What it is and what the ratings mean
The Siemens 3VA1110-5EF36-0BA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a 100 A rated current at 40 °C, with only a 2 A derating by 60 °C (96 A) and down to 91 A at 70 °C — so the thermal curve holds well into a warm cabinet. The 187 kA breaking capacity at 240 V is the headline number; what matters for coordination is that it still delivers 121 kA at 415 V and 75.6 kA at 440 V, meaning this breaker can sit at the main or a high-fault subfeed without cascading upstream. The TM240 overcurrent release is a thermal-magnetic type, fixed at 240 A frame rating — the breaker's continuous current is set by the installed trip unit. This is a 3-pole unit with an integrated undervoltage release (UVR), so it drops out on loss of control voltage — useful for emergency-stop circuits or undervoltage protection on motor feeders. The rated insulation voltage is 800 V, and the maximum power loss is 27.5 W, which matters for enclosure thermal calculations when ganging multiple breakers.
Panel fit and integration
The 3VA1110-5EF36-0BA0 measures 76.2 mm wide by 130 mm tall by 70 mm deep — a standard 3-pole MCCB footprint for DIN-rail or panel-mount installation. The 70 mm depth means it clears most 200 mm deep enclosures with room for wiring gutters. The undervoltage release coil draws from the control circuit; verify polarity and suppression if the panel uses a shared DC supply with other inductive loads.