Siemens 3VA1140-3EF36-0KH0 — 40 A SENTRON MCCB for Line Protection
Thermal-magnetic trip is factory-set for line protection.
Breaking Capacity Across Voltages — Selectivity Planning
Interrupting rating drops from 75.6 kA at 240 V to 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V.
Current Rating vs. Ambient Temperature
At 55 °C it derates to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A. In a crowded panel with multiple breakers ganged, the 70 °C derated figure (37 A) is the one to use for NEC 310.15(B)(2)(a) ampacity calculations — not the catalog 40 A.
Physical Fit and Auxiliary Options
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that fits most Siemens SENTRON panelboards and third-party enclosures with DIN-rail or bolt-on mounting.