The Siemens SENTRON 3VA2025-6JQ36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 25 A continuous current, with an adjustable thermal-magnetic trip unit covering 38 A minimum to 300 A maximum. That trip range means one breaker body covers a wide spread of branch-circuit loads — from a small motor feeder up to a 300 A bus tap — without swapping the trip pack. Breaking capacity is the headline here: 242 kA at 240 V, dropping to 187 kA at 415 V and 440 V, then 121 kA at 500 V, and 3 kA at 690 V. At 240 V that's a very high interrupt rating — it'll clear a fault on a large transformer secondary or a utility-service entrance without the arc chute struggling. At 690 V the 3 kA figure is modest; this is not the breaker for a 690 V motor center with high available fault current. Derating is flat across the board: 25 A at 40 °C, 45 °C, 50 °C, 55 °C, 60 °C, 65 °C, and 70 °C. No thermal knock-down as the panel warms up — useful in a sealed enclosure or a hot machine bay where other breakers would start to trip early.
Dimensions and panel fit
Footprint is 105 mm wide by 181 mm tall by 86 mm deep.
Lifecycle and sourcing
The breaker includes a communication function and a ground-fault monitoring version configured for summation current formation on the L-conductor.
Key ratings at a glance
Rated insulation voltage is 800 V, so the breaker is rated for 690 V systems with margin. Power loss at rated current is 0.84 W — negligible for panel heat budgeting. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The trip indicator is not present on this variant, and there is no undervoltage release or voltage-trip module fitted. If you need shunt-trip or UVR capability, you'd add the accessory later — the 3VA platform supports field-installable trip modules.