It's built for railway applications and general mechanical engineering and industry use.
The 0.3 A rating is low; this breaker protects a control transformer secondary or a small signal supply, not a main power feed. The 35 kA figure under 60947-2 gives you headroom on high-fault industrial panels where the prospective short-circuit current exceeds 10 kA. Temperature derating is published for the full range: 0.3 A at 35 °C, 0.29 A at 40 °C, 0.28 A at 45 °C, 0.27 A at 50 °C, 0.26 A at 55 °C, and 0.25 A at 60 °C. If your panel ambient runs 50 °C, size for 0.27 A continuous. Mounts in any position via the quick assembly system.
Snap-on DIN rail mounting with combined terminals top and bottom — wire incoming and outgoing on the same side if needed. Sealable for tamper-proof installations. Halogen-free and silicon-free construction reduces outgassing in sensitive environments like medical or clean-room panels.