Mitsubishi S-T35 AC Magnetic Contactor

The S-T35 belongs to mitsubishi MS-T Series, the upgraded successor model of S-N35, which is fully interchangeable with S-N35. It is an AC coil driven contactor widely used for three-phase motor start-stop and power circuit control in control cabinets.

✅ Especificaciones principales

Tamaño del marco: 35 marco, 3-contactos principales de polo

AC-3 rating at 380/400V: 18.5kilovatios, rated operating current 35A

Tensión máxima del circuito principal: CA690V

Standard built-in auxiliary contacts: 2NO + 2CAROLINA DEL NORTE (2a2b)

Dimensiones generales: 75(W.) × 89(h) × 91(D) milímetros, weight 0.55kg

Montaje: DIN rail mounting or screw fixing; mounting hole positions fully compatible with S-N35

Clase de protección: IP20

Resistencia mecánica: 10 millones de operaciones; Resistencia eléctrica (AC-3): aprox. 1 millones de operaciones

Coil voltage options (AC standard): CA 24V, CA 110 V., CA 220 V., CA380V, CA 400 V., CA 500 V., 50/60Hz universales

✅ Model Naming Rule

`S-T35 + Coil Voltage`

Ejemplo: S-T35 AC220V, S-T35 AC380V

Nota: S-T series is AC coil by default. DC coil version is SD-T series; no los mezcles.

✅ Comparison with S-N35

Corriente nominal del contacto principal, power rating and auxiliary contact configuration are identical

Mounting dimensions and drilling holes are interchangeable for direct replacement

Optimized coil pull-in performance, wider voltage tolerance range and lower power consumption; officially recommended replacement for S-N35

✅ Matching Accessories

Módulos de contactos auxiliares: UA, UN series (for contact expansion)

supresor de sobretensiones: Serie SZ (varistor / RC absorber to suppress coil back EMF)

Relé de sobrecarga térmica: TH-T35 (motor overload protection, emparejado para 35 marco)

Mechanical interlock unit: used for forward/reverse (revertir) circuito

✅ Escenarios de aplicación típicos

Máquinas de moldeo por inyección, fans & bombas de agua, líneas de producción, compresores de aire, Armarios de control de climatización, circuitos de potencia de máquina herramienta, direct start-stop control of three-phase asynchronous motors.

✅ Troubleshooting Guide

1. Bobina energizada pero sin tracción: Verificar el voltaje de la bobina, check loose wiring, test burnt coil
2. Humming noise after pull-in: Undervoltage supply, dust/rust on iron core mating surfaces
3. Severe main contact arcing & burning: Overload beyond AC-3 rating, pérdida de fase, cambio frecuente, damaged arc shield
4. Unstable auxiliary contact signals: Oxidized contact surface, insufficient terminal tightening torque

✅ Cross-Brand Equivalent Models

Schneider LC1D38, Siemens 3RT2035, OMRON CJX2-32

1. Terminal Definition of S-T35 (Standard 2a2b)

Circuito principal (Incoming top, outgoing bottom)

L1, L2, L3 (Lado de la fuente de alimentación); T1, T2, T3 (Lado de carga, connected to TH-T35 thermal relay input terminals)

Terminales de bobina

A1, A2: bobina de CA. Two A2 terminals are internally shorted for easy jumper wiring.

Contactos auxiliares incorporados (2NO+2NC)

✅ Normally Open (NO): 13-14, 43-44

✅ Normally Closed (CAROLINA DEL NORTE): 21-22, 31-32

Tamaño del tornillo: Main circuit M4; Bobina & auxiliary contacts M3.5

2. Basic Self-Locking Wiring Diagram (S-T35 + TH-T35 Thermal Relay, Motor Start-Stop)

Circuito principal

3-phase power → Circuit breaker → S-T35 L1/L2/L3 → S-T35 T1/T2/T3 → TH-T35 thermal relay input → Thermal relay output → Motor M

Circuito de control (AC220V example)

1. L → Stop button (CAROLINA DEL NORTE) → Botón de inicio (NO) → S-T35 A1
2. N → S-T35 A2
3. Self-locking: Paralelo 13-14 (NO) across the start button
4. Protección contra sobrecarga: Wire TH-T35 95-96 (CAROLINA DEL NORTE) in series into the control circuit; the coil will cut off when overload trips

Full Model List of MS-T Series

1) Non-Reversing Standard Models (S-T, your S-T35 is included)

Coil suffix options: CA 24V / CA 110 V. / CA 220 V. / CA380V; p.ej. S-T35 AC220V

2) invertir (Adelante/Reversa) Integrated Models (S-2×T with built-in interlock)

S-2×T10, S-2×T12, S-2×T20, S-2×T21, S-2×T25, S-2×T32, S-2×T35, S-2×T50, S-2×T65, S-2×T80, S-2×T100

3) Modelos Derivados Especiales (Mismo cuadro, estructura diferente)

1. DC Coil Version (SD-T, not interchangeable with S-T)

SD-T10, SD-T12, SD-T20, SD-T21, SD-T25, SD-T32, SD-T35, SD-T50, SD-T65, SD-T80, SD-T100

2. Mechanical Latching Type (SL-T): Pull-in on energization, keep closed after power cut; only released when control circuit is disconnected

SL-T21, SL-T35, SL-T50, SL-T65, SL-T80, SL-T100

3. Off-Delay Release Type (S-T□DL)

S-T12DL, S-T21DL, S-T35DL

1. Matching Thermal Overload Relays (TH-T Series, frame-matched one-to-one)

TH-T18 (for T10/T12/T20)

TH-T25 (for T21/T25/T32)

TH-T35 (for S-T35)

TH-T50 (for T50)

TH-T65 (for T65/T80)

TH-T100 (for T100)

III. Magnetic Starters (Integrated contactor + relé térmico)

No reversible: MSO-T10, MSO-T12, MSO-T20, MSO-T21, MSO-T25, MSO-T32, MSO-T35, MSO-T50, MSO-T65, MSO-T80, MSO-T100

invertir: MSO-2×T10 …… MSO-2×T100

1. Regla de nomenclatura del modelo (S-T□)

S = Contactor

T = MS-T Series (replaces old S-N series)

Numeral = Frame current rating (10/12/20/21/25/32/35/50/65/80/100)

Sufijo: voltaje de la bobina (AC220V/AC380V); DL = Off-delay release; SL = Mechanical latch; SD = DC coil

1. Cross-Replacement Table with Old S-N Series (Reemplazo directo)

S-T10 ↔ S-N10

S-T12 ↔ S-N12

S-T20 ↔ S-N20

S-T21 ↔ S-N21

S-T25 ↔ S-N25

S-T32 ↔ S-N32

S-T35 ↔ S-N35 (tu modelo)

S-T50 ↔ S-N50

S-T65 ↔ S-N65

S-T80 ↔ S-N80

S-T100 ↔ S-N100