Siemens3RA6120-2CB32

Model Code Explanation

1. Specifiche tecniche principali

Dati elettrici

Tipo: SIRIUS Compact Load Feeder / Direct On-Line Starter

Tensione nominale: 690 V e, 3-fase

Tensione di controllo: 24 V CA/CC (50/60 Hz)

Corrente operativa nominale: 1–4 A

Motor power rating: 1.5 kW a 400 V, 3 kW a 690 V

Contatti ausiliari: 1 NO + 1 NC

Protezione: Electronic overload protection, protezione da cortocircuito

Grado di protezione: IP20

Mechanical Data

Larghezza: 45 mm

Montaggio: Standard 35 mm DIN rail mounting (screw and clip fixing)

Peso: ca. 1.51 kg (3.335 libbre)

Tipo di connessione: Main circuit-spring-loaded terminals; Auxiliary circuit-spring-loaded terminals

III. Ambiente operativo

Applicazioni tipiche

Control of small fans and pumps

Light-duty equipment such as conveyors and mixers

HVAC control in building automation systems

Auxiliary equipment control in industrial automation production lines

Replacement of conventional contactor + thermal relay combinations to save cabinet space

1. Modelli sostitutivi e confronto tra marchi

Siemens Replacement in Same Series

Replacement Models from Other Brands

1. Informazioni ufficiali sugli ordini

Official order number: 3RA6120-2CB32 (globally unified)

Product status: Active product (PLM: PM300)

Minimum packaging: 1 unit/package

Certificazioni: CE, UL, CSA and other international certifications

1. Complete Model List for 3RA61 Series (1–4 A Range)

VII. Engineering Recommendations and Risk Warnings

Note di installazione

1. Orientamento di montaggio: Vertical installation preferred; 10% derating required for horizontal installation
2. Spazio di dissipazione del calore: Reserve at least 5 mm on both sides for adequate cooling
3. Specifiche di cablaggio: Main circuit conductor cross-section 0.5–2.5 mm²; auxiliary circuit 0.5–1.5 mm²
4. Circuito di controllo: Surge suppressor recommended to protect against voltage spikes

Risks in Cross-Brand Replacement

1. Ensure overload protection curve matches the motor to avoid protection failure
2. Spring-loaded and screw terminals are not directly interchangeable; rewiring and retightening required
3. Electronic overload parameters must be reset according to motor nameplate data
4. Short-circuit protection characteristics may vary between brands; short-circuit withstand rating must be verified

Punti di manutenzione

1. Regularly check terminal tightness, soprattutto in ambienti vibranti
2. Clean dust from the device surface to maintain heat dissipation
3. Periodically test overload protection function
4. Consider voltage stabilizer if control voltage fluctuates beyond ±10%

VIII. Riepilogo

Il Siemens 3RA6120-2CB32 è un compatto, contattore combinato avviatore diretto in linea integrato, protezione da cortocircuito e protezione elettronica da sovraccarico. È progettato per piccoli motori trifase (1.5 kW a 400 V, 3 kW a 690 V). Featuring spring-loaded terminals for quick wiring and a narrow 45 mm width to save cabinet space, its 24 V AC/DC wide-range control voltage supports various automation systems.

Typical Applications of Siemens 3RA6120-2CB32

This is a Siemens SIRIUS compact direct on-line starter with a rated current of 1–4 A, suitable for low-power three-phase motors, especially in applications requiring small motors, light loads and compact installation space.

1. Fan Applications

Small axial fans, cabinet cooling fans

Fans for air conditioning units, fresh air system fans

Small smoke exhaust fans, cooling fans

2. Pump Applications

Small booster pumps, circulation water pumps

Cooling water pumps, lubrication pumps

Make-up pumps for hydraulic systems

3. Conveying and Light Industry Machinery

Small belt conveyors, roller conveyors

Feeders, small elevators

Macchine per l'imballaggio, labeling machines, small conveyors

4. Machine Tools and Automation Auxiliaries

Machine tool cooling pumps, lubrication pumps

Small chip conveyors

Drive motors for tooling and fixtures

5. Cibo, Packaging and Textile Light Industry

Small mixers and blenders

Textile small rollers, feeding mechanisms

Small drive motors for food processing

6. Building and HVAC Systems

Drive for small valve actuators

Air handling unit fans, coil fans

Small water treatment supporting equipment

7. General Industrial Auxiliaries

Small fans, vibration motors

Auxiliaries for small air compressors

Auxiliary drive motors for various equipment

Suitable for all applications involving three-phase small motors up to approximately 1.5 kW a 400 V with current 1–4 A, requiring direct starting, sovraccarico + protezione da cortocircuito, and compact size with fast wiring.