What this MCCB is and what it does
The Siemens 3VA1110-5EF32-0KA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous current rating of 100 A at 40 °C, holds that rating through 50 °C, and derates to 91 A at 70 °C — so for most panel environments below 50 °C it delivers full rated current without headroom loss. The 3-pole construction and 800 V rated insulation voltage suit it for 400/480 VAC three-phase systems common in industrial and commercial switchboards.
Breaking capacity — what the numbers mean for your fault duty
The interrupting ratings span the voltage range a panel sees in practice: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500/690 V. At 415 V — the common low-voltage distribution level outside North America — 121 kA covers high-fault scenarios like transformer secondaries or large motor contribution. The 17 kA at 690 V is still adequate for most industrial 690 V drives and bus feeds, but verify against your transformer impedance if the available fault current is higher.
Release and auxiliary options
This MCCB ships with a TM240 thermal-magnetic overcurrent release — fixed thermal and magnetic trip settings, no electronic adjustment. The auxiliary release is a shunt trip (STL), which lets a remote signal (e.g., emergency stop, fire alarm, undervoltage relay) open the breaker. There is no undervoltage release on this variant, so if you need UVR for motor starter coordination, look at the -0LA0 sibling. The unit has no trip indicator, no communication function, and no ground-fault monitoring — it is a straight line-protection breaker for standard distribution.
Physical fit and panel integration
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that fits most Siemens SENTRON panelboards and third-party enclosures with DIN-rail or bolt-on mounting. The 25 W maximum power loss at full load means ventilation slots in the enclosure cover are sufficient; no forced cooling required in a typical 40 °C ambient. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C.