The Siemens SENTRON 3VA2125-6KQ36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 25 A continuous current on a 300 A frame, designed for line protection in distribution panels and motor control centers. Its interrupting capacity hits 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V — so the SCCR you need governs which voltage level you design around.
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep — fits standard MCCB panel cutouts with room for adjacent breakers. Operating temperature range -25 °C to 70 °C; storage from -40 °C to 80 °C — fine for unheated warehouses and outdoor enclosures within spec.