What the breaking ratings mean for your panel
The Siemens SENTRON 3VA1120-6EE46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 20 A and a TM220 thermal-magnetic overcurrent release. The breaking capacity at 240 V is 220 kA, at 415 V it is 154 kA, at 440 V it is 121 kA, and at 500 V and 690 V it drops to 17 kA — so the fault-clearing capability is highest on lower-voltage distribution, and the 17 kA figure at 500/690 V still covers most industrial motor branch circuits. The insulation voltage Ui is rated 800 V, and the maximum operational DC voltage is 600 V. This MCCB is designed for panel-mount integration; the front face carries IP40 protection, suitable for enclosed switchgear.
Thermal derating and power loss
The 20 A rating holds from 40 °C up to 55 °C; at 60 °C and 65 °C it derates to 19 A, and it holds at 19 A through 70 °C. Maximum power loss is 12 W. The latching endurance is 20,000 operations, which is typical for a fixed-thermal MCCB in distribution duty.
Physical fit and panel integration
Dimensions: 130 mm height, 101.6 mm width, 70 mm depth. The 4-pole footprint matches standard Siemens SENTRON 3VA panel cutouts. The front IP40 rating means it is suited for enclosed distribution boards — not for washdown or outdoor exposure without an additional enclosure.