MCCB with ETU320 — selectivity and interrupting duty
The Siemens SENTRON 3VA2040-5HL32-0AA0 is a 3-pole molded case circuit breaker rated for 40 A continuous current across the full ambient range from 40 °C to 70 °C, with no derating needed up to that ceiling. Breaking capacity is 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V — figures that cover most industrial service-entrance and feeder applications.
Dimensions are 181 mm height, 105 mm width, and 86 mm depth.
Overcurrent release and protection characteristics
The ETU320 release is an electronic trip unit with an adjustable current range from 60 A to 480 A — note that the breaker's continuous rating is 40 A, so the release's minimum setting of 60 A means the breaker is applied at its rated 40 A continuous, and the release is set above that for short-circuit and ground-fault protection.