The Siemens SENTRON 3VA2125-6HM46-0AA0 is a 4-pole molded-case circuit breaker (MCCB) rated for 25 A continuous current, designed for line protection in distribution panels. It carries a maximum breaking capacity of 242 kA at 240 V, tapering to 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V — the 690 V figure is the weak leg, so verify your fault level if feeding a 690 V bus. The 86 mm depth and 140 mm width fit standard DIN-rail or panel-mount enclosures; plan for the 181 mm height when selecting gland plates or door clearance.
Ground-fault and thermal performance
This MCCB includes summation-current ground-fault monitoring on the L+N conductors — it senses imbalance between line and neutral, not a separate ground-fault sensor. That makes it suitable for solidly-grounded TN systems where you want earth-leakage detection without a dedicated GFCI module. The thermal trip holds steady at 25 A across the entire -25 °C to 70 °C operating range; no derating needed up to 70 °C ambient, which simplifies panel cooling calculations. Rated insulation voltage is 800 V, so it can sit on a 690 V line with headroom.