Siemens SENTRON 3VA1063-4ED36-0BH0 — 63 A Molded Case Circuit Breaker, Line Protection
The Siemens SENTRON 3VA1063-4ED36-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated for a continuous current Iu of 63 A at ambient temperatures up to 50 °C, with a rated insulation voltage Ui of 800 V. It carries a breaking capacity of 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that define its fault-interruption capability for line protection duty. This MCCB is fitted with a TM210 thermal-magnetic overcurrent release and includes an undervoltage release (UVR) as standard. The auxiliary contact configuration provides two auxiliary switches plus one trip alarm switch (HQ), giving the panel builder status feedback without an add-on module. The front face carries an IP40 protection rating, meaning it resists tools and small wires (≥1 mm) from entering the breaker enclosure — standard for panel-mount switchgear. The unit measures 130 mm high, 76.2 mm wide, and 70 mm deep, so it fits the standard SENTRON 3VA mounting footprint on a DIN rail or panel baseplate.
Thermal Derating and Ambient Temperature
The 63 A rating holds flat from 40 °C through 50 °C. Above that, the TM210 release begins to derate: 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. If the panel ambient runs above 50 °C, the continuous load must be sized against the derated figure, not the nameplate 63 A. The operating temperature range spans -25 °C to 70 °C; storage limits are -40 °C to 80 °C. The storage range is wider because the breaker is not carrying current or switching during storage — that limit governs handling, not running.
Lifecycle and Sourcing
No official successor has been issued for this order code. The SENTRON 3VA series remains the active platform for Siemens molded case circuit breakers in this frame size.