What this MCCB is and what it protects
The Siemens 3VA1110-6EF36-0BA0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection — the primary role is protecting cables and distribution bus from short-circuit and overload in a main or feeder panel. Rated 100 A continuous at 40 °C through 50 °C, it derates to 91 A at 70 °C, so the ampacity selection must account for the enclosure ambient — not just the breaker label. The interrupting capacity is the standout: 220 kA at 240 V, 154 kA at 415 V, and still 121 kA at 440 V — this is a high-fault-rated MCCB meant for large transformer secondaries or industrial switchboards where available fault current is high. It carries an undervoltage release (UVR) as standard, so if control voltage drops, the breaker trips — common in safety circuits or emergency-stop chains that need a loss-of-voltage shutdown.
Current ratings and thermal behaviour
The overcurrent release is a TM240 — a thermal-magnetic unit with a 240 A frame rating, but the breaker itself is calibrated for 100 A continuous at 40 °C ambient. Above 50 °C the continuous current drops linearly: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, 91 A at 70 °C — the thermal trip element responds to internal heat plus ambient, so a hot panel reduces the usable rating. Maximum power loss is 27.5 W — relevant for enclosure thermal calculations when grouping multiple breakers.
Physical fit and panel integration
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth — fits standard SENTRON 3-pole MCCB footprint for DIN-rail or screw-mount panel installation. The 3VA1110-6EF36-0BA0 includes an undervoltage release module integrated; no separate accessory needed for UVR functionality. No communication function or ground-fault monitoring on this variant — it is a plain line-protection MCCB with thermal-magnetic trip.