Siemens SENTRON 5SP3263-3 — 63 A, 2-Pole Miniature Circuit Breaker with Class E Trip Curve
The Siemens SENTRON 5SP3263-3 is a 2-pole miniature circuit breaker rated at 63 A at AC with a 25 kA breaking capacity per EN 60898. The Class E trip characteristic is designed for cable and line protection in residential and infrastructure installations, where the higher inrush tolerance avoids nuisance tripping on transformer or capacitive loads. Rated for a 400 V AC supply with an insulation voltage of 690 V, it handles overvoltage category IV and pollution degree 3 environments — typical for main distribution panels where the breaker sits close to the utility feed.
Mounting and Integration
Snaps onto standard DIN rail. The 76.3 mm depth and 128 mm height fit standard enclosure cutouts; at 3 modular width units it occupies 54 mm of rail space. Accepts solid or stranded conductors from 2.5 mm² up to 50 mm² via box terminals with saddle clamps. IP40 with conductors connected — fine for enclosed distribution boards but not for washdown areas. The integrated locking slide accepts a padlock, wire seal, or cable tie for lockout/tagout.
Thermal Derating and Environmental Limits
At 30 °C ambient the breaker carries the full 63 A. At 40 °C derate to 59.85 A; at 50 °C to 56.7 A. The operating range spans -40 °C to 70 °C, with shock resistance rated at 30 g for 11 ms — three impacts minimum.