The 3VM1450-5EE42-0AA0 is a 4-pole IEC frame 630 circuit breaker rated 500 A continuous, with a 55 kA interrupting capacity at 415 V AC (breaking capacity class S). The TM220 thermal-magnetic trip unit provides adjustable overload protection (Ir = 350…500 A) and fixed instantaneous short-circuit protection at 10× In. The N conductor is unprotected — meaning the neutral pole is a solid link, not a switched or protected pole. This is standard for 3-phase, 4-wire systems where neutral overcurrent protection is not required by local code (e.g., solidly-grounded wye systems). The nut keeper kit simplifies panel assembly: the breaker ships with captive hardware that prevents nuts from dropping into live buswork during installation.
The 3VM1 frame is a fixed-mount, DIN-rail-compatible circuit breaker. The packaging dimensions (261 × 208 × 170 mm) give a rough envelope for panel layout — allow clearance for the nut keeper kit and cable entry. The 4-pole configuration occupies four module widths on the DIN rail; verify that the panel's gland plate and fill factor accommodate the 500 A cable terminations (typically 2× 185 mm² or 1× 300 mm² per phase, depending on derating).