The Siemens SENTRON 3VA1112-6EF36-0DH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 125 A at 40 °C and a rated insulation voltage of 800 V. Its breaking capacity is 220 kA at 240 V, stepping down to 154 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V — the high interrupt rating at 240 V makes this a strong candidate for low-voltage distribution where fault current is severe.
Current derating and thermal management
The 125 A rating holds flat from 40 °C through 50 °C, then derates to 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. Maximum power loss is 30.6 W — factor that into enclosure heat rise if the breaker is panel-mounted alongside other heat sources.
Auxiliary and release configuration
This variant ships with an undervoltage release (UVR) and a complement of 2 auxiliary switches plus 1 trip alarm switch (HQ). The trip indicator is present. If your circuit requires undervoltage protection for motor starters or safety disconnects, the UVR is already built in — no separate add-on needed.
Dimensions and panel fit
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep. The 3-pole width is standard for SENTRON 3VA switchboard and distribution panel layouts — verify busbar spacing and mounting footprint against your existing panel cutout.