Mitsubishi S-T35 AC200V Magnetic Contactor

The S-T35 AC200V is a 3-pole non-reversing contactor magnetic de Mitsubishi Electric MS-T Series. It has a rated current of 40A, compatible with 18.5kW @ 400V three-phase motors. Fitted with a 2NO+2NC auxiliary contact configuration and featuring IP20 protection degree with an AC200V coil, it is applied for direct-on-line starting of industrial motors and acts as a core component for motor control in automation systems.

1. Codul modelului Explicația

Definiție completă a modelului: S-T35 AC200V = Mitsubishi MS-T Series, frame size 35, AC200V coil, 3-pole 40A non-reversing magnetic contactor

2. Specificații tehnice de bază

3. Lista completă a modelelor (MS-T Series Non-reversing Contactors)

4. Modele de înlocuire & Comparația concurenților

4.1 Mitsubishi Internal Replacements

4.2 Comparație între concurenți între mărci

5. Medii de aplicație & Cazuri industriale

5.1 Aplicații recomandate

Controlul motorului industrial: Direct-on-line starting for three-phase motors such as pumps, fani, compresoare și transportoare

Echipament OEM: Supporting machine tools, utilaje de ambalare, printing machines and textile machinery

Sisteme electrice de clădire: Control of critical motors including air conditioning units, fire water pumps and drainage pumps

Industria generală: Motor control for production lines, automation equipment and material handling systems

Facilități comerciale: Control of refrigeration units, ventilation equipment and water pumps

5.2 Aplicații nerecomandate

Single-phase Motor Control: 3-pole design not suitable for single-phase circuits

Start-Stop de înaltă frecvență: Peste 1200 cycles per hour will shorten service life

Altitudine mare (>2000m): Derating required (10% reduction per 1000m elevation rise)

Severe Vibration Environments: Extra reinforcement is required to avoid malfunction

Corrosive Environments: IP20 protection is insufficient; additional enclosure is needed

5.3 Cazuri tipice de aplicare

Caz 1: Fan System in Food Processing Plant

Echipamente: 3 sets of 18.5kW centrifugal fans, 400V three-phase

Configurare: S-T35 AC200V + TH-T35 thermal overload relay + întrerupător cu carcasă turnată

Rezultat: Realizes sequential start-up and overload protection; the system operates stably with zero faults over 3 ani.

Caz 2: Water Pump Control in Wastewater Treatment Plant

Echipamente: 5 sets of 15kW submersible pumps, 400V three-phase

Configurare: S-T35 AC200V + PLC linkage control + GV2P32 motor circuit breaker

Caracteristici: Low power design reduces cabinet temperature rise; 2NO+2NC contacts meet the demands of status monitoring and alarm output.

6. Depanare & Maintenance Manual

6.1 Defecte comune & Soluții

6.2 Maintenance Procedures

1. Inspecție zilnică (Săptămânal)

Check appearance for abnormal heat, odour or noise

Ensure terminals are tight with no overheating marks

Test auxiliary contacts to confirm synchronous operation with main contacts

2. Întreținere de rutină (Fiecare 6 Luni)

Cut off power and remove dust from contactor and core surface

Inspect main and auxiliary contacts for burning and oxidation

Test coil resistance and insulation performance

3. Întreținere anuală

Check lubrication of mechanical parts and apply grease if needed

Verify operational flexibility and reliability

Retighten all electrical connections and replace aged components

6.3 Quick Diagnosis Tips

No pull-in? Check voltage and coil resistance first.

Loud noise? Clean core; replace if shading ring breaks.

Contacte arse? Limit current and reduce switching cycles.

Signal error? Inspect linkage and correct NO/NC wiring.

7. Selecţie & Ghid de instalare

7.1 Reguli de selecție

Potrivire curentă: Motor Full Load Current (FLA) ≤ 40A; optimal for 18.5kW @ 400V motors

Tensiunea bobinei: Confirm control circuit voltage is AC200V to avoid mismatch

Protection Coordination: Use with thermal overload relays (de ex. TH-T35) and motor circuit breakers

Derating for High Temperature: Derate 1% per ℃ above 40℃

7.2 Note de instalare

Direcția de montare: Instalare verticală (allowable deviation: ±15°) to guarantee arc extinguishing performance and mechanical life

