SENTRON 3VA1150-5EE46-0AA0 — 4-pole MCCB, 50 A, 187 kA SCCR
The Siemens SENTRON 3VA1150-5EE46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, with a TM220 thermal-magnetic release. It carries 50 A continuously at 40 °C ambient, derating to 45 A at 70 °C — the thermal curve governs the real-world ampacity in a warm panel. The interrupting rating hits 187 kA at 240 V AC, dropping to 121 kA at 415 V and 75.6 kA at 440 V; at 500 V and 690 V it holds 17 kA. That SCCR headroom makes it a strong candidate for high-fault industrial distribution where selectivity with upstream breakers matters.
Sizing and thermal derating
Rated current holds flat at 50 A from 40 °C through 50 °C, then drops to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. In a sealed panel with limited airflow, plan for the 70 °C derated value unless you can keep the ambient below 50 °C. The insulation voltage is rated at 800 V, and the front IP40 protection class suits dry indoor panels — not washdown environments.
Panel fit and mounting
The breaker measures 101.6 mm wide, 130 mm tall, and 70 mm deep — a 4-pole footprint that fits standard SENTRON panel cutouts. No trip indicator, no undervoltage release, and no communication function on this variant; it is a straight thermal-magnetic line-protection device. Spring-cage terminals accept typical panel wiring; the depth of 70 mm (2.76 in) leaves room for rear busbar connections in a standard distribution cabinet.