The Siemens 3VA1063-4ED42-0AD0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C ambient, with a 4-pole configuration and a TM210 thermal-magnetic overcurrent release. Its breaking capacity reaches 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that govern its fault-interruption capability in low-voltage distribution panels.
Ratings and what they mean for fit
The 63 A rating holds flat from 40 °C through 50 °C; derating begins at 55 °C (60.48 A) and drops to 56.7 A at 70 °C. For a panel running warm — say a packed enclosure near the upper operating limit of 70 °C — the effective ampacity is about 10% below the nameplate, so the load circuit needs to stay under that derated figure. The 121 kA at 240 V is the highest short-circuit current this MCCB can safely interrupt without upstream coordination failure. At 415 V the rating drops to 75.6 kA, and at 690 V to 11.9 kA — the voltage-dependent curve is typical for an air-break design, and the 690 V figure is the one to check if the breaker lands on a 690 V line side. Rated insulation voltage is 800 V, which covers 480/277 V and 600 V delta systems with margin. The TM210 release is a fixed thermal-magnetic type — no interchangeable trip unit, so the 63 A setting is permanent. Three auxiliary switches (HQ type) are built in for status feedback to a PLC or annunciator panel.
Deployment context
This MCCB is sized for DIN-rail or panel-mount installation in a low-voltage switchboard or distribution board. The 101.6 mm width (4-pole) and 70 mm depth fit standard SENTRON 3VA cutouts; verify the back-panel clearance for the 130 mm height plus arc-chamber venting. IP40 on the front means it is protected against tools and solid objects larger than 1 mm — fine for a closed cabinet, but not for washdown areas.