Siemens 3VA1120-6EE42-0AA0 — 4-Pole MCCB with TM220 Release
The Siemens 3VA1120-6EE42-0AA0 is a SENTRON molded case circuit breaker (MCCB) configured as a 4-pole unit for line protection. It carries a 20 A continuous rating at 40 °C ambient, with the TM220 thermal-magnetic release providing both overload and short-circuit protection in a single device. The interrupting capacity is the headline figure here: 220 kA at 240 V AC, 154 kA at 415 V, and 121 kA at 440 V. That drops to 17 kA at 500 V and 690 V, so the part is sized for high-fault installations at the lower distribution voltages common in North American and some Asian panels. The rated insulation voltage is 800 V, and the maximum operating voltage is 690 V AC. The 20 A rating holds steady from 40 °C through 55 °C, then derates to 19 A at 60 °C and 65 °C, and stays at 19 A up to the 70 °C maximum operating temperature. That means in a warm enclosure — say a panel near a furnace line or in a non-conditioned electrical room — you still get the full 20 A up to 55 °C before any derating applies. Maximum power loss is 12 W, which matters for thermal budgeting inside a sealed enclosure. The front face carries IP40 protection — suitable for general indoor panel use where tools or fingers won't contact live parts, but not for washdown or dust-prone environments.
Mounting and Integration
The MCCB occupies 101.6 mm width, 130 mm height, and 70 mm depth — a 4-pole footprint that fits standard Siemens SENTRON panelboard and switchboard cutouts. No undervoltage release, no communication function, and no ground-fault monitoring on this variant; it is a straight thermal-magnetic breaker for basic line protection. Storage temperature range is -40 °C to 80 °C, so it can sit in an unheated warehouse or shipping container without issue. Operating range is -25 °C to 70 °C, covering most indoor industrial environments.