What this MCCB is and what it does
The Siemens SENTRON 3VA2010-5JQ32-0CH0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current at ambient temperatures up to 70 °C, with no derating needed across that range. It is designed for line protection — the primary overcurrent and short-circuit protection device in a distribution panel, switchboard, or motor control center feeder. Its interrupting capacity reaches 187 kA at 240 V AC, 121 kA at 415/440 V, 75.6 kA at 500 V, and 3 kA at 690 V — figures that give the panel designer substantial fault-current headroom for high-capacity transformer-fed installations or industrial plant power centers. The breaker ships with an undervoltage release (UVR) as the auxiliary release, plus two auxiliary switches and one trip-alarm switch (HQ configuration). Communication capability is built in, making it suitable for integration with a higher-level energy management or remote monitoring system.
Ratings and what they mean for fit
The 100 A continuous rating holds flat from 40 °C through 70 °C ambient — no thermal derating curve to calculate for typical industrial panel environments. The adjustable thermal-magnetic trip unit is set at 100 A full-scale, with a minimum setting of 20 A, giving the commissioning engineer flexibility to match the exact load without swapping the breaker frame. The frame rating range (minimum 150 A, maximum 1 200 A) indicates this is a 3VA2-size frame — the physical housing that determines bus-bar spacing and mounting footprint. The 100 A trip unit is the smallest plug-in rating for this frame, so if the load grows later, the trip unit can be swapped up without pulling the breaker out of the panel. Maximum power loss is 16 W at rated current — relevant for thermal management in a densely packed panel, particularly when multiple breakers are side-by-side in a switchboard section.
Physical integration and mounting
Dimensions are 181 mm high, 105 mm wide, and 86 mm deep — a standard 3VA2 frame footprint that fits Siemens SENTRON panelboards and switchboard mounting plates without adapters. The 105 mm width (4.13 in) matches the three-pole module spacing in most LV switchgear cubicles. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage minimum covers cold warehouse conditions; the operating minimum suits unheated electrical rooms in temperate climates.