What it is and what it does
The Siemens SENTRON 3VA1110-5EF32-0BC0 is a 3-pole molded case circuit breaker rated 100 A continuous at 40 °C ambient, with a maximum breaking capacity of 187 kA at 240 V AC. Designed for line protection — meaning it sits at the feeder or main distribution point to clear faults before they cascade into branch circuits. The 187 kA figure at 240 V tells you this breaker can interrupt very high fault currents typical of large transformer secondaries or industrial service entrances; at 415 V it still handles 121 kA, and at 690 V it holds 17 kA, so it's suited to 480/277 V and 600 V panels as well. Built with an integrated undervoltage release (UVR) that trips the breaker when supply voltage drops below a set threshold — common in safety circuits that need to drop power on loss of control voltage. Two HQ auxiliary switches provide status feedback to a PLC or indicator lamp without needing an add-on module. Dimensions: 130 mm height, 76.2 mm width (3 inches), 70 mm depth. Fits standard DIN-rail or panel-mount enclosures; the 3-inch width matches the common 3-pole MCCB footprint for easy retrofits.
Sourcing and lifecycle status
Sourced to order against an RFQ here; availability and current pricing confirmed at quote time. If you are filling a panel that was specified around the 3VA1110-5EF32-0AM0 (same frame, different aux configuration), this unit drops in without rewiring — same 3-pole footprint, same 100 A rating, same breaking class. The difference is the UVR and aux switch complement.
Thermal derating and real-world capacity
Rated 100 A from 40 °C through 50 °C ambient — no derating needed up to 50 °C, which covers most ventilated indoor panels. At 55 °C it carries 98 A, at 60 °C it carries 96 A, at 65 °C it carries 94 A, and at 70 °C it carries 91 A. That means in a sealed enclosure or near heat sources, you still get 91 A at the maximum operating temperature of 70 °C. Maximum power loss is 27.5 W, which is moderate for a 100 A frame — helps when sizing enclosure cooling.