The Siemens 5SL4140-7RC is a 1-pole SENTRON miniature circuit breaker rated 40 A with a C-curve trip characteristic and 10 kA breaking capacity per EN 60898. It's built for residential and infrastructure branch circuits — lighting, general-purpose receptacles, and light motor loads that don't need a D-curve's inrush headroom. The single-pole format means it switches only the phase; neutral is not switched through this device.
The 40 A rating at 240/415 V AC covers most single-phase subfeeds and lighting circuits in commercial and residential panels. Overvoltage category III confirms it's rated for fixed-installation use downstream of the utility meter.
Dimensions are 18 mm wide (1 width unit), 90 mm tall, 76 mm deep with an installation depth of 70 mm — fits any standard distribution board. Wire range accepts 0.75 to 25 mm² solid or stranded copper; torque terminals to 2.5–3 N·m. Sealable, halogen-free, and silicon-free construction suits environments where outgassing or contamination is a concern.