What it is and what it does
The Siemens 3RV1011-1EA10-ZW98 is a SIRIUS motor protection circuit breaker designed for motor protection, combining a circuit breaker and overload relay in one device. It provides Class 10 trip protection, meaning it will trip within 10 seconds at 7.2× the thermal setting — fast enough to protect standard induction motors during a stall or locked-rotor condition without nuisance tripping on normal starts. Rated for a voltage range of 20 to 690 V, it delivers a 100 kA breaking capacity at both 240 V and 400 V — that is the maximum fault current it can safely interrupt without welding its contacts or rupturing the housing. At 690 V the breaking capacity is 2 kA, which still covers most industrial distribution panel fault levels. Phase failure detection is built in, so if one phase drops out the breaker trips before the motor single-phases and burns out. No ground fault detection on this variant — that is the ZW98 suffix's story: a special version without the ground-fault module.
Mounting and integration
Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715. The 45 mm width (three module spaces) and 75 mm depth fit standard panel layouts; any mounting position is allowed, so you can orient it vertically or horizontally in a crowded enclosure. Clearance requirements: 20 mm upwards and downwards, 9 mm at the sides, zero forwards or backwards. That 9 mm side gap is tight — adjacent devices can sit nearly flush, but you still need room for the screwdriver on the M3 main contact terminals. Terminals accept 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²) solid or stranded wire — typical for control circuit connections. The screw-type terminals are rated for the main current circuit.