Clearance: Reserve 10mm space on left & corect, 20mm on top & bottom for heat dissipation

Standard de cablare: 1.5-35mm² copper wire for main circuit (cuplu: 6-8Nm); 0.5-1.5mm² copper wire for control circuit (cuplu: 0.8-1.2Nm)

Interlock for Reversing Operation: Fit mechanical interlock to prevent phase short circuit

Protection for Harsh Environments: Install extra enclosure for dusty or humid conditions

8. Production Status & Soluții de înlocuire

Current Status of S-T35 AC200V: In production, no discontinuation plan (as of June 2026)

Upgrade & Opțiuni de înlocuire:

1. Upgrade funcțional: S-T35BC/SA series (built-in surge suppressor to reduce external components)
2. Intelligent Upgrade: Mitsubishi NF series (with communication function for remote monitoring)
3. Alternativă internă: Chint NXC-40, Delixi CDC1 series (lower cost with equivalent performance)

Application Cases of Mitsubishi S-T35 AC200V Magnetic Contactor

Featuring a 40A rated current, 2NO+2NC auxiliary contacts and low-power AC200V coil, the S-T35 AC200V is widely used for 18.5kW @ 400V three-phase motor control. It serves industries including water treatment, prelucrarea alimentelor, fabricarea de automobile, textile & dyeing, building HVAC, delivering reliable solutions for direct-on-line starting and status monitoring.

1. Overview of Main Application Fields

The S-T35 AC200V is compatible with 18.5kW @ 400V (or 11kW @ 220V) three-phase squirrel-cage induction motors. Typical applications are listed below:

2. Detailed Industry Application Cases

Caz 1: 1+1 Standby Control System for 15kW Submersible Pumps in Wastewater Treatment Plant

Contextul proiectului

Phase II project of an urban wastewater treatment plant. Five aeration tanks are equipped with 15kW submersible pumps for 24-hour continuous aeration. The system requires automatic duty/standby switching and automatic alarm upon faults.

Equipment Configuration

Main units: 5 sets of 15kW 400V three-phase submersible pumps

Control components: S-T35 AC200V contactor + TH-T35 thermal overload relay + GV2P32 motor circuit breaker + Mitsubishi FX3U PLC

Auxiliary components: GVAE11 auxiliary contact block (monitorizarea stării) + Audible & visual alarm + Manual/Auto selector switch

Solution Features

1. Design redundant: Independent control circuit for each pump to ensure uninterrupted operation
2. Status monitoring: 2NO+2NC contacts of S-T35 connect to PLC and alarm system for real-time status feedback
3. Energy saving: 18VA pull-in power and 3.8W holding power reduce energy consumption and cabinet temperature rise
4. Multi-level protection: Circuit breaker for short-circuit protection, thermal relay for overload protection and contactor for circuit breaking to ensure equipment safety

Application Results

Funcționare stabilă pentru 3 years with zero unplanned shutdown

Automatic switching time ≤ 2 secunde, meeting process continuity requirements

15% energy saving compared with traditional contactors

40% lower maintenance cost and high versatility of spare parts

Caz 2: Temperature Control System for 18.5kW Centrifugal Fans in Food Processing Plant

Contextul proiectului

The sterilization workshop of a dairy plant needs to maintain a constant temperature of 120℃. Three 18.5kW centrifugal fans are deployed to automatically adjust operating quantity according to ambient temperature for energy saving.

Equipment Configuration

Main units: 3 sets of 18.5kW 400V three-phase centrifugal fans

Control components: 3 × S-T35 AC200V contactors + Temperature sensors + PLC Mitsubishi + HMI

Protection components: Moulded case circuit breaker + Releu termic de suprasarcina + Phase sequence protection relay

Solution Features

1. Graded control: Automatically run 1/2/3 fans according to temperature ranges (≤115℃ / 115-125℃ / ≥125℃)
2. Pornire stea-delta: Reduces inrush current; the contactor withstands high starting impulse current effectively
3. Visualization: HMI displays real-time operating status, current and temperature of each fan
4. Maintenance reminder: Cumulative runtime recording reminds users of regular contactor maintenance

Application Results

Temperature control accuracy improved to ±1℃, product yield increased by 3%

22% economisirea energiei, saving approximately 120,000 RMB on electricity annually

Extended fan service life and reduced replacement frequency

Simplified operation with less manual intervention

Caz 3: Conveyor Interlock Control System in Auto Parts Factory

Contextul proiectului

The assembly line of an automotive seat factory consists of 12 conveyors driven by 15kW motors. The system requires sequential start-up from feed end to discharge end, reverse sequence shutdown, and full-line shutdown protection once any conveyor fails.

