Transformer Protection Circuit Breaker with CLASS 10 Trip
Rated operating voltage covers 20 to 690 V, and it handles continuous currents up to 59 A at both 480 V and 600 V — so it's sized for medium-power distribution transformers feeding motor control centers or lighting panels. Breaking capacity hits 65 kA at 240 V and 400 V AC, dropping to 8 kA at 500 V and 2 kA at 690 V — the 400 V figure is the one that matters for most European and Asian distribution panels.
Width is 55 mm — that's three standard 18 mm module slots, so plan for it in a crowded enclosure. Depth is 149 mm, height 140 mm. Main circuit terminals are screw-type, accepting 2x 1–35 mm² or 1x 1–50 mm² solid or stranded copper. Torque to M6 specs — clean termination, no spring-clip surprises.
Environmental and Operating Limits
Maximum switching rate is 15 operations per hour at AC-3 or AC-3e duty — fine for transformer switching, not for a high-cycle motor start application. That matches the transformer protection role — phase loss is the primary risk, and ground fault is handled downstream.
Lifecycle status is current production — this is an active Siemens catalog number, not a phase-out or NRND line item.