Mitsubishi S-T35 AC Magnetic Contactor

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

✅ 핵심사양

프레임 크기: 35 액자, 3-극 주요 접점

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

최대 주회로 전압: AC690V

Standard built-in auxiliary contacts: 2아니요 + 2NC (2a2b)

전체 치수: 75(여) × 89(시간) × 91(디) mm, 무게 0.55kg

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

보호 등급: IP20

기계적 내구성: 10 백만 개의 작업; 전기적 내구성 (AC-3): 대략. 1 백만 개의 작업

Coil voltage options (AC standard): AC24V, AC110V, AC220V, AC380V, AC400V, AC500V, 50/60헤르츠 범용

✅ Model Naming Rule

`S-T35 + Coil Voltage`

예: S-T35 AC220V, S-T35 AC380V

메모: S-T series is AC coil by default. DC coil version is SD-T series; 그것들을 섞지 마세요.

✅ Comparison with S-N35

주접점 정격전류, 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

보조 접점 모듈: UA, UN series (for contact expansion)

서지 억제기: SZ series (varistor / RC absorber to suppress coil back EMF)

열과부하 계전기: TH-T35 (motor overload protection, 일치하는 35 액자)

Mechanical interlock unit: used for forward/reverse (반전) 회로

✅ Typical Application Scenarios

사출 성형기, 팬 & 물 펌프, 생산 라인, 공기 압축기, HVAC control cabinets, machine tool power circuits, direct start-stop control of three-phase asynchronous motors.

✅ 문제 해결 가이드

1. Coil energized but no pull-in: 코일 전압 확인, check loose wiring, test burnt coil
2. Humming noise after pull-in: 저전압 공급, dust/rust on iron core mating surfaces
3. Severe main contact arcing & 타고 있는: Overload beyond AC-3 rating, 위상 손실, 빈번한 전환, damaged arc shield
4. Unstable auxiliary contact signals: Oxidized contact surface, insufficient terminal tightening torque

✅ Cross-Brand Equivalent Models

Schneider LC1D38, Siemens 3RT2035, 오므론 CJX2-32

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

주회로 (Incoming top, outgoing bottom)

L1, L2, L3 (Power supply side); T1, T2, T3 (부하측, connected to TH-T35 thermal relay input terminals)

코일 터미널

A1, A2: AC 코일. Two A2 terminals are internally shorted for easy jumper wiring.

내장 보조 접점 (2아니요+2NC)

✅ Normally Open (아니요): 13-14, 43-44

✅ Normally Closed (NC): 21-22, 31-32

Screw size: Main circuit M4; 코일 & auxiliary contacts M3.5

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

주회로

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

제어 회로 (AC220V example)

1. L → Stop button (NC) → 시작 버튼 (아니요) → S-T35 A1
2. N → S-T35 A2
3. Self-locking: 평행한 13-14 (아니요) across the start button
4. 과부하 보호: Wire TH-T35 95-96 (NC) 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: AC24V / AC110V / AC220V / AC380V; 예를 들어. S-T35 AC220V

2) 반전 (정방향/역방향) 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) 특수 파생 모델 (Same frame, different structure)

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 + 열 릴레이)

Non-reversing: MSO-T10, MSO-T12, MSO-T20, MSO-T21, MSO-T25, MSO-T32, MSO-T35, MSO-T50, MSO-T65, MSO-T80, MSO-T100

반전: MSO-2×T10 …… MSO-2×T100

1. 모델 명명 규칙 (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)

접미사: 코일 전압 (AC220V/AC380V); DL = Off-delay release; SL = Mechanical latch; SD = DC coil

1. Cross-Replacement Table with Old S-N Series (직접 드롭인 교체)

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 (당신의 모델)

S-T50 ↔ S-N50

S-T65 ↔ S-N65

S-T80 ↔ S-N80

S-T100 ↔ S-N100