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    AI Overview
    The
    Siemens 3RV2021-4EA10 isn't a PLC programming controller but a SIRIUS Motor Protection Circuit Breaker (MPCB), a component used with PLCs for motor protection, offering disconnect, overload, and short-circuit protection in one device (S0 size, 27-32A). It's a physical device for industrial automation, not software for programming; you can find new ones from suppliers like eBay and TME.eu. 
    What it is: 
    • Motor Protector: Protects motors from overcurrents and short circuits.
    • Self-Protected Combination Controller: Combines disconnect, overload, and short-circuit functions (Type E).
    • SIRIUS Series: Part of Siemens' modular industrial control system.
    • Specifications: Size S0, 27-32 Amp setting, Class 10 tripping, 400A N-release, 690V AC. 
    What it's not (and why the confusion): 
    • Not a PLC: It doesn't run logic programs like a PLC (e.g., S7-1200/1500).
    • "PLC Programming Controller" Misnomer: Some sellers list it with "PLC" because it's used in PLC-controlled systems for motor starting/protection, leading to confusion in search terms. 
    Where to find new ones: 
    • Industrial Suppliers: Kent Electrical Supply, IMC-Direct.
    • Online Marketplaces: eBay, Alibaba.
    • Automation Distributors: TME.eu, PLC-City. 
    • Siemens 3RV2021-4EA10 Motor Protector - Kent Electrical Supply
      Product Description. Siemens 3RV2021-4EA10 motor starter protector with an adjustable AMP range from 27 to 32 AMPS, a rotary ON/OF...
      Kent Electrical Supply
    • 3RV2021-4EA10 | Siemens - PLC-City
      Technical specifications. Width 45 mm. Height 97 mm. Depth 97 mm. Number of poles 3. Rated operating voltage 690;690 V. Rated perm...
      PLC-City
    • NEW 3RV2021-4EA10 Siemens With 1 Year warranty ... - eBay
      NEW 3RV2021-4EA10 Siemens With 1 Year warranty US STOCK. PLC-PLAZA (114) 97.9% positive feedback. $141.42. As low as $48.24/mo wit...
      eBay
    • Siemens 3RV2021-4EA10 motor starter | 27 to 32A - IMC-Direct
      Sep 15, 2025 — The 3RV2021-4EA10 MSP's are UL approved as Self Protected Combination Motor Controllers which are also called Type E. ...
      IMC-Direct
    • 3RV2021-4EA10 SIEMENS - Motor breaker | 15kW - TME.eu.
      3RV2901-1A, 3RV2901-1B, 3RV2901-1C, 3RV2901-1D, 3RV2901-1E, 3RV2901-1F, 3RV2901-1J, 3RV2902-1AB4, 3RV2902-1AB0, 3RV2902-1AF0, 3RV2...
      TME
    • 3RV2021-4EA10 - Siemens - PLC Hardware
      Siemens 3RV2021-4EA10 circuit-breaker sz s0, for motor protection, class 10, a-release 27...32a, n-release 400a, screw connection,
      www.plchardware.com
    • New Original Ready 3RV2021-4EA10 Warehouse Industrial ...
      New Original Ready 3RV2021-4EA10 Warehouse Industrial Automation PLC Programming Controller. Share. No reviews yet. Model Number (
      www.alibaba.com
    • 3RV2021-4EA10 – SIEMENS - Control Parts
      Nov 24, 2025 — SIEMENS SIRIUS - 3RV2021-4EA10 MOTOR PROTECTORS - CONTACTORS The Siemens 3RV2021-4EA10is a circuit breaker / motor pro...
      Control Parts
    • Siemens - 3RV2021-4EA10 CIRCUIT BREAKER SIZE S0 ...
      The comprehensive range of accessories, such as auxiliary switches,auxiliary releases, signaling switches etc. is standardized for...
      Kempston Controls
    • Siemens 3RV2021-4EA10 Motor Protector - Kent Electrical Supply
      Product Description. Siemens 3RV2021-4EA10 motor starter protector with an adjustable AMP range from 27 to 32 AMPS, a rotary ON/OF...
      Kent Electrical Supply
    • 3RV2021-4EA10 | Siemens - PLC-City
      Technical specifications. Width 45 mm. Height 97 mm. Depth 97 mm. Number of poles 3. Rated operating voltage 690;690 V. Rated perm...
      PLC-City
    • NEW 3RV2021-4EA10 Siemens With 1 Year warranty ... - eBay
      NEW 3RV2021-4EA10 Siemens With 1 Year warranty US STOCK. PLC-PLAZA (114) 97.9% positive feedback. $141.42. As low as $48.24/mo wit...
      eBay
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