Schneider Samwha EOCR 3CT-H2-200-C 三相統合変流器

サムハ EOCR from Korea, integrated into the シュナイダー EOCR product line, made in Korea, exclusively for EOCR motor protection relays.

モデルの定義

3CT: Three-phase integrated 変流器 with three through-hole cores

H2: サイズコード, corresponding to the cable window for 200A model

200: Primary rated current: 200 あ

C: Old version suffix; Z is the new replacement model (3CT-H2-200-Z). Electrical parameters are identical, only version revision, direct plug-and-play replacement.

コアの電気仕様

Transformation ratio: 200/5 あ

精度等級: クラス 3.0

Rated burden: 1.25 バージニア州 (Version C) / 5 バージニア州 (New Version Z)

頻度: 50/60 Hz

耐電圧: 1150 V

Short-time thermal stability: 40Ith / 1 2番

絶縁抵抗: ≥10 MΩ @ 500 ワシントンDCで

適用回路: 交流 600 V motor circuit

重さ: 約. 580 g

全体の寸法

W150 mm × H55 mm × D71 mm

Integral epoxy encapsulation, three circular cable holes; DINレール / panel mounting

Secondary terminals: Q1, K2 (three independent windings for each phase); secondary wire: 1.5~4 mm² flexible cable

応用 & マッチング

✅ Designed exclusively for: EOCR-3DE, FDE, SSD, 3MZ and other digital motor protection relays. It samples three-phase current to implement overload, 位相損失, locked rotor and current unbalance protection.

✅ Application scenarios: Three-phase asynchronous motor control cabinets, ファン, ウォーターポンプ, compressors and conveyor power circuits.

❌ Not suitable for energy metering (クラス 3 accuracy for protection only, not for measurement).

モデルの選択 & 交換

New in-stock replacement: 3CT-H2-200-Z, direct replacement for 3CT-H2-200-C

Other models in the same series:

3CT-H1-100-Z: 100/5 あ

3CT-HH-150-Z: 150/5 あ

3CT-H3-300-Z: 300/5 あ

3CT-H4-400-Z: 400/5 あ

設置ガイドライン
Run the main power cable directly through the three holes; P1 = supply side, P2 = motor side. Polarity reversal will cause phase error and false phase-loss tripping. CT secondary circuit must never be open-circuited.
Use only identical 3CT models with one relay; do not mix CTs with different transformation ratios.
周囲温度: -20 ～ +60 ℃; Max altitude: 2000 メートル.
Wiring Instruction for 3CT-H2-200-C (新モデル: 3CT-H2-200-Z)

Three-phase integrated CT with independent secondary windings for R/S/T phases, secondary output 5 あ. Only compatible with EOCR motor protectors; cannot be connected to ordinary ammeters or metering devices.

端子の定義

Primary side: Three holes for L1(R), L2(S), L3(T) power cables

Polarity rule: P1 (電源) → P2 (モーター負荷); arrow points toward the load. Reversed polarity leads to phase fault and incorrect phase-loss alarm.

Secondary terminals (3 groups from top to bottom):

R phase: Q1, K2

S phase: Q1, K2

T phase: Q1, K2

Secondary cable: 1.5~4 mm² flexible wire; shielded twisted pair is recommended; cable length ≤ 15 メートル.

標準配線 (EOCR-3DE / FDE / 