What this 3VA1220-5MH32-0CD0 is and what it does
The Siemens 3VA1220-5MH32-0CD0 is a SENTRON molded case circuit breaker (MCCB) configured as a starter protection device — meaning it's built to sit ahead of a motor starter and handle both overload and short-circuit fault clearing in a single footprint, rather than using separate fusing and a contactor. It's a 3-pole unit rated for a continuous current Iu of 200 A, and it carries a full thermal derating curve from 40 °C (200 A) up to 70 °C (176 A), so the panel designer sizes the load circuit against the actual cabinet ambient, not the nameplate maximum. Breaking capacity varies sharply with system voltage — 187 kA at 240 V, 121 kA at 415 V, 76 kA at 440 V, 30 kA at 500 V, and 4.5 kA at 690 V. That 4.5 kA at 690 V is the number to watch if this breaker feeds a 690 V drive bus; it still clears a fault, but the available fault current at that voltage must be verified against the installation's SCCR.
Dimensions and panel fit
The MCCB measures 105 mm wide, 158 mm tall, and 70 mm deep — a standard SENTRON 3VA frame size that fits the usual DIN-rail or screw-mount panel pattern. The 70 mm depth is shallow enough to clear most standard gland-plate clearances without a recessed sub-panel.
Auxiliary and release configuration
Factory-fitted with three auxiliary switches (HQ type) and an undervoltage release (UVR). The UVR trips the breaker when control voltage drops below the dropout threshold — standard for safety circuits where a loss of control power must open the motor circuit. No voltage trigger, no phase failure detection, no communication function, and no ground-fault monitoring are included on this variant.