63 A MCCB with ETU560 — what the ratings mean for fit
The Siemens 3VA2063-5JQ36-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. That flat thermal curve simplifies panel design: you size the bus and lugs for 63 A and don't recalculate for elevated enclosure temperatures. The 3-pole unit carries an ETU560 electronic trip unit, which gives you adjustable long-time (tr 0.5–25 s) and short-time delay settings, plus a communication function for integration into a monitored distribution system. Breaking capacity is the headline number that decides whether this breaker clears a fault or welds shut. At 240 V it interrupts 187 kA — a figure that covers virtually any low-voltage fault on a typical 480Y/277 V secondary. At 415 V and 440 V it still holds 121 kA, dropping to 76 kA at 500 V and 3 kA at 690 V. For a 63 A frame, those are high-interrupting ratings; you'd specify this variant when the available fault current at the panelboard exceeds what a standard 25 kA or 50 kA MCCB can handle.
Panel integration — dimensions and mounting
The 3VA2063-5JQ36-0AA0 measures 105 mm wide, 181 mm high, and 86 mm deep — a 3-pole frame that fits standard MCCB mounting patterns in distribution panels and motor control centers. Front-face protection is IP40, meaning tools or fingers won't contact live parts from the front, but the enclosure itself must provide the overall panel IP rating. The 5.4 W maximum power loss at rated current is modest; for a multi-breaker lineup, sum the losses and check the panel thermal rise, but at this per-unit figure it rarely drives ventilation requirements.
Trip unit and adjustability
The ETU560 electronic trip unit provides adjustable long-time delay (tr 0.5–25 s) and a communication function.