What it is and what it does
The Siemens SENTRON 3VA2140-8HM32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, designed for line protection in distribution panels. It carries an 800 V rated insulation voltage and delivers a 440 kA interrupting capacity at 240 V, tapering to 52.5 kA at 690 V — meaning it can safely clear high-fault currents on the line side without upstream coordination issues.
Ratings and what they mean for fit
The 40 A continuous rating holds across ambient temperatures from 40 °C to 70 °C — no derating curve to chase in a warm panel. That's useful when the breaker sits next to heat-generating contactors or drives. Dimensions are 86 mm deep, 105 mm wide, 181 mm tall — a standard SENTRON 3VA form factor that fits existing DIN-rail or panel-mount footprints in most industrial enclosures. The 3-pole block occupies three module widths on a DIN rail. The breaker includes summation-current ground-fault monitoring on the line conductor — a built-in detection feature that can reduce external GFCI hardware in grounded-wye systems. No undervoltage release or communication module is fitted on this variant.