Siemens 3VA2140-8JQ42-0AA0 — SENTRON MCCB, 40 A, 4-Pole, ETU560
The Siemens 3VA2140-8JQ42-0AA0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) rated for line protection at 40 A continuous, with four poles and an ETU560 electronic trip unit. The 40 A rating holds flat across the full operating temperature range from -25 °C to 70 °C — no derating needed up to that ambient, which simplifies panel design in warm enclosures. Breaking capacity is the standout spec here: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and still 52.5 kA at 690 V. That puts it into high-fault-current switchgear — think utility tie points, large transformer secondaries, or industrial mains where available fault current exceeds 100 kA. The ETU560 trip unit supports ground-fault monitoring via summation current formation on L+N, and the breaker includes a communication function for integration into a monitored distribution system.
Panel fit and integration
Dimensions are 181 mm height, 140 mm width, 86 mm depth — a standard 4-pole MCCB footprint for DIN-rail or panel-mount installation. Front-face protection is IP40, adequate for enclosed switchboards but not for washdown environments. The 1.2 W maximum power loss is low enough that ventilation requirements are minimal in a typical distribution panel.