Breaking capacity and what it means for your panel
The 3VA1120-3EF36-0BA0: The interrupting rating varies with system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 75.6 kA figure at 240 V is the headline number — it means this breaker can safely clear a fault up to that level without welding contacts or rupturing the case, which is critical for high-fault-capacity panels like those feeding motor control centers or large distribution boards. The 11.9 kA rating at 690 V still covers most industrial 690 VAC systems.
Thermal-magnetic curve and continuous current
The TM240 release provides a fixed thermal trip for overloads and a magnetic instantaneous trip for short circuits. Continuous current holds at 20 A from 40 °C through 55 °C, then derates to 19 A at 60 °C and 65 °C, and 19 A at 70 °C. The insulation voltage is rated 800 V, so the breaker is suitable for 690 VAC systems with margin. Power loss at rated current is 14.5 W maximum — relevant for panel thermal calculations in enclosed assemblies.
Physical fit and panel integration
Dimensions are 70 mm deep, 76.2 mm wide, and 130 mm high. The 76.2 mm width (3 inches) is the standard 3-pole MCCB footprint for this SENTRON frame size — it occupies three 25.4 mm module positions on a DIN rail or panel-mount base. The 70 mm depth is shallow enough for most 200 mm deep enclosures. No communication function or ground-fault monitoring is built in; this is a straight thermal-magnetic breaker with undervoltage release.