ABB S271-K2 Miniature Circuit Breaker 1-Pole 2A 277/480VAC DIN Rail MCB

ABB S271-K2 Miniature Circuit Breaker 1-Pole 2A 277/480VAC DIN Rail MCB

The ABB S271-K2 is a single-pole miniature circuit breaker (MCB) from ABB's S271 series, manufactured under the ABB Stotz line and rated for 277/480V AC service. With a K-curve trip characteristic, this breaker is designed to protect circuits where high inrush currents are expected — such as transformer primaries, solenoid valves, and motor control applications — providing delayed response to inrush while responding quickly to sustained overloads and short-circuit faults. The breaker mounts on standard DIN rail and complies with VDE 0660.

Specifications & What's Included

• Model: ABB S271-K2
• Manufacturer line: ABB Stotz (S271 Series)
• Number of poles: 1 (single-pole)
• Amperage rating: 2A
• Trip curve: K (high inrush, delayed magnetic trip)
• Voltage rating (AC): 277/480V AC (label: 240/415V nominal; back label confirms 277/480V AC)
• Maximum DC voltage: 440V DC (U max, per rear label)
• Interrupting capacity: 6,000A (6kA)
• Mounting: Standard DIN rail
• Standards compliance: VDE 0660
• Certifications: UL (E76126), OVE, NF, BD 6
• Includes: Circuit breaker only (single unit)

Applications

The ABB S271 series is widely used in industrial control panels, machinery protection circuits, and building electrical distribution systems where DIN rail mounting is standard. The K-curve characteristic makes this breaker well-suited for protecting circuits with high startup inrush — including transformer primaries, control transformers, solenoid coils, and small motor starters — where a standard B- or C-curve breaker would nuisance-trip on normal inrush. The 277/480V rating makes it appropriate for both North American 480V three-phase systems and European 240/415V installations. It is commonly found in OEM equipment panels, machine tool enclosures, and industrial automation cabinets globally.