40 A, 4-pole SENTRON MCCB — line protection with communication
The Siemens SENTRON 3VA2040-8KQ42-0AA0 is a 4-pole molded case circuit breaker rated for 40 A continuous current, designed specifically for line protection in distribution panels. It carries a 440 kA interrupting capacity at 240 V, stepping down to 330 kA at 415/440 V and 220 kA at 500 V, with 52.5 kA at 690 V — giving you selectivity headroom across common low-voltage distribution voltages. The breaker includes an onboard communication function and summation ground-fault monitoring (L+N conductor), so it fits into monitored distribution schemes without an external module.
SCCR and thermal performance across the panel temperature band
Rated continuous current holds flat at 40 A from 40 °C through 70 °C ambient — no derating needed within that window, which simplifies panel thermal budgeting. The 4-pole footprint measures 140 mm wide by 181 mm tall by 86 mm deep, fitting standard Siemens SENTRON mounting patterns. Insulation voltage is rated 800 V, so the breaker is comfortable in 480/277 V and 600 V nominal systems with margin.