The Siemens 3VA1220-6MH32-0BA0 is a SENTRON molded case circuit breaker (MCCB) rated 200 A continuous at 40 °C, with a TM120M thermal-magnetic overcurrent release and an integrated undervoltage release (UVR). Its interrupting capacity reaches 220 kA at 240 V, 154 kA at 415 V, and 75.6 kA at 440 V — figures that place it in the high-fault category for industrial distribution and motor control centers where fault currents exceed standard MCCB ratings. 3-pole design, 800 V rated insulation voltage.
Thermal derating and panel integration
At 40 °C the breaker carries the full 200 A; derate to 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C — a straight thermal curve that lets the panel designer size the enclosure ventilation against the load current without guessing. The 70 mm depth and 105 mm width fit standard SENTRON mounting footprints; the 158 mm height clears typical DIN-rail enclosure gutters. Maximum power loss of 44.5 W at rated load informs the enclosure thermal budget — enough to require a vented gland plate if multiple breakers are ganged in a sealed cabinet.
Undervoltage release and trip unit detail
Factory-fitted undervoltage release (UVR) trips when control voltage drops below threshold. The TM120M thermal-magnetic trip provides fixed thermal protection for overloads and magnetic instantaneous protection for short circuits; no communication function or ground-fault monitoring is built in. Operating temperature range of -25 °C to 70 °C and storage range of -40 °C to 80 °C cover unheated warehouses and panel interiors near process heat.