A capacity
  • Surge protection up to 6500A
  • Master switch
  • Overload reset button

3️⃣ Belkin Essential Heavy Duty Series

  • 6 sockets, 16A rating
  • 900-joule surge protection
  • Fire-resistant housing
  • 3-year warranty

Buying Checklist for Heavy Duty Extension Boards

✅ Minimum 16A rated sockets
✅ High-quality copper wires
✅ Flame-retardant casing
✅ Surge protection (at least 900 joules)
✅ ISI/BIS certification
✅ Adequate cable thickness (1.5 sq. mm or more)

Safety First!

⚠️ Never run high-power appliances on a normal 6A extension board
⚠️ Do not daisy-chain even heavy duty boards
⚠️ Ensure proper earthing
⚠️ Switch off when not in use