MCCB for high-current line protection
The Siemens SENTRON 3VA2463-5JP32-0DA0 is a 3-pole molded case circuit breaker rated at 630 A continuous current at 40 °C, with an ETU550 electronic trip unit for adjustable protection curves.
The continuous current rating is temperature-dependent: 630 A at 40 °C, derating to 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C. Maximum power loss is 164.5 W. For a panel OEM, this means the breaker needs adequate ventilation or forced cooling if ambient in the enclosure exceeds 40 °C — the derating curve is the real-world limit, not the 630 A nameplate.
Breaking capacity varies with system voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V. For most 400 V industrial networks, the 121 kA rating covers high-fault scenarios.
Physical integration and environment
Dimensions: 248 mm height, 138 mm width, 110 mm depth. Front protection class IP40. Includes undervoltage release and communication function. Rated insulation voltage 800 V.