SIEMENS 3RT1056-6AP36 Power Contactor

SIRIUS 3RT series 3-극 AC 전원 접촉기, Size S6, main circuit busbar connection, AC/DC 220~240V coil, built-in 2NO+2NC auxiliary contacts

1. 모델 디코딩

3RT1056-6AP36

3RT: SIRIUS power contactor series

10: 표준 접촉기 (non-safety, 비가역형)

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

6: Coil voltage 220…240V AC/DC

에이: 주회로 버스바 연결

피: Screw terminals for auxiliary contacts

36: 보조 접점 2 평상시 열림 + 2 평상시 닫힘 (2아니요+2NC)

2. 핵심 전기 사양

3. 적용범위

On/off control of 3-phase motors such as fans, 워터 펌프 및 압축기

Control cabinets, central air conditioning, 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. 대체 모델
5. 국내의 지멘스 대사: 3RT5056-6AP36

동일한 기능, current rating and coil specification. 중국산, direct replacement for 3RT1056-6AP36 with identical mounting dimensions, officially recommended replacement model

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

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

5. 설치 & 유지 관리 지침
6. 설치: 수직 장착, tilt ≤ ±5°. Heat dissipation clearance required. S6 frame generates considerable heat; derating is required for multiple units mounted side-by-side inside cabinet.
7. 주회로: Busbar connection, tighten to specified torque per datasheet to prevent overheating and contact burning.
8. 코일: 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 백만 개의 작업; electrical life depends on breaking current.
10. 문제 해결

Coil energized but no pull-in: 코일 전압 측정, check coil open circuit or mechanical jamming

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

Chattering / 비정상적인 소음: 낮은 코일 전압, accumulated dust on iron core, 봄의 피로

6. Customs HS Code

85364900 (Electromagnetic contactor)

7. Optional Spare Parts & 부속품

열과부하 계전기: 3RU2156 series (for 90kW motor)

서지 억제기: 3RT1955-1CD00 (RC 회로), 3RT1955-1DG00 (Varistor)

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

Arc shield & 메인 접점 수리 키트: 3RT1956 contact assembly

비교표: 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.

주요 내용

1. 호환성: SIEMENS officially approves direct replacement. No modification required for cabinet cutout, 부스바, secondary control loop or thermal relay selection. Electrical characteristic curve, temperature rise and contact breaking capacity are identical.
2. 선택 지침

✅ Choose 3RT5056: 국내 프로젝트, budget control, 빠른 배송; preferred for most domestic panel building projects.

✅ Choose 3RT1056: 수출 기계, 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.

보충: Shared Spare Parts List

열과부하 계전기: 3RU2156 series

서지 억제기: 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, 185에이). 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)

워터 펌프, 하수 펌프, circulating pumps (수처리, 공조, 건물, 화학 산업)

공기 압축기, 대형 팬, 연기 배출 팬

컨베이어, 믹서, 압출기, 파쇄기 (음식, building material, 채광)

Chillers and large refrigeration compressors for central air conditioning

MCC motor control centre drawer units for 90kW motor circuits

(2) AC-1 Resistive Load

High-power heating elements, resistance furnaces

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)

어울리는: 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, 공조, 상수도 & 배수, 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: Wastewater treatment plants, municipal pump stations, building HVAC cabinets
3. Domestic machinery OEM: 팬, 공기 압축기, 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

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

3. Preferred Scenarios for 3RT1056-6AP36 (German Imported Version)
4. 수출 기계 & 장비 (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. 레거시 장비의 예비 부품 교체: Original unit fitted with 3RT1056 and client requires identical OEM spare parts

✅ 적합: 수출 기계, 해외 프로젝트, client specified imported components, mandatory UL/CSA certification

4. 선택 함정 회피
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 / 북아메리카, select 3RT1056 and confirm in advance whether UL/CSA certificates are required.
8. Heavy vibration & dusty heavy industry environments (채광, cement plant): Both have identical mechanical life. Installation and heat dissipation requirements are the same; selection only depends on origin requirement.
9. 적용할 수 없는 시나리오

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)