Which rating is used in a home?

Lighting circuits usually use 10 A with 1.5 mm² cable and socket circuits 16 A with 2.5 mm² cable; dedicated circuits for ovens or air conditioners may use 20–25 A depending on the cable. The cable cross-section decides: the breaker must not be larger than the current the cable can carry. Local wiring rules apply.

Should I choose curve B or C?

Curve B for lighting and socket circuits and long cable runs; curve C for motors, compressors, air conditioners, pumps and other loads with high inrush current. When replacing an existing breaker, check the letter printed on it (B16, C16, etc.) and choose the same.

Is a 4.5 kA breaking capacity enough?

For most homes and small businesses, 4.5 kA is sufficient. Buildings close to a transformer or industrial panels with high short-circuit current may need higher breaking capacities (6 kA, 10 kA); this is specified in the installation design.

Why does my breaker keep tripping?

The most common causes are overload (too many appliances on one circuit), a short circuit in an appliance, or a curve B breaker on a load with high inrush current. Fitting a larger breaker is not the solution – the cable can overheat. If you cannot find the cause, have the installation checked by an electrician.

Single-Phase Circuit Breaker 6–63 A, Curve B and C – Legrand XS4 (1-Pole)

Name: Single-Phase Circuit Breaker 6–63 A, Curve B and C – Legrand XS4 (1-Pole)
Brand: Legrand
SKU: LEGRAND-XS4-1K
Price: 3.90 USD
Availability: InStock

Authorised Legrand dealer

$3.90VAT included

Price converted at the Central Bank of Türkiye rate of Oct 16, 2026.

Legrand XS4 1-pole (single-phase) miniature circuit breaker: 6, 10, 16, 20, 25, 32, 40, 50 and 63 A, curve B or C, 4.5 kA breaking capacity, 1 module. Protects home and business circuits against overload and short circuit.

Tripping Curve: Curve C

Rated Current: 16 A

In stockSKU: 433329

We currently ship to Türkiye only. Sales to other countries will start soon.

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A single-phase miniature circuit breaker (MCB, 1-pole) protects each circuit in a home or business: it cuts the power on overload or short circuit to protect the cable and the appliances. The Legrand XS4 1-pole breaker comes in nine ratings from 6 A to 63 A with curve B or C, works on 230/400 V networks and takes up 1 module (17.5 mm) in the panel.

Legrand XS4 is a new generation of miniature circuit breakers made at Legrand's Gebze factory in Türkiye. It has a breaking capacity of 4,500 A (4.5 kA) to EN/IEC 60898-1, energy limiting class 3 and an electrical life of 10,000 operations, and works from −25 °C to +70 °C. On ratings above 25 A the terminals take cables up to 35 mm² and can be tightened with flat or Phillips screwdrivers. The red/green marking on the toggle always shows whether the contacts are open or closed, and the two-position DIN rail clip makes fitting and removal easy. The breaker can be supplied by busbar from the top or bottom and accepts Legrand auxiliaries such as auxiliary contacts, fault signal contacts and shunt trips. TSE certified.

The difference between curves B and C is how quickly the breaker trips on a sudden high current. Curve B trips instantly at about 3–5 times the rated current and suits lighting, sockets and long residential circuits. Curve C trips at 5–10 times and prevents nuisance tripping on motors, compressors, air conditioners and other loads with high inrush current. Curve C is common in Turkish homes; the right choice depends on the installation design.

The rating of a breaker is chosen according to the cross-section of the cable it protects: if the breaker is larger than the cable can carry, the cable overheats. Our guide explains cable sizes and breaker selection in detail; if in doubt, ask the electrician who installs the system.

As an authorised Legrand dealer we ship genuine products; orders are dispatched within 1–3 business days. You can also collect from our store in Bursa.