What this MCCB is and what it does
The Siemens 3VA1150-6EE46-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. Its 4-pole construction with a TM220 thermal-magnetic release handles overload and short-circuit protection on three-phase systems with a switched neutral. The 50 A rating at 40 °C holds up to the full frame size without derating; above 55 °C the rating steps down to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C, so panel ambient temperature directly governs the usable current. Breaking capacity is the headline selection criterion here. This breaker interrupts 220 kA at 240 V AC, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500 V or 690 V. Those figures place it in the high-interrupting category for industrial mains feeding transformer secondaries or large motor control centers where fault currents exceed 100 kA. The 800 V rated insulation voltage confirms it is built for 690 V line-to-line systems common in heavy industry.
Panel fit and integration
Dimensions are 130 mm height, 101.6 mm width, and 70 mm depth. The 4-pole width at roughly 100 mm fits standard 4-module MCCB mounting footprints in distribution boards. Front IP40 protection means the enclosure keeps out tools and wires larger than 1 mm but is not sealed against moisture — suitable for indoor panel mounting, not washdown areas. Maximum power loss of 14.6 W under full load should be factored into enclosure thermal calculations, particularly in high-density panels. No undervoltage release, no trip indicator, no voltage trigger, and no communication function are fitted on this variant. The TM220 release is purely thermal-magnetic — no electronic trip unit. Ground-fault monitoring is absent. For applications requiring shunt trip, UVR, or communication, a different 3VA variant with those options is needed.