What it is and what it does
The Siemens SENTRON 3VA2110-5HL36-0DA0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed in a warm enclosure. It carries a maximum interrupting capacity of 187 kA at 240 VAC, dropping to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. The insulation voltage is rated at 800 V. This breaker is designed for line protection and includes an undervoltage release (UVR) as a built-in auxiliary release.
What the ratings mean for fit
The 100 A rating is flat from 40 °C to 70 °C — that means no thermal derating curve to calculate in a hot panel. The 187 kA at 240 VAC is the peak short-circuit rating; at 415/440 V it's still 121 kA, enough for most industrial service-entrance or distribution positions. The 3.7 kA at 690 V tells you this breaker is not intended for 690 V line-side fault duty — it's a 480 V class MCCB used on 400 V or 480 V systems. The 3-pole design covers three-phase loads. The undervoltage release trips the breaker when control voltage drops, standard for motor feeder circuits where loss of control power must disconnect the load.
Where it goes in the panel
Mounts in a standard distribution panel or MCC bucket. Dimensions are 181 mm high, 105 mm wide, 86 mm deep — a 105 mm width means it occupies three 35 mm DIN-rail spaces side by side, though this is a bolt-on MCCB, not a snap-on DIN rail unit. The 12.5 W maximum power loss at rated current matters for thermal management in a sealed enclosure; plan for ventilation or derate the surrounding devices accordingly.