Circuit Breakers & Breaker Panels

Circuit Breakers & Breaker Panels at OneStockHome

OneStockHome stocks the full range of circuit breakers and breaker panels from top brands — Schneider, ABB, Mitsubishi, Panasonic, Square D, Haco, Safe-T-Cut — including MCBs, MCCBs, RCBOs, RCCBs, main breakers, 3-phase breakers, and consumer units (load centers). Factory prices, nationwide delivery in Thailand, full VAT invoice, 100% genuine guarantee.

What is a circuit breaker?

A circuit breaker is an automatic electrical switch designed to protect a circuit from damage caused by overcurrent, short circuit, or earth leakage. Unlike a fuse, a breaker can be reset and reused after it trips. Every electrical installation in a home, office, or factory relies on circuit breakers as the first line of protection for wiring, equipment, and people.

Types of circuit breakers

1. MCB — Miniature Circuit Breaker

Compact branch breakers rated 6–125A, used in residential consumer units to protect individual circuits against overload and short circuit.

2. MCCB — Molded Case Circuit Breaker

Higher capacity (16–1,600A) breakers for commercial buildings, factories, and 3-phase main panels.

3. RCBO / RCCB — Residual Current Devices

Breakers that trip on earth leakage to prevent electric shock. Required for wet areas (bathrooms, water heaters). RCBO combines overcurrent + earth leakage protection in one unit; RCCB handles earth leakage only.

4. ACB — Air Circuit Breaker

Large breakers rated 630–6,300A for industrial low-voltage distribution.

How to size a circuit breaker

• Small residential (5(15)A meter) — 30–50A main breaker
• Medium residential (15(45)A meter) — 63A main, 16–32A branches
• Large / 3-phase residential (30(100)A meter) — 100A 3P main breaker
• Factory / commercial — MCCB or ACB sized to calculated load

Quick rule: sum the wattage of all loads, divide by 220V (single phase) or 380V (3-phase), then choose the next standard breaker rating roughly 1.25× the calculated current.

Top circuit breaker brands

• Schneider Electric — French global brand. Easy9, Acti9, Domae ranges.
• ABB — Industrial-grade quality. SH200, S200, Tmax ranges.
• Mitsubishi — Japanese industrial breakers. BH-D, NF ranges.
• Panasonic — Value-priced residential breakers and consumer units.
• Haco / Safe-T-Cut — Thai brands, TIS-certified, budget-friendly.
• Square D — American-engineered, heavy duty.

FAQ

What’s the difference between a breaker and a safety cut?

A “safety cut” in Thai usage refers to an RCBO/RCCB earth-leakage breaker that prevents shock. A standard MCB only trips on overload or short circuit. For full protection, install both.

What can a single breaker power?

Depends on amperage — 16A for standard outlets, 20–32A for air conditioners and water heaters, 32–50A for electric stoves and high-draw appliances.

Why does my breaker keep tripping?

Common causes: overload, short-circuited appliance, damaged wiring, or aged breaker. Have an electrician inspect your panel every 3–5 years.

Order from OneStockHome

Shop circuit breakers and panels at factory prices with nationwide Thailand delivery, VAT invoice, and free sizing consultation from our technical team.