What this 3VA1 breaker carries
The Siemens 3VA1450-6EF32-0DB0 is a 3-pole IEC frame 630 molded case circuit breaker with a 70 kA interrupting capacity at 415 V (class H). It is rated at 500 A continuous (In) with a TM240 thermal-magnetic trip unit providing adjustable overload protection from 350 A to 500 A (Ir) and short-circuit pickup adjustable from 5 to 10 times In. The unit ships with an integrated undervoltage release rated 208–230 V AC 50/60 Hz and two auxiliary switch changeover contacts.
What the ratings mean for panel integration
The 70 kA Icu at 415 V means this breaker can safely interrupt fault currents up to that level without upstream fuses or a current-limiting reactor — critical for high-fault installations like transformer secondaries or large motor control centers. The TM240 trip unit gives you a 350–500 A overload band, so you can dial in the exact motor FLA or feeder load without swapping thermal elements. The undervoltage release (208–230 V AC) drops the breaker on loss of control voltage, which is standard for emergency-stop circuits or undervoltage protection schemes. The two auxiliary switches provide status feedback to a PLC or annunciator panel.