What this 3VA2140-7HL32-0AA0 is and what it protects
The Siemens SENTRON 3VA2140-7HL32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, designed specifically for line protection — meaning it sits at the feeder or branch to protect cables and busbars from overloads and short circuits, not motor or generator protection. Its electronic trip unit, the ETU320, gives you adjustable overload and short-circuit settings, so you can coordinate it downstream of a larger main breaker and upstream of distribution panels without nuisance tripping. The interrupting capacity is the headline number here: 330 kA at 240 V AC, 242 kA at 415 V and 440 V, 187 kA at 500 V, and still 3.7 kA at 690 V. That 330 kA at 240 V means it can safely clear a massive fault on a high-capacity transformer secondary — common in industrial step-downs — without the breaker failing or the arc flashing over to adjacent gear.
Panel fit and mounting
Dimensions are 181 mm high, 105 mm wide, 86 mm deep. That 105 mm width is a standard 3-pole MCCB footprint for a SENTRON 3VA frame — it drops into a panel that was laid out for a 3VA1110 or similar without bracket changes. Front face carries IP40 protection — fine for a dry indoor panel, but not for washdown zones or outdoor enclosures without a higher-rated cover. Rated insulation voltage is 800 V, so it's comfortable on 480 V and 600 V class systems with margin to spare.
Thermal performance and power loss
The breaker holds its full 40 A rating across the entire operating temperature range from -25 °C to 70 °C — no derating needed up to the max. That is unusual; many MCCBs start derating above 40 °C. This one doesn't, which simplifies panel design in hot environments. Maximum power dissipation is 1.6 W per pole at rated current. That is low enough that you won't need to add extra ventilation for a single breaker, but cluster several in a small enclosure and you should still sum the heat load.