The SENTRON 5SY3040-7KV is a 1+N-pole miniature circuit breaker with a C-curve trip characteristic rated at 40 A. It breaks fault currents up to 4.5 kA at 230 V AC, which is the standard interrupting rating for residential and light commercial distribution boards per EN 60898.
Panel integration
The 5SY3040-7KV mounts on a standard DIN rail (EN 60715) and occupies one modular width unit (18 mm). Installation depth is 70 mm, which matches the SENTRON 5SY series footprint — it drops into the same panel cut-out as the 5SY3025-7KL or 5SY3132-6 without rewiring the busbar or altering the enclosure layout. The 1+N-pole design switches both phase and neutral, with the neutral pole switching but not protecting; this is typical for single-phase final circuits where the neutral must be disconnected for isolation.