SIEMENS 3RT1056-6AP36 Power Contactor

SIRIUS 3RT series 3-contactor de alimentación de CA de polo, Size S6, main circuit busbar connection, AC/DC 220~240V coil, built-in 2NO+2NC auxiliary contacts

1. Decodificación de modelos

3RT1056-6AP36

3RT: SIRIUS power contactor series

10: Standard contactor (non-safety, non-reversing type)

56: Frame size S6, AC-3 400V 185A

6: Coil voltage 220…240V AC/DC

A: Main circuit busbar connection

PAG: Screw terminals for auxiliary contacts

36: Contactos auxiliares 2 Normalmente abierto + 2 Normalmente cerrado (2NO+2NC)

2. Especificaciones eléctricas básicas

3. Ámbito de aplicación

On/off control of 3-phase motors such as fans, bombas de agua y compresores

Control cabinets, aire acondicionado central, industrial production lines and power cabinets

Can be matched with 3RU thermal overload relay for motor overload protection; 3RT19 surge suppressor for coil EMC interference suppression

4. Modelos alternativos
5. Doméstico SIEMENS reemplazo: 3RT5056-6AP36

Función idéntica, current rating and coil specification. Hecho en china, direct replacement for 3RT1056-6AP36 with identical mounting dimensions, officially recommended replacement model

2. Upgraded model in same series: 3RT1064-6AP36 (AC-3 225A, 110kilovatios)
3. Downsized model in same series: 3RT1055-6AP36 (AC-3 150A, 75kilovatios)

Nota: 3RT1056 manufactured in Germany; 3RT5056 manufactured domestically. Fully compatible in electrical performance and mounting hole layout, direct interchangeable in projects.

5. Instalación & Pautas de mantenimiento
6. Instalación: Montaje vertical, tilt ≤ ±5°. Heat dissipation clearance required. S6 frame generates considerable heat; derating is required for multiple units mounted side-by-side inside cabinet.
7. Circuito principal: Busbar connection, tighten to specified torque per datasheet to prevent overheating and contact burning.
8. Bobina: Wide-range AC/DC coil, compatible for AC and DC control. 3RT19 surge suppression module is recommended in parallel to reduce interference to PLC digital outputs.
9. Contact life: Under AC-3 motor duty, mechanical life approx. 10 millones de operaciones; electrical life depends on breaking current.
10. Solución de problemas

Bobina energizada pero sin tracción: Medir el voltaje de la bobina, check coil open circuit or mechanical jamming

Pull-in but no continuity on main circuit: Loose busbar or burned main contacts

Chattering / ruido anormal: Bajo voltaje de la bobina, accumulated dust on iron core, fatiga primaveral

6. Código arancelario aduanero

85364900 (Electromagnetic contactor)

7. Optional Spare Parts & Accesorios

Relé de sobrecarga térmica: 3RU2156 series (for 90kW motor)

supresor de sobretensiones: 3RT1955-1CD00 (circuito RC), 3RT1955-1DG00 (varistor)

Auxiliary contact block: 3RH1951 (for extra auxiliary contacts)

Arc shield & main contact repair kit: 3RT1956 contact assembly

Tabla comparativa: SIEMENS 3RT1056-6AP36 VS 3RT5056-6AP36

Both models feature identical electrical parameters, mounting dimensions and compatible accessories for direct replacement. The core differences lie in origin, nameplate marking, lead time and applicable certifications.

Notas clave

1. Intercambiabilidad: SIEMENS officially approves direct replacement. No modification required for cabinet cutout, barra colectora, secondary control loop or thermal relay selection. Electrical characteristic curve, temperature rise and contact breaking capacity are identical.
2. Guía de selección

✅ Choose 3RT5056: Domestic projects, budget control, entrega rápida; preferred for most domestic panel building projects.

✅ Choose 3RT1056: Maquinaria de exportacion, overseas site, specification explicitly requiring German origin, mandatory UL/CSA certification.

3. Misconception Clarification: It is NOT a downgraded domestic variant. Same product platform and design, manufactured at different factories under identical design and test standards.

