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.
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. 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.