What this MCCB carries and where it fits
The Siemens 3VA2025-5KQ36-0AA0 is a SENTRON 3VA2 molded case circuit breaker rated for 25 A continuous current on a 3-pole line-protection duty. The interrupting capacity hits 187 kA at 240 V — that is the headline number for fault-clearing confidence in high-available-fault-current panels — and holds 121 kA at 415/440 V, tapering to 3 kA at 690 V. Insulation voltage is rated 800 V, so it handles 480/600 V class distribution without a derating concern on the dielectric side. The 86 mm depth and 105 mm width mean it fits standard 3VA2 panel cutouts; no rewiring if the panel was laid out for the same frame family.
Selectivity and coordination in a cold-chain panel
For a refrigeration or ammonia compressor panel, the 25 A rating and 187 kA SCCR at 240 V give you headroom to coordinate downstream with smaller branch breakers without cascading. The ground-fault monitoring uses summation current formation on the L-conductor — that catches a developing leak before it trips the whole feeder, which matters in a PSM-clean cold-storage environment where an unplanned outage thaws product. The communication function (listed as present) allows the breaker to report status to a PLC or BAS, so the maintenance team sees the trip cause remotely instead of walking a freezer aisle.
Thermal performance across the panel ambient range
The breaker holds its 25 A rating flat from 40 °C through 70 °C ambient — no derating needed in a warm enclosure near drives or transformers. Operating range is -25 °C to 70 °C, storage from -40 °C to 80 °C, so it can sit in an unheated warehouse or a freezer antechamber without issue. Maximum power loss is 0.84 W, negligible for panel thermal budgeting.