What this MCCB is and where it lands
The Siemens 3VA2140-8JP36-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in 3-pole, 40 A continuous duty, with an ETU550 electronic trip unit. It fits into distribution panels and switchboards where selectivity and coordination with downstream breakers matter — the ETU550 gives you adjustable long-time, short-time, instantaneous, and ground-fault (optional) curves, so you can tune it to the load without changing hardware. Rated continuous current holds flat at 40 A from 40 °C through 70 °C ambient — no derating needed across the typical panel temperature range. Insulation voltage is 800 V, and the interrupting capacity reaches 440 kA at 240 V, 330 kA at 415 V, and 220 kA at 500 V, so it handles high-fault utility feeds without cascading upstream. The breaker includes a communication function — the ETU550 release can interface with SENTRON powerconfig software for remote monitoring and parameterization, which is useful for condition-based maintenance or when the breaker sits in a remote MCC.
Dimensions and panel fit
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep. That 105 mm width is the standard 3-pole MCCB footprint for the SENTRON 3VA2 frame.
What the ratings mean for coordination
The interrupting capacity at 690 V is 52.5 kA. At 440 V, the rating is 330 kA. The ETU550 release supports LSIG protection; the ground-fault monitoring version is not included on this variant.