Siemens 3RV2021-1CA10 Manual Motor Protector 3 Pole

Siemens 3RV2021-1CA10 Manual Motor Protector is a three‑pole motor protection device from the Sirius 3RV2 family designed to shield small three‑phase motors from overload with an integrated manual disconnect. This size S0 unit is compatible with 220–690 VAC systems and features an adjustable overload trip range of 1.8–2.5 A to match a motor’s full‑load current, while the main circuit is rated up to 33 A. It delivers a short‑circuit breaking capacity of 65 kA at 480 VAC and uses screw terminals for straightforward field wiring; by default it includes no auxiliary contacts, but optional accessories such as a 2‑pole auxiliary contact (3RV2901) are available. Typical applications include protecting motors around a few tenths of a kilowatt in compact control panels, with 0.75 kW at 400 VAC cited as a representative example, where a combined protection and disconnect function is advantageous. The device carries Class 10 thermal overload protection and is intended for DIN rail mounting, consolidating motor protection, switching, and manual disconnection in a single compact module.