Equipment Configuration

Main units: 12 sets of 15kW 400V three-phase conveyor motors

Control components: 12 × S-T35 AC200V contactors + PLC Mitsubishi + 6 butoane de oprire de urgență + Safety relay

Signal system: 12 × GVAE11 auxiliary contact blocks (feedback de stare) + 24 lumini indicatoare (operation/fault)

Solution Features

1. Interlock logic: PLC realizes interlock between conveyors via contactor auxiliary contacts to prevent material accumulation
2. Safety design: Emergency stop signal directly cuts off coil power of all contactors with response time ≤ 0.1 doilea
3. Fast fault diagnosis: Contactor status uploaded to PLC for quick fault location
4. Design modular: Unified model reduces spare parts inventory and maintenance costs

Application Results

Production line failure rate reduced by 60%, production capacity increased by 15%

Average fault troubleshooting time shortened from 45 minute pentru a 5 minute

Improved operational safety with zero safety incidents

30% lower spare parts cost and higher maintenance efficiency

Caz 4: Dual-motor Control System for Carding Machine in Textile Mill

Contextul proiectului

Renovation of BEFAMA CRIII carding machine in a wool textile mill. The original 37kW wound rotor motor with large starting current is replaced by a 7.5kW + 11kW dual-motor drive (total power 18.5kW), requiring synchronous start and balanced load.

Equipment Configuration

Main units: 7.5kW + 11kW 400V three-phase dual motors

Control components: 2 × S-T35 AC200V contactors + Mitsubishi inverter + PLC + Current sensors

Protection components: 2 × thermal overload relays + Short-circuit protection circuit breaker

Solution Features

1. Load balancing: PLC monitors motor current via sensors and dynamically adjusts inverter output
2. Smooth start: Combined inverter and contactor reduces starting current from 68A to 28A and minimizes grid fluctuation
3. Energy-saving operation: Motor speed automatically adjusted according to load, 30% energy saved
4. Fault protection: Both contactors trip simultaneously if either motor is overloaded to avoid equipment damage

Application Results

Starting current reduced by 59%, eliminating grid fluctuation

30% economisirea energiei, saving approximately 80,000 RMB on electricity annually

Extended equipment service life, maintenance cycle prolonged to 1 an

Improved product quality and wool sliver uniformity by 2%

3. Application Classification & Ghid de selecție

3.1 In-depth Analysis of Applicable Scenarios

3.2 Scenarii nerecomandate & Alternative

4. Rezumat & Recomandări de selecție

4.1 Application Value Summary

Fiabilitate ridicată: 10 million mechanical cycles and 1 million electrical cycles (AC-3 40A/400V) for long-term industrial operation

Cost Efficiency: Consum redus de energie (18VA pull-in, 3.8W holding) cuts operational cost and heat generation inside cabinets

Flexibilitate: 2NO+2NC auxiliary contacts support status monitoring, alarm and interlock functions

Compatibilitate bună: Matches GV2/GV3 motor circuit breakers and TH-T thermal overload relays to form a complete protection system

4.2 Mnemonic de selecție

Ideal match for 18.5kW motors, S-T35 is your first choice

AC200V coil fits well, low power saves energy all the way

2NO plus 2NC contacts complete, for monitoring and alarm needs

IP20 solid protection, stable performance in industrial sites

4.3 Application Optimization Suggestions

1. Potrivirea protecției: Equip with thermal overload relays (de ex. TH-T35) and motor circuit breakers for dual protection against overload and short circuit.
2. Installation Standard: Montați vertical (±15°); reserve sufficient heat dissipation space (10mm left/right, 20mm top/bottom).
3. Specificații de cablare: 1.5-35mm² copper wire for main circuit (torque 6-8Nm); 0.5-1.5mm² copper wire for control circuit (torque 0.8-1.2Nm).
4. Ciclul de întreținere: Inspect contacts every 6 luni; replace frequently operated contactors annually.
5. High-temperature Adaptation: Derate 1% per ℃ when ambient temperature exceeds 40℃.