MCCB for line protection — 40 A, 3-pole, with communication
The Siemens 3VA2040-5JQ36-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current at 40 °C, with a full-scale value of 40 A and an initial trip threshold of 16 A. The interrupting rating reaches 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 govern its fault-clearing capability at the point of common coupling.
Interrupting capacity and thermal performance
The interrupting rating curve is steep: 187 kA at 240 V drops to 121 kA at 415 V, holds at 121 kA through 440 V, then falls to 75.6 kA at 500 V and 3 kA at 690 V.
These dimensions define the cutout and clearance needed in a distribution panel or enclosure.
