What it is and what it does
The Siemens 3VA2063-6HM36-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection — meaning it sits at the distribution point to protect downstream cables and equipment from overloads and short circuits, not as a motor starter. It carries a continuous current rating of 63 A at 40 °C through 70 °C ambient — no derating needed across that temperature band, which simplifies panel design in warm enclosures. Breaking capacity is 242 kA at 240 V AC, dropping to 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3 kA at 690 V — the 690 V figure is low, so verify system voltage before specifying; this breaker is not suited for high-fault 690 V feeders.
Three-pole, fixed thermal-magnetic trip
Three-pole construction with a fixed thermal-magnetic trip unit: the continuous rating is fixed at 63 A, and the adjustable thermal pickup range runs from 16 A minimum up to the 63 A full-scale. Rated insulation voltage is 800 V, which covers most low-voltage distribution systems up to 690 V phase-to-phase. Maximum power loss is 5.4 W — negligible for thermal budgeting in a panel. No undervoltage release, no communication function, no trip indicator, and no voltage trigger — this is a basic thermal-magnetic MCCB without accessories or remote monitoring. Ground-fault monitoring is via summation current formation on the L-conductor.
Dimensions and panel fit
Footprint: 105 mm wide, 181 mm tall, 86 mm deep — 4.13 by 7.13 by 3.39 inches. That depth includes the breaker body; allow extra clearance for cable bending and arc-chamber venting per Siemens mounting guidelines. Snap-on DIN rail mounting is standard for the 3VA series — the 105 mm width occupies about six module spaces on a DIN rail.
Lifecycle and sourcing
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The 70 °C operating maximum matches the continuous-current derating curve — no surprise there.