40 A MCCB with high interrupting capacity for line protection
The Siemens SENTRON 3VA1140-5EF36-0BA0 is a 3-pole molded case circuit breaker rated for 40 A continuous current (Iu) with a TM240 thermal-magnetic overcurrent release. It's configured for line protection — no ground-fault monitoring, no communication module, no auxiliary contacts built in. The interrupting ratings are the headline here: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. That's enough fault-clearing capacity to serve as a main breaker in a high-fault panel without cascading upstream.
Ratings and what they mean for fit
The 40 A rating holds flat from 40 °C through 50 °C — no derating needed in a typical 40 °C panel ambient. At 55 °C it drops 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 your panel runs hot, size the load accordingly. The 800 V rated insulation voltage (Ui) covers most 480 V and 600 V class systems with margin. The undervoltage release (UVR) is factory-fitted — part of the design, not an add-on. It will trip the breaker if control voltage drops below the dropout threshold, which is standard for safety circuits that need a loss-of-voltage shutdown. No trip indicator on the front means you'll need a separate indication circuit if you want local fault visibility.
Panel fit and integration
Dimensions: 70 mm deep, 76.2 mm wide, 130 mm high. The 76.2 mm width (3-inch footprint) is standard for a 3-pole MCCB in this class — it fits a typical DIN-rail or panel-mount cutout without surprises. IP40 on the front means it's protected against tools and solid objects larger than 1 mm; fine for indoor panel use but not for washdown environments. The integrated undervoltage release (3VA9608-0BB11) is wired separately from the main power path; confirm polarity and control voltage before energizing.