Siemens 5SL6340-7CC — SENTRON 3-pole MCB, C-curve, 40 A
The Siemens 5SL6340-7CC is a SENTRON miniature circuit breaker rated 40 A with a C tripping characteristic, 3 poles, and a 6 kA interrupting capacity per EN 60898 at 400 V AC. It occupies 3 modular width units (54 mm) on a DIN rail and accepts supplementary devices like shunt trips or auxiliary contacts. The 5.1 W power loss per pole at rated current in hot operating state is the figure to check for thermal coordination inside a crowded enclosure. Rated for residential buildings and infrastructure, it handles multi-phase AC circuits up to 440 V and DC circuits up to 72 V. The C-curve trips between 5 and 10 times rated current, making it the standard choice for motor-starting and moderate inrush loads in distribution boards.
Mounting and integration
Mounts on DIN rail in any position, with an installation depth of 70 mm and overall depth of 76 mm. The IP20 rating applies with connected conductors — standard for enclosed distribution panels. Pollution degree 2 and overvoltage category III cover fixed-installation environments. The housing is halogen-free and silicon-free, which matters for clean-room or corrosive-gas applications.
Environmental and compliance
Operates from -40 °C to 75 °C, with vibration resistance of 50 m/s² at 25 to 150 Hz per IEC 60068-2-6. The sealable design allows tamper-proofing in metered or secured installations.