Siemens 3RV1021-4AA10 Sirius Motor Protection Relay

Siemens Sirius 3RV1021-4AA10 is a 3-pole motor protection circuit breaker (size S0) designed to guard three‑phase motors from overloads and short circuits. It combines thermal and magnetic trip logic with an A‑release mechanism and uses screw terminals for straightforward wiring. The device is rated for 690 V insulation, with a short‑circuit release current of 208 A, and a nominal current range of 11–16 A, suitable for motors in the 11–16 A range. It features IP20 front protection, an ambient operating range of -20 to 70 C, and a 6 kV impulse withstand, along with approximately 100,000 mechanical switching cycles. This model is part of the Sirius 3RV1 family and carries a Class 10 trip characteristic, making it a compact, reliable protection option for small to mid‑size motors in control panels. Auxiliary switches are not included with this variant, and Siemens notes a successor model, 3RV2021-4AA10, for future replacements. Typical applications include motor protection in manufacturing lines, conveyors, and packaging equipment where space constraints demand a compact, screw‑terminal device with proven overload and short‑circuit protection.