The Siemens 3VA2040-6HL46-0AA0 is a SENTRON molded case circuit breaker (MCCB) with an ETU320 electronic trip unit, rated for a continuous current of 40 A across the full ambient range from 40 °C to 70 °C — no derating required within that span. That 40 A rating is the load-side limit; the breaker frame itself is rated for a maximum of 480 A and a minimum setting of 60 A, so the ETU320 is set at the low end of the frame's capability. The 242 kA interrupting capacity at 240 V and 187 kA at 415 V means this breaker safely clears high-fault currents without cascading upstream — a key figure for selectivity studies in distribution panels where the available fault current is known to exceed 100 kA.
Integration and panel fit
The breaker occupies 140 mm width, 181 mm height, and 86 mm depth. The ETU320 trip unit is an electronic overcurrent release with no communication function and no ground-fault monitoring; it provides adjustable long-time, short-time, and instantaneous protection settings via DIP switches or rotary dials on the front face. No undervoltage release and no voltage trigger are fitted, so any undervoltage or shunt-trip function must be added externally if required.