The Siemens 5SL4104-7RC is a SENTRON miniature circuit breaker — one pole, C-curve trip characteristic, rated 4 A with a 10 kA breaking capacity per EN 60898 at 415 V AC. The 1-pole design means it switches only the phase — neutral is not broken inside the device, so the panel builder must provide a separate neutral bar. Installation depth is 70 mm into the enclosure; overall depth 76 mm. The 18 mm width (one modular unit) packs tightly on a DIN rail — useful when backpan density is a constraint.
Deployment context — where this lives in a panel
Sealable (padlockable toggle) allows lockout/tagout on the circuit without removing the breaker. The -40 °C to 75 °C operating range covers unheated service entrances and enclosures near process heat; the 75 °C upper limit is the breaker's internal temperature rise plus ambient, not a surface-touch rating.