MCCB for line protection — 63 A continuous, 52.5 kA interrupting at 240 V
The Siemens 3VA1063-2ED42-0CA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection, carrying a continuous current rating of 63 A at 40 °C and derating to 58 A at 70 °C. Its interrupting capacity reaches 52.5 kA at 240 V, 32 kA at 415 V, and 7.5 kA at 690 V — figures that govern selectivity coordination in a distribution panel. The 4-pole construction with an undervoltage release (UVR) means this breaker drops out when supply voltage falls below the dropout threshold, protecting downstream loads from brownout damage. The TM210 thermal-magnetic release provides fixed thermal and magnetic trip settings, so no field-adjustable trip unit — set it and commission it.
Breaking capacity and thermal derating — what the ratings mean for panel coordination
At 240 V the breaker clears 52.5 kA symmetrical; at 415 V that drops to 32 kA, and at 690 V it holds at 7.5 kA. These are the maximum fault currents the breaker can interrupt without welding contacts or rupturing the arc chamber — critical for series coordination with downstream breakers. The 63 A rating holds flat from 40 °C to 50 °C; above that it derates linearly to 58 A at 70 °C. In a panel with ambient near 60 °C, expect 61 A continuous capability. The 800 V rated insulation voltage (Ui) covers most 480/277 V and 600 V systems with margin.
Dimensions and panel fit — 70 mm depth, 101.6 mm width, 130 mm height
The breaker measures 70 mm deep, 101.6 mm wide, and 130 mm high. The 4-pole width (101.6 mm) is standard for a 4-pole MCCB in this frame size — it occupies four 25.4 mm module positions on a DIN rail or panel-mount footprint. The 70 mm depth leaves clearance for rear busbars or cable ducts in a typical 200 mm deep enclosure. No trip indicator or communication module is fitted; the undervoltage release is the only auxiliary release.