What this MCCB delivers
The Siemens 3VA2225-6HL32-0AF0 is a SENTRON molded case circuit breaker rated for 250 A continuous current at 40 °C, with a three-pole configuration and a trip indicator for quick fault identification. It's designed for line protection — the primary job is to protect cables and busbars from overloads and short circuits in a distribution panel. Breaking capacity is the headline here: 242 kA at 240 V AC, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4.5 kA at 690 V. That 242 kA at 240 V means it can safely interrupt a fault current up to that level without the arc escaping or the case rupturing — critical for high-fault installations like large transformer secondaries or industrial switchboards. The thermal derating curve is laid out: at 55 °C it's still good for 241 A, at 70 °C it's 213 A. That's a 15% drop from the 40 °C rating — plan your enclosure ventilation if the ambient is near the top end.
Mounting and integration
At 105 mm wide, 181 mm tall, and 86 mm deep, this breaker fits into a standard MCCB footprint on a DIN rail or panel-mount base. The 86 mm depth is the dimension that matters when you're clearing the gland plate or door — it's shallow enough for most 600 mm deep enclosures. Comes with one auxiliary switch and one trip alarm switch (HQ type) as standard — no undervoltage release, no communication module, no ground-fault monitoring on this variant. If you need those, you're looking at a different suffix.
Lifecycle and sourcing
The basic switch version is 3VA2225-6HL32-0AA0, which is the same breaker without the auxiliary switch block. If you're replacing a panel that used the -0AA0, this -0AF0 drops in with the same footprint and adds the alarm contact.