Siemens SIRIUS 3RV1021‑1EA10 motor protection circuit breaker, size S0, adjustable 2.8–4A Class 10 trip, brand new and never used in the original Siemens box. This unit combines manual motor switching with thermal overload and magnetic short‑circuit protection for three‑phase motors up to 690 V AC.
Brand: Siemens
Family: SIRIUS 3RV10 motor starter protectors
Model: 3RV1021‑1EA10
Type: Motor protection circuit breaker / manual motor starter
Frame size: S0
Current adjustment range (A‑release): 2.8–4A via front dial
Short‑circuit release (N‑release): 52A instantaneous
Tripping class: Class 10
Rated operational voltage: up to 690 V AC, 50/60 Hz
Terminals: screw terminals for lines and load (L1, L2, L3 / T1, T2, T3)
Features: rotary ON/OFF handle, TRIPPED indicator, TEST button for function check
Standards: IEC 60947‑1/‑2/‑4‑1, GB14048‑2.
New old stock; breaker has never been installed or wired.
Supplied in original Siemens cardboard box; carton shows noticeable shelf dirt, discoloration and edge wear from storage but is intact.
Device front, terminals and selector dial appear clean with sharp markings; unit remains seated in its factory packing.
Suitable for protecting motors with full‑load current between 2.8 and 4A; buyer should match setting to motor nameplate and coordinate with contactors and upstream fuses.
Part of the modular SIRIUS system and can be combined with Siemens contactors and accessories as a compact motor starter.
