What this MCCB carries and where it fits
The Siemens 3VA1220-6EF42-0AB0 is a SENTRON molded case circuit breaker (MCCB) in a 4-pole configuration, designed for line protection in distribution panels and switchgear assemblies. Its TM240 thermal-magnetic release provides overload and short-circuit protection, with a rated current of 200 A at 40 °C that holds flat through 50 °C before derating to 176 A at 70 °C — useful when the breaker lands in a warm enclosure or next to other heat sources. Breaking capacity is the headline number here: 220 kA at 240 V AC, 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. That 220 kA figure at 240 V means this breaker can interrupt a massive fault without external current-limiting fuses — it's sized for high-available-fault-current panels, typically close to a transformer or in a main distribution board. Rated insulation voltage is 800 V, and max power loss sits at 42 W. The breaker ships with two auxiliary switches (HP type) integrated, so you get status feedback without adding external blocks. No undervoltage release, no ground-fault monitoring, no communication function — this is a straight line-protection MCCB, not a multifunction trip unit.
Thermal derating and panel integration
The 200 A rating holds from 40 °C to 50 °C, then drops to 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. If your panel ambient runs above 50 °C, size the upstream conductor and downstream load for the derated current, not the nameplate 200 A. The 42 W power loss at full load is moderate for a 200 A frame — ventilation or spacing from other breakers is still prudent. Mounting footprint: 158 mm tall, 140 mm wide, 70 mm deep. That 70 mm depth is shallow enough for most 600 mm deep enclosures, leaving room for rear-mounted busbars or cable ducts. The 4-pole width (140 mm) matches the standard SENTRON 3VA frame spacing — it will bolt directly onto a 4-pole busbar system without adapters. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage minimum matters if this breaker sits in an unheated warehouse before installation — it can handle the cold, but let it warm above -25 °C before closing the contacts under load.
Lifecycle and sourcing posture
For BOM planning, the 3VA1220-6EF42-0AB0 is a standard catalog item in the SENTRON 3VA line. It is sourced and quoted to order against an RFQ through independent distribution; current pricing and availability are confirmed at quote time. No second-source cross-reference is required at this stage, but if you are evaluating alternatives, the 5SQ2670-2YA63 series occupies a similar 200 A 4-pole MCCB class — verify the mounting hole pattern and terminal layout before substituting.