SENTRON 3VA2025-5HM46-0AA0 — 25 A 4-Pole MCCB with Ground-Fault Monitoring
Its 187 kA breaking capacity at 240 V AC handles high-fault scenarios typical of transformer-fed switchboards, while the 121 kA rating at 415/440 V covers common European and North American line voltages. The 3 kA at 690 V means it's not intended for 690 V motor circuits — that's a fault-current floor, not a normal operating point. This breaker integrates summation-current ground-fault monitoring on the L+N conductors, so it detects leakage without a separate GFCI module — a space-saver in panels where ground-fault protection is required by code or process safety. The 0.84 W maximum power loss keeps heat rise minimal in a crowded enclosure. The 4-pole design covers three-phase plus neutral, common for main incomers or feeder breakers in 400/230 V distribution.
That's unusual for an MCCB; most thermal-magnetic breakers start dropping below 40 °C. The 800 V rated insulation voltage means it's safe on 480/277 V and 600/347 V systems with margin. The adjustable thermal trip range (15 A minimum to 25 A full-scale) lets you fine-tune the overload protection for the actual load without changing the breaker — useful when a panel feeds multiple motor starters and the exact load current isn't known until commissioning. If you need remote trip or status feedback, you'll add an external shunt trip or auxiliary contact block.