SENTRON 3VA1040-4ED32-0JH0 — 40 A MCCB with 121 kA interrupting capacity
The Siemens 3VA1040-4ED32-0JH0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in distribution panels. Three poles, rated 40 A continuous at 40 °C ambient, with no derating needed up to 50 °C — still holds 40 A at 50 °C. That 40 A rating holds steady through 50 °C; above that it tapers to 36 A at 70 °C, which matters if the breaker sits in a hot enclosure near other heat sources. Interrupting capacity is the headline number here: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 121 kA at 240 V gives serious fault-current headroom for industrial distribution — typical panel SCCR requirements in the 65–100 kA range are comfortably covered. At 415 V the 75.6 kA rating still handles most high-fault service-entrance applications. The 11.9 kA at 690 V is adequate for 690 V motor control centers where fault currents are usually lower.
What the ratings mean for panel fit
Dimensions: 130 mm tall, 76.2 mm wide, 70 mm deep — standard 3-pole MCCB footprint. Rated insulation voltage is 800 V, which means the breaker is designed for systems up to 690 V phase-to-phase with adequate creepage and clearance. Power loss at rated current is 10.8 W maximum — negligible for thermal budgeting in a ventilated panel, but worth noting if multiple breakers cluster in a sealed enclosure. The 3VA1040-4ED32-0JH0 ships with a shunt trip (STL) auxiliary release and a 2 auxiliary switch + 1 trip alarm switch HQ configuration. That means it can be remotely tripped via the shunt trip coil, and the auxiliary contacts report breaker position and trip status back to a PLC or annunciator panel. No undervoltage release on this variant — if you need UVR protection, this isn't the order code.