What this MCCB is and what it does
The Siemens 3VA2110-5HL32-0JH0 is a SENTRON molded case circuit breaker (MCCB) in the line protection version, meaning it is configured to protect cables and busbars against overload and short-circuit — not motor or generator circuits. Rated continuous current Iu is 100 A, and the breaker carries a 3-pole configuration for three-phase systems up to 800 V rated insulation voltage. The overcurrent release is an ETU320 electronic unit, which provides adjustable long-time, short-time, instantaneous, and ground-fault protection curves (the ground-fault monitoring version here is listed as without).
Breaking capacity — what the numbers mean for your fault duty
Breaking capacity is the maximum fault current the breaker can safely interrupt at a given voltage without welding or rupturing. At 240 V this MCCB is rated for 187 kA — a very high figure that covers most low-voltage transformer-fed fault duties. At 415 V and 440 V it holds 121 kA, dropping to 79 kA at 500 V. At 690 V the rating is 4.25 kA, which still covers the typical fault current on a 690 V distribution board but is not a high-interrupting rating at that voltage. For a 400 V panel fed by a large transformer, 121 kA is well above the typical available fault current of 50–65 kA, so this breaker gives headroom without needing a current-limiting upstream device.
Thermal derating and ambient temperature
The 100 A rating holds flat from 40 °C through 50 °C ambient. At 55 °C it derates to 96.25 A, at 60 °C to 92.5 A, at 65 °C to 88.75 A, and at 70 °C to 85 A. If the breaker lives in a hot enclosure — say a non-ventilated panel near a furnace line — you need to account for that derating at the design stage. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Auxiliary contacts and shunt trip — what is built in
The breaker ships with an auxiliary contact block configured as 2 auxiliary switches plus 1 trip alarm switch (HQ designation). That gives you two form-C contacts for status feedback (open/closed) and one dedicated contact that changes state only when the breaker trips on fault — useful for remote alarm annunciation. A shunt trip release (STL) is integrated, allowing remote tripping via a control voltage. The integrated auxiliary trip module is order code 3VA9688-0BL32. The basic switch (the breaker mechanism without auxiliaries) is 3VA2110-5HL32-0AA0.
Dimensions and panel fit
Width is 105 mm, height 181 mm, depth 86 mm. That 105 mm width is standard for a 100 A frame in the SENTRON 3VA2 series — three pole widths at roughly 35 mm per pole. Depth of 86 mm includes the mechanism but not the handle throw arc; verify clearance in front of the panel for the toggle to swing. The breaker mounts via four screws to a mounting plate or directly to a DIN rail adapter (not included in this order code).