The Siemens SENTRON 5SY7340-7CC is a 3-pole miniature circuit breaker rated 40 A at 400 V AC with a C tripping characteristic. It breaks up to 25 kA under IEC 60947-2, which covers most industrial feeder and branch-circuit fault levels. The C-curve means it trips between 5× and 10× rated current — standard for motor-starting and moderate inrush loads in mechanical engineering and industry panels.
Panel fit and mounting
Occupies 3 modular width units (54 mm) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm. The quick-assembly fastening system and any-position mounting simplify rail layout — no top/bottom orientation constraint. IP20 with connected conductors; pollution degree 3 and overvoltage category III suit it for standard control cabinets where condensation and transient overvoltages are expected.
Environmental and compliance
Halogen-free and silicon-free construction, rated for ambient temperatures from -40 °C to 75 °C, with humidity derating above 55 °C. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz. Mechanical service life 10,000 operating cycles typical. Terminal design accepts combined top/bottom feed and accommodates supplementary devices.