The 5SV3444-6: The 40 A rating holds at 40 °C ambient; at 45 °C it derates to 38.1 A, and at 50 °C to 35.59 A. If your panel runs hot, check the derating curve — at 60 °C you're down to 28.19 A, and at 70 °C only 17.6 A. The 100 mA trip threshold suits circuits with higher leakage (e.g., long cable runs, industrial equipment) where a 30 mA device would nuisance-trip. Type A covers pulsating DC faults from electronics, not just pure AC. Instantaneous means no intentional delay — it trips within the standard RCCB response time.
Mounting and space
Snaps onto DIN rail (REG), any orientation. Depth is 70 mm, installation depth the same.