What this SIRIUS breaker does on the line
The Siemens 3RV1011-0HA10-ZW98 is a SIRIUS motor protection circuit breaker — designed specifically to protect motor feeders against overload and short-circuit. It carries a Class 10 trip characteristic, meaning it disconnects within 10 seconds at 7.2× the thermal setting, which is the standard match for standard induction motors during startup. The breaker handles a rated voltage range of 20 to 690 V AC and delivers a 100 kA breaking capacity at 400 V AC, so it can interrupt high-fault currents without needing an upstream fuse in most panel configurations. Phase failure detection is built in — if one phase drops out, the breaker trips, protecting the motor from single-phasing damage. There is no ground fault detection on this variant, so for applications requiring GF protection, you would add an external ground-fault relay or choose a different SIRIUS version.
Panel fit and mounting
The breaker measures 45 mm wide by 90 mm high by 75 mm deep — a standard 45 mm module that fits directly onto 35 mm DIN rail per DIN EN 60715, using either screw fixing or snap-on mounting. The mounting position is any orientation. Clearance requirements are minimal: 20 mm upwards, 20 mm downwards, 9 mm to the side, and 0 mm forwards or backwards. That means it fits tightly into a crowded enclosure without extra breathing space. Terminals are M3 screw-type for the main current circuit, accepting 2 × (0.5 to 1.5 mm²) or 2 × (0.75 to 2.5 mm²) solid or stranded wire. The operating temperature range is -20 to +60 °C, storage and transport from -50 to +80 °C.
Fuse coordination and switching frequency
At 240 V and 400 V, no upstream fuse is required — the breaker's own breaking capacity handles the fault. At 500 V and 690 V, the spec calls for a gL/gG 6 A backup fuse to maintain the 100 kA SCCR. Maximum switching frequency is 15 operations per hour under AC-3 and AC-3e duty, which is typical for motor-starting applications — not for frequent jogging or inching cycles.