ABB S271-K4 Miniature Circuit Breaker 1-Pole 4A K-Curve 240/415V 6kA DIN Rail

ABB S271-K4 Miniature Circuit Breaker 1-Pole 4A K-Curve 240/415V 6kA DIN Rail

The ABB S271-K4 is a 1-pole miniature circuit breaker (MCB) from ABB's S200/S271 series, rated at 4 amperes with a K trip curve. It is DIN rail mountable and rated for 240/415V AC systems, with a 6kA (6,000A) short-circuit interrupting capacity. The K-curve characteristic provides a high magnetic tripping threshold, making it well-suited for protecting circuits with high inrush currents.

Specifications & What's Included

• Manufacturer: ABB (Stotz-Kontakt division)
• Model: S271-K4 (S200 series)
• Type: Miniature Circuit Breaker (MCB)
• Number of Poles: 1
• Current Rating: 4A
• Trip Curve: K (high magnetic threshold — suitable for motor/transformer/inductive load protection)
• Voltage Rating: ~240/415V AC (equivalent to ~277/480V in U.S. systems)
• Interrupting Capacity: 6kA (6,000A)
• Mounting: DIN rail (35mm)
• Certifications: SK (Stotz-Kontakt), UL listed marking visible
• Includes: Breaker only — no accessories or documentation

Applications

The ABB S271 series is a widely used line of DIN rail-mounted miniature circuit breakers found in residential, commercial, and light industrial electrical panels throughout Europe and internationally. The K-curve variant is specifically designed for circuits with high inductive inrush currents, such as those feeding small motors, control transformers, solenoids, and similar loads, where a standard B- or C-curve breaker might nuisance-trip on startup. At 240/415V it is compatible with both single-phase and three-phase distribution systems common in European and IEC-standard installations, and is also used in U.S. applications wired to 277/480V systems where IEC-rated components are specified. ABB's S200 series has been a standard reference in IEC 60898-compliant panel design for decades and remains in active production and widespread service use today.