Siemens 3VM1463-4EE32-0AA0 — 630 A SENTRON MCCB, TM220 Release
The Siemens 3VM1463-4EE32-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 630 A at 40 °C through all three poles. It uses a TM220 thermal-magnetic overcurrent release — the fixed thermal element handles overloads, the magnetic element clears short-circuits, and the 220 designation indicates the magnetic pickup is fixed at 10× In (6,300 A). The interrupting capacity reaches 121 kA at 240 V AC and 76 kA at 415/440 V AC, which gives solid headroom for most industrial distribution panels without cascading upstream. Rated insulation voltage is 800 V, operating voltage 690 V AC. The front face carries IP40 protection — suitable for enclosed panel mounting where tools are needed to access live parts. Dimensions are 248 mm high, 138 mm wide, 110 mm deep, fitting standard SENTRON mounting patterns.
Current Derating and Thermal Performance
This MCCB is rated for 630 A continuously at ambient temperatures up to 50 °C. Above that, the thermal element begins to derate: 618 A at 55 °C, 607 A at 60 °C, 595 A at 65 °C, and 583 A at 70 °C. If the panel ambient runs hot — say, near a transformer or in a non-conditioned enclosure — use the 55 °C or 60 °C column for your load calculation, not the 40 °C figure. Maximum power dissipation at rated load is 193 W, which must be factored into the enclosure's thermal budget. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage limits govern handling and warehousing, not running conditions.
Interrupting Capacity and Selectivity
The 3VM1463-4EE32-0AA0 delivers 121 kA at 240 V, 76 kA at 415 V and 440 V, and 53 kA at 500 V. These are symmetrical RMS values. For a 480 V panel on a 100 kA available fault current, this breaker clears with margin. At 415 V, the 76 kA rating covers most utility transformer secondary faults in industrial plants. The TM220 release's fixed magnetic threshold means selectivity with downstream breakers is determined by the thermal curve overlap — coordination studies should verify the let-through energy (I²t) at the fault level.