Suplementario: Shared Spare Parts List

Relé de sobrecarga térmica: 3RU2156 series

supresor de sobretensiones: 3RT1955-1CD00 / 3RT1955-1DG00

Main contact repair kit: 3RT1956

Additional auxiliary contact block: 3RH1951

Application Scenarios for 3RT1056-6AP36 and 3RT5056-6AP36

Identical load capacity for both models, rated for 400V, 90kW 3-phase motor direct-on-line start (AC-3, 185A). Differences are only based on project location, certification requirements and client procurement specification, NOT load capacity.

1. Common Applications (Both Models Applicable)

(1) Direct-on-line Motor Starting (Main AC-3 Duty)

bombas de agua, bombas de aguas residuales, circulating pumps (tratamiento de agua, climatización, edificio, industria química)

Compresores de aire, grandes fans, extractores de humo

Transportadores, mezcladores, extrusoras, trituradoras (alimento, building material, minería)

Chillers and large refrigeration compressors for central air conditioning

MCC motor control centre drawer units for 90kW motor circuits

(2) Carga resistiva AC-1

High-power heating elements, hornos de resistencia

Main circuit switching of high-power circuits inside distribution cabinets

(3) AC-6B Capacitor Switching

Capacitor bank switching for reactive power compensation cabinet (reactor required to suppress inrush current)

Pareo: 3RU thermal relay for motor overload protection; 2NO+2NC auxiliary contacts for PLC running feedback and fault interlock.

2. Preferred Scenarios for 3RT5056-6AP36 (Domestic Local Version)
3. Domestic panel projects, domestic factories, climatización, suministro de agua & drenaje, general factory automation

Complete CCC certification for domestic projects, sufficient stock and cost advantage, preferred by most EPC and cabinet manufacturers.

2. Domestic municipal projects: Plantas de tratamiento de aguas residuales, municipal pump stations, building HVAC cabinets
3. Domestic machinery OEM: aficionados, compresores de aire, chiller units sold in domestic market
4. Ordinary motor circuits in domestic power plants, metallurgy and chemical plants (no mandatory imported component requirement by client)
5. Retrofit replacement for old contactors, tight budget and fast delivery required

✅Adecuado para: Domestic projects without mandatory UL/CSA certification or German origin requirement

3. Preferred Scenarios for 3RT1056-6AP36 (German Imported Version)
4. Maquinaria de exportacion & equipo (export to Southeast Asia, Middle East, Europe and other overseas sites)

Full set of international certifications CE, UL, CSA to meet overseas owner and customs requirements.

2. New construction projects of foreign-invested factories where technical specification explicitly requires SIEMENS components made in Germany
3. Overseas EPC projects, control cabinets exported together with equipment, certificate of origin required
4. High-end pharmaceutical and semiconductor foreign projects where imported components are specified by client
5. Reemplazo de piezas de repuesto para equipos antiguos: Original unit fitted with 3RT1056 and client requires identical OEM spare parts

✅Adecuado para: Maquinaria de exportacion, overseas projects, client specified imported components, mandatory UL/CSA certification

4. Cómo evitar errores en la selección
5. Identical load rating: Both can drive 90kW motors. 3RT5056 has no limitation for heavy-duty applications; only differs in origin and certification documents.
6. For domestic projects without “imported contactor” clause in specification, 3RT5056 is preferred for shorter lead time and better price.
7. For export to Europe / América del norte, select 3RT1056 and confirm in advance whether UL/CSA certificates are required.
8. Heavy vibration & dusty heavy industry environments (minería, cement plant): Both have identical mechanical life. Installation and heat dissipation requirements are the same; selection only depends on origin requirement.
9. Escenarios no aplicables

Direct-on-line starting for motor power exceeding 90kW; soft starter recommended for higher power.

Frequent jogging, frequent forward/reverse AC-4 duty (accelerated contact wear, derating evaluation required)

Safety circuits and emergency stop safety functions (SIEMENS safety contactor 3RT2 series should be adopted)