Its job is to clear faults before they cascade upstream, and the breaking capacities here are the numbers that tell you whether it holds coordination with the upstream transformer or generator. That thermal curve matters if this breaker lives near other heat sources or in a non-climate-controlled enclosure. The overcurrent release is the TM210, a thermal-magnetic design — thermal for overloads, magnetic for short-circuits. No electronic trip unit here, so no adjustable curves or communication. Simple, field-proven, and less to fail in a high-vibration environment.
Breaking capacity — the real selectivity numbers
At 240 V this breaker interrupts 121 kA. At 415 V it manages 75.6 kA. At 440 V it drops to 52.5 kA, and at 690 V it's 11.9 kA. These are the values you need for a selectivity study — not the catalogue Icu alone, but the actual system voltage you're coordinating.
Width is 101.6 mm, height 130 mm, depth 70 mm. No auxiliary contact is fitted as standard (order code 3VA9608-0BB25 if you need remote status). An undervoltage release (UVR) is included; verify the coil voltage against your control supply before wiring. This is a straight line-protection breaker — thermal-magnetic, no electronics.