What it is and what it does
The Siemens 3VA2010-8JQ32-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous current rating of 100 A across the full ambient temperature range from 40 °C to 70 °C, meaning no derating is needed as the panel warms up — a practical advantage when the breaker sits near other heat sources in a crowded enclosure. Breaking capacity is the headline spec here: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. Those are high-interrupting ratings for a 100 A frame — this breaker handles fault currents that would vaporize a standard industrial MCCB. It is sized for strong transformer-fed services or large motor-control-center feeders where available fault current is well above 100 kA.
Panel fit and integration
The 3VA2010-8JQ32-0AA0 measures 86 mm deep, 105 mm wide, and 181 mm tall — a 3-pole frame that fits standard MCCB mounting footprints in switchgear and panelboard layouts. The 105 mm width per pole is typical for this class; verify the bus-bar spacing and phase barriers in your existing panel before committing the BOM line. Maximum power loss is 7.7 W, which is modest for a 100 A MCCB. In a sealed, non-ventilated enclosure with multiple breakers, that loss figure helps calculate internal temperature rise and whether forced ventilation is needed.
What the ratings mean for the buyer
The 100 A continuous rating is flat across the 40–70 °C operating range — no thermal derating curve to manage. That is unusual for an MCCB; most frames lose capacity above 40 °C. Here, the breaker delivers its full 100 A even at 70 °C ambient, which simplifies panel thermal design. Ground-fault monitoring is configured for summation current formation on the L-conductor — a residual-current detection method that sums the phase currents to sense leakage. This is not a full ground-fault relay, but it provides basic earth-leakage awareness within the breaker itself. Communication function is present, so the breaker can report status and trip events to a higher-level system, though the protocol is not detailed in the basic spec set. Rated insulation voltage is 800 V, which covers 480/600 V class systems with margin. Storage temperature range is -40 °C to 80 °C, so the breaker can sit in an unheated warehouse or on a truck in winter without damage.