What this MCCB delivers
The Siemens 3VA1220-5EF32-0LC0 is a SENTRON 4-pole molded case circuit breaker rated for 80 A continuous current (Iu) with a TM240 thermal-magnetic release, configured for line protection. Its interrupting capacity peaks at 220 kA at 240 V, dropping to 154 kA at 415 V, 121 kA at 440 V, and 17 kA at both 500 V and 690 V — the sharp roll-off above 440 V means this breaker is sized for low-voltage distribution where high fault currents are expected, typical in main switchboards or large sub-distribution panels. The 80 A rating holds flat from 40 °C through 50 °C, then derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C — a gentle slope that keeps the breaker usable in warm enclosures without oversizing the frame.
Panel fit and integration
At 130 mm tall and 4 in wide, this 4-pole MCCB fits standard US-pattern distribution panels and switchboard mounting — the 4 in width matches typical MCCB cutouts for high-density layouts. Front protection is IP40, so it's fine for clean indoor panels but not washdown or outdoor exposure without an enclosure. The breaker ships with 2 auxiliary switches (HQ type) pre-installed for status feedback to a PLC or indication lamp — no separate aux block to order. An undervoltage release is included, and a motor drive can be added as an optional extension for remote tripping or reset.
Lifecycle and compliance posture
Rated insulation voltage is 800 V, and maximum DC operating voltage is 600 V — the DC rating is worth noting for battery-bank or UPS applications, though the manual should be consulted for DC derating specifics. The N-conductor is protected at 100% rating, meaning the neutral pole is fully rated for the same current as the phases — important for 4-wire systems with harmonic loads.