Siemens 5SY7114-8 — SENTRON D-curve MCB, 0.3 A
Tripping characteristic class D. At 0.3 A, this is a control-circuit or instrumentation feeder. At DC per IEC 60947-2 it still holds 15 kA.
Fit, mounting, and panel integration
Snap-on DIN rail mount, 18 mm width (1 modular width unit), 76 mm depth, 90 mm height. Installation depth is 70 mm. Mounting position is any — horizontal, vertical, upside down, doesn't matter for the thermal-magnetic trip. The quick assembly system (fastening method) means it clips onto the rail and engages the busbar without tools. Overvoltage category III and degree of pollution 3 confirm it's rated for fixed installations inside a distribution board or control cabinet.
The 0.3 A rating holds at 35 °C. At 45 °C it derates to 0.27 A, at 50 °C to 0.26 A, at 55 °C to 0.25 A, and at 60 °C to 0.24 A. Operating range is -40 °C to 75 °C, with humidity limits: 95% up to 55 °C, 55% up to 70 °C, 35% up to 75 °C.
Current production. Standard catalog SKU in the SENTRON 5SY series.