3-pole 100 A MCCB with shunt trip — what the ratings mean for your panel
The Siemens SENTRON 3VA1110-4EF32-0JA0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current (Iu) at 40 °C, holding that rating flat through 50 °C before a gentle derating curve — 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, 90 A at 70 °C. That means in a warm enclosure or high-ambient machine room you lose only 10 A at the top end; no need to oversize the frame for marginal thermal headroom. Breaking capacity is the headline number that decides whether this breaker clears a fault without welding its contacts or venting arc gas into the panel. At 240 V it interrupts 121 kA; at 415 V it still handles 75.6 kA; at 440 V it's 52.5 kA; at 690 V it's 11.9 kA. That 121 kA at 240 V covers high-fault utility feeds and transformer secondaries where prospective short-circuit current can exceed 100 kA — common in industrial switchboards and large motor control centers. The overcurrent release is a TM240 thermal-magnetic type — thermal element for overload protection, magnetic instantaneous for short-circuit. No electronic trip unit, no adjustable curve, no communication module. This is a fixed-characteristic breaker for straightforward line protection where selectivity is achieved by cascading frame sizes, not by programming trip curves. The rated insulation voltage Ui is 800 V, so it's suitable for 690 V systems with margin. A built-in shunt trip (STL) allows remote tripping via a control signal — the auxiliary release design is a shunt trip, order code 3VA9688-0BL32 for the integrated auxiliary trip module. There is no undervoltage release, no auxiliary contact, no ground-fault monitoring, no phase-failure detection, and no communication function. This is a clean, basic MCCB with one remote-trip capability; if you need UVR or aux contacts, you spec a different variant or add external modules.
Panel fit and mounting
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. IP40 on the front. Latching endurance is rated at 15,000 operations.