What this MCCB is and what it does
The Siemens 3VA2220-7MN32-0AD0 is a SENTRON molded case circuit breaker (MCCB) in the motor protection version, meaning it is designed to protect motor circuits against overloads and short circuits, not just general distribution wiring. It carries a rated continuous current (Iu) of 200 A across three poles, with an ETU350M electronic overcurrent release that gives you adjustable trip settings for coordinating with motor starting curves. Breaking capacity is the headline number here: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V. That is very high interrupting capacity — it can safely clear a fault well beyond what most distribution panels will ever see, which matters for high-fault locations like large motor control centers or transformer secondaries where available fault current is high. The breaker includes phase failure detection and ships with three high-quality auxiliary switches pre-installed for status feedback to a PLC or indication panel. No undervoltage release or ground fault monitoring is fitted from the factory — those would need to be added externally if required.
Thermal derating and operating limits
The 200 A rating holds at ambient temperatures up to 50 °C without derating. Above that, the continuous current must be reduced: 192 A at 55 °C, 188 A at 60 °C, 184 A at 65 °C, and 180 A at 70 °C. If this breaker is going into a hot panel — near a drive, transformer, or in a poorly ventilated enclosure — factor that derating into your load calculation. The maximum operating temperature is 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 75 W, which contributes to the enclosure's thermal budget. The rated insulation voltage (Ui) is 800 V, so it is suitable for 690 V systems with margin.
Physical fit and panel integration
Dimensions: 181 mm high, 105 mm wide, 86 mm deep. The 105 mm width is standard for the SENTRON 3VA2 frame size. The auxiliary contact version (3VA9608-0BB24) is integrated as a supplied basic switch. No communication function or voltage trigger is built in — this is a standalone protection device, not a smart breaker with integrated metering or bus communication.