What the ratings mean for fit
The Siemens 3VA1116-4EF32-0CC0 is a SENTRON molded case circuit breaker (MCCB) in the line-protection version, rated for a continuous current Iu of 160 A and carrying a TM240 thermal-magnetic overcurrent release. The 160 A rating holds flat from 40 °C through 50 °C — no derating needed in a typical 40 °C panel — then drops to 153.6 A at 55 °C, 150.4 A at 60 °C, 147.2 A at 65 °C, and 144 A at 70 °C. That thermal curve means a panel builder can size the breaker for a 160 A bus without headroom at 50 °C; above that, the load must be trimmed or the breaker upsized. Breaking capacity is specified at four voltage levels: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. The 75.6 kA at 415 V is the figure that governs most three-phase 400 V industrial installations — it safely interrupts a fault up to that level without cascading upstream, which is the key parameter for selective coordination studies.
Integration and panel fit
Three-pole construction, 76.2 mm wide (roughly 3 inches), 130 mm tall, 70 mm deep. The width matches the standard 3-module DIN-rail footprint for an MCCB this size, so it drops into a panel cutout designed for a 160 A frame without re-drilling. IP40 on the front — protected against tools and wires larger than 1 mm, but not against dust ingress into the enclosure interior. Comes with two auxiliary switches (HQ type) and an undervoltage release (UVR) fitted. The UVR trips the breaker when control voltage drops below the dropout threshold — standard for emergency-stop circuits where a loss of control power must open the main disconnect. The auxiliary switches provide status feedback to a PLC or annunciator panel.