SIRIUS 3RV1011-0CA20-ZW97 motor protection circuit breaker — 0.25 A, CLASS 10, 100 kA
The Siemens 3RV1011-0CA20-ZW97 is a SIRIUS motor protection circuit breaker rated for 0.25 A continuous current with a CLASS 10 trip characteristic, meaning it clears overloads fast enough to protect standard induction motors during start-up without nuisance tripping. The 100 kA breaking capacity at 400 V AC means it can safely interrupt fault currents up to that level on a 400 V line — critical for high-fault panels where a weaker breaker would arc over. Three poles cover three-phase motor circuits, and phase failure detection is built in, so a lost phase trips the breaker instead of letting the motor single-phase and burn.
Mounting and panel integration
Snap-on mounting onto 35 mm DIN rail per DIN EN 50022 — standard for European control panels. The 45 mm width occupies one 45 mm module slot; depth is 81 mm, height 90 mm. Spring-loaded terminals on the main current circuit accept 2x (0.25... 2.5 mm²) solid or 2x (0.25... 1.5 mm²) finely stranded with ferrule. No clearance needed at the side or rear, so it fits tight enclosures. IP20 on the front — protected against finger contact, not washdown.
Key ratings and what they mean for selection
Rated continuous current 0.25 A — this breaker is sized for very small motor loads, fractional-horsepower pumps, fans, or small conveyors. The CLASS 10 trip class means it will hold during a normal motor start (typically 6–10 seconds of inrush) but trip fast on a sustained overload. Breaking capacity is 100 kA at 240 V, 400 V, 500 V, and 690 V AC — that is a high-interrupting rating for a 0.25 A device, so it can be used in panels with high available fault current without needing a current-limiting fuse upstream. Mechanical endurance is 100 000 cycles — rated for frequent switching applications. Power dissipation is 5.5 W total, 1.8 W per pole — factor into enclosure thermal calculations.
Duty ratings and operating conditions
Maximum operating frequency at AC-3 duty is 15 operations per hour — sufficient for motor starting cycles but not for rapid jogging. Ambient operating range is -20 to +60 °C; storage and transport range is -50 to +80 °C. Shock resistance is 25 g for 11 ms — suitable for mobile equipment or panels near rotating machinery. Maximum operating altitude is 2 000 m without derating.