Siemens SENTRON 3VA1140-5EF36-0CH0 — 40 A MCCB with 187 kA Interrupting Rating
The Siemens SENTRON 3VA1140-5EF36-0CH0 is a 3-pole molded case circuit breaker (MCCB) rated for 40 A continuous current at 40 °C ambient, with a line protection design and an integrated undervoltage release. Its interrupting capacity reaches 187 kA at 240 V AC, 121 kA at 415 V, and 75.6 kA at 440 V — these figures tell you it handles high-fault-current scenarios typical of industrial mains distribution, not just branch circuits. The breaker carries 2 auxiliary switches plus 1 trip alarm switch (HQ type), so you get both status feedback and a separate alarm contact for remote indication without adding external relays.
What the Ratings Mean for Your Panel Fit
Rated current holds flat at 40 A from 40 °C up to 50 °C, then derates to 39 A at 55–60 °C and 38 A at 65 °C, 37 A at 70 °C — so in a warm enclosure you lose only about 3 A at the top of the operating range. The 187 kA breaking capacity at 240 V means this MCCB can safely clear a fault current up to that level without rupturing or cascading failure upstream — critical for transformer-secondaries or high-capacity bus feeds. Maximum power loss is 13.3 W; in a dense panel that heat adds up, so factor it into your thermal budget if you're stacking multiple breakers in a sealed enclosure.
Mounting and Integration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint that fits SENTRON mounting plates and common DIN-rail adapter bases. The undervoltage release (UVR) is built in, so when control voltage drops below threshold the breaker trips automatically — no separate shunt trip module needed for that function.