What this MCCB carries — and what it leaves out
The Siemens SENTRON 3VA1140-5EF36-0HA0 is a 3-pole molded case circuit breaker (MCCB) rated for 40 A continuous current (Iu) with a rated insulation voltage of 800 V. It uses a TM240 thermal-magnetic overcurrent release — fixed thermal and magnetic trip settings, no electronic adjustment. Breaking capacity runs 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V, which covers most industrial distribution panels up to 690 V line-to-line. This is a line-protection variant — no ground-fault monitoring, no phase-failure detection, no communication module, and no auxiliary contacts. The only integrated auxiliary release is a shunt trip (STL) with order code 3VA9688-0BL30. If your BOM calls for under-voltage release or an alarm contact, this isn't the variant.
Thermal derating matters above 55 °C
The 40 A rating holds flat from 40 °C to 50 °C ambient. At 55 °C it derates to 38.4 A, at 60 °C to 37.6 A, at 65 °C to 36.8 A, and at 70 °C to 36 A. If the panel ambient runs hot — say, a sealed enclosure near a furnace line — you're losing 4 A by the time you hit 70 °C. Size the breaker for the actual enclosure temperature, not the nameplate.
No trip indicator, no aux contacts — plan your panel wiring
This MCCB lacks a trip indicator and has no auxiliary contact block. If the PLC needs a remote tripped signal, you'll need to add an external auxiliary switch or monitor the shunt trip circuit. The front IP40 protection is fine for a clean indoor panel but not for washdown areas. Dimensions: 130 mm height, 76.2 mm width, 70 mm depth — fits standard SENTRON 3VA mounting footprint.