What this MCCB is and what it protects
The Siemens SENTRON 3VA1116-6EE32-0AA0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection — meaning it sits at the incoming feeder or main distribution point, not on a specific load branch. Its job is to isolate the panel and clear faults before they cascade downstream. Rated at 160 A continuous, it holds that current from 40 °C through 50 °C ambient without derating. At 55 °C it carries 158 A, at 60 °C it carries 155 A, at 65 °C it carries 153 A, and at 70 °C it carries 150 A — so in a warm enclosure you lose about 2 A per 5 °C rise above 50 °C. That thermal curve is what you use to size the breaker for actual panel conditions, not the nameplate. Interrupting capacity is the headline number for a main breaker: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V. Those figures tell you the maximum fault current the breaker can safely clear at each voltage level — critical for coordination studies and SCCR compliance on the panel nameplate.
Overcurrent release and trip characteristics
The overcurrent release is designated TM220 — a thermal-magnetic type. The thermal element handles overloads (slow, I²t curve), the magnetic element handles short-circuits (instantaneous). TM220 is a standard fixed-trip release; there is no electronic adjustment or communication module on this variant. No undervoltage release, no voltage trip, no ground-fault monitoring, and no communication function are fitted. This is a plain-vanilla thermal-magnetic MCCB for straightforward line protection where remote monitoring or shunt-trip functions are not required.
Physical fit and panel integration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth. That 3-inch width (76.2 mm) is standard for a 3-pole SENTRON 3VA frame — it occupies three 25 mm module spaces on a DIN rail or mounting plate. Depth of 70 mm (2.76 in) leaves clearance for rear busbar connections in a typical distribution panel. Front face carries IP40 protection — suitable for general indoor panel installation where no water jets or dust ingress are expected. The enclosure itself is not sealed for washdown. Rated insulation voltage is 800 V, so the breaker is suitable for 690 V systems with adequate clearance. Maximum power loss at rated current is 38 W — factor that into enclosure ventilation if the panel is densely packed.