What it is and what it does
The Siemens 3VA1110-5EF46-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated 100 A continuous at 40 °C, 4-pole, with a TM240 thermal-magnetic release. It's the line-protection variant — no ground-fault monitoring, no communication module, no N-conductor protection. What you get is a straight MCCB for distribution or feeder duty in a 3-phase + neutral panel. The TM240 release means the thermal element is calibrated for a 240 A frame; the 100 A rating is set by the installed trip unit. That gives you headroom if you later need to uprate the breaker within the same frame — swap the trip unit, not the whole device.
Breaking capacity — what it means for your fault level
This breaker delivers 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V. Those numbers are the interrupting capacity at each voltage — the maximum fault current it can safely clear without welding contacts or rupturing the case. For a 100 A MCCB, the 187 kA at 240 V is exceptional; it lets you place this breaker close to a large transformer or on a high-fault bus without needing a current-limiting fuse upstream. The 800 V rated insulation voltage (Ui) confirms the breaker's internal insulation system is designed for 800 V line-to-line.
Thermal derating and panel fit
Rated 100 A from 40 °C up to 50 °C, then derates to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. If your panel ambient runs hot — say, 55 °C inside a sealed enclosure — you lose 2 A; at 70 °C you lose 9 A. Plan your load accordingly. The maximum power loss is 25 W, so forced ventilation may be needed in a tightly packed cabinet. Dimensions are 130 mm high, 101.6 mm wide, 70 mm deep. The 4-pole width (101.6 mm) is standard for a 4-pole MCCB in this frame class; it fits Siemens 3VA mounting bases and busbar systems. IP40 on the front — protected against tools and wires >1 mm, but not against water. Keep it inside a panel, not on the panel door.
Lifecycle and sourcing
The lifecycle stage is listed as current — meaning Siemens still actively manufactures this order code. No phase-out notice, no last-time-buy window. This is the standard production version, not an NRND or obsolete variant.