What this MCCB carries and where it fits
The Siemens SENTRON 3VA2040-7JQ46-0AA0 is a 4-pole molded case circuit breaker rated at 40 A continuous current, with an ETU560 electronic trip unit. The interrupting ratings are the headline here: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3 kA at 690 V. That 330 kA at 240 V means it can safely clear a fault up to that level without cascading upstream — critical for high-fault-capacity main or feeder breakers in industrial switchboards. The 40 A rating holds flat across the full operating temperature range from 40 °C to 70 °C, so no derating headache in a warm enclosure. The ETU560 release provides adjustable long-time and short-time pickup and delay settings, plus ground-fault protection via summation current formation on L+N. The N-conductor protection is adjustable OFF or from 40 % to 160 %. Communication function is built in, so it can talk to a higher-level monitoring system without an add-on module. Dimensions are 181 mm high, 140 mm wide, 86 mm deep — a standard 4-pole MCCB footprint for panel mounting. Front protection is IP40, meaning it's sealed against tools and small wires but not against water ingress, so keep it inside the enclosure.
How it compares to the 3VA2025-8JQ42-0AA0
The closest functional sibling is the 3VA2025-8JQ42-0AA0, a 25 A 4-pole MCCB with the same ETU560 release and similar interrupting ratings. The deciding factor is the continuous current: 40 A vs 25 A. If your load is sized for 25 A, the 3VA2025 saves a few dollars and panel space is identical. If you need the full 40 A headroom, this is the one. No rewiring difference — same footprint, same lug pattern.
Panel integration notes
Mounts on a standard DIN rail or direct panel surface via the four mounting points. The 86 mm depth leaves room for rear-access wiring in a 200 mm deep enclosure. Latching endurance is rated at 20,000 operations — that's the mechanical life, not the electrical switching life under load, so it's fine for infrequent manual switching but not a daily disconnect duty cycle.