63 A continuous, 242 kA interrupting — the selectivity anchor
The Siemens 3VA2063-6HL32-0DA0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. Its interrupting capacity hits 242 kA at 240 V AC, 187 kA at 415 V AC, and still holds 121 kA at 500 V AC, making it a strong candidate for the main or feeder position in a high-fault panel where selectivity with downstream breakers is critical. This is a line-protection device (not motor-protective), designed for cable and busbar protection in distribution boards. The 3-pole frame carries an undervoltage release (UVR) as standard — the UVR trips the breaker when supply voltage drops below a set threshold, which is useful for preventing automatic restart after a brownout or for coordinating with emergency-stop circuits.
Dimensions and panel fit
The breaker measures 181 mm high, 105 mm wide, and 86 mm deep. That 86 mm depth is the dimension that matters most when fitting into a shallow enclosure or a retrofit panel where back-panel clearance is tight. The 105 mm width is standard for a 3-pole MCCB in this class — it will occupy the same DIN-rail or mounting-plate footprint as other SENTRON 3VA2 frames of similar rating.
What the ratings mean for coordination
The 242 kA breaking capacity at 240 V is the headline number, but the 187 kA at 415 V is the one that governs most industrial panel applications in North America and Europe. That figure tells you the breaker can safely interrupt a fault up to 187 kA without welding contacts or venting arc gas — essential for maintaining arc-flash boundaries and for achieving Type 2 coordination with downstream contactors and starters. The 63 A continuous rating is flat from 40 °C to 70 °C, which means no thermal derating in a warm enclosure — a practical advantage over breakers that lose ampacity above 40 °C.
Undervoltage release and auxiliary options
The integrated undervoltage release (UVR) trips the breaker when control voltage drops — typically set to operate at 35% to 70% of rated voltage. This is a factory-installed option on this order code, not a field-addable kit. There is no communication function, no ground-fault monitoring, and no voltage-trip feature on this variant. The basic switch assembly is 3VA20636HL320AA0, which is the sealed sub-assembly that carries the contacts and arc chambers.