What it is and what it does
The Siemens 3VA1116-3EF32-0AF0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in distribution panels. It carries a rated continuous current Iu of 160 A across three poles, with a TM240 thermal-magnetic release — meaning the thermal pickup is fixed at 160 A and the magnetic short-circuit trip is set at 240 A (the TM240 designation). The interrupting ratings climb to 75.6 kA at 240 V and 52.5 kA at 415 V, so it handles substantial fault currents without cascading upstream. The 800 V rated insulation voltage (Ui) confirms it's rated for 480/600 V class systems as well. This is a line-protection version — no undervoltage release, no ground-fault monitoring, no communication function, no phase-failure detection. It's a straightforward thermal-magnetic MCCB for feeder or main breaker duty where you don't need add-on electronics. The auxiliary contact version includes one auxiliary switch plus one trip alarm switch (HQ type), which is enough to signal the breaker state back to a PLC or annunciator panel.
Thermal derating and real-world current
The 160 A rating holds flat from 40 °C through 50 °C ambient. Above that it begins to taper: 153.6 A at 55 °C, 150.4 A at 60 °C, 147.2 A at 65 °C, and 144 A at 70 °C. If your panel internal ambient runs hot — say a sealed enclosure near a furnace line — the 70 °C derated figure of 144 A is the number to size against, not the nameplate 160 A. The operating temperature range spans -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Physical fit and panel integration
The 3VA1116-3EF32-0AF0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. The 76.2 mm width (three-pole) is the standard 3-module MCCB footprint for this frame size — it occupies three 25.4 mm pole centers. The front face carries an IP40 protection rating, adequate for a closed panel interior. The trip indicator is visible through the front cover, so a quick glance tells you whether the breaker tripped on overload or short circuit.