Eaton FAZ-K4/1 Miniature Circuit Breaker 1-Pole K-Characteristic 4 A 6 kA 278594

Electricians and panel builders use the Eaton FAZ-K4/1 miniature circuit breaker to protect circuits with high inrush currents, such as motors, transformers, and control transformers. This 1-pole MCB with K-characteristic trips at 8–12 times rated current, preventing nuisance tripping while providing reliable short-circuit protection.

Key specifications

• Number of poles: 1
• Rated current: 4 A
• Tripping characteristic: K
• Rated voltage: 230/400 V AC
• Rated switching capacity: 6 kA according to EN 60898
• Frequency: 50/60 Hz
• Mounting: DIN rail (EN 60715)
• Module width: 1 TE (17.5 mm)
• Degree of protection: IP20 (terminals), IP40 (front)
• Terminal type: screw terminals
• Terminal capacity: 1–25 mm² (solid/stranded)
• Energy limitation class: 3
• Ambient operating temperature: -25 to +75 °C
• Standards: EN 60898-1, IEC 60898-1
• Connection position: top and bottom

Why choose it

This MCB is engineered for demanding industrial environments. Its K-characteristic ensures reliable protection for equipment with high inrush currents, while the 6 kA breaking capacity handles typical short-circuit levels in distribution boards. The compact 1-module design saves space on the DIN rail.

Ideal use cases

• Motor circuit protection
• Transformer and control transformer protection
• Industrial control panels
• Distribution boards in commercial buildings

Good to know

The FAZ-K4/1 features screw terminals for secure wiring and can be connected from either top or bottom. It operates reliably across a wide temperature range, making it suitable for various installation environments.