The Siemens 3VA2010-5HL36-0CA0 is a SENTRON 3VA2 molded case circuit breaker rated for 100 A continuous current (Iu) across a 3-pole configuration, fitted with an ETU320 line protection trip unit. It carries an undervoltage release (UVR) as the auxiliary release — that's the -0CA0 suffix telling you it's built for applications where a loss of control voltage needs to drop the main breaker open, not just signal an alarm.
SCCR and thermal derating — what the numbers mean for your panel
Short-circuit breaking capacity is voltage-dependent: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 3.4 kA at 690 V. At 480 V (common in North American plants) you'd interpolate between the 440 V and 500 V figures — it's still a high-fault breaker. The 3.4 kA at 690 V is the weak point; if your system runs 690 V with high available fault current, this frame may not clear it. Thermal continuous current holds at 100 A from 40 °C through 50 °C ambient. Above that it derates: 96.25 A at 55 °C, 92.5 A at 60 °C, 88.75 A at 65 °C, and 85 A at 70 °C. If you're stuffing this into a hot enclosure next to drives or transformers, size the load at the derated figure, not the nameplate 100 A.
What the ETU320 trip unit does
The ETU320 is an electronic overcurrent release with LI (long-time and short-time) protection, no ground-fault function on this variant. It's line-protection only — no communication module, no phase-failure detection, no voltage trigger. The -0CA0 suffix adds the undervoltage release coil, which is a separate device (order code 3VA9608-0BB24) integrated at the factory. Maximum power loss at rated current is 16 W — negligible for enclosure heating but worth noting if you're packing a dozen of these in a small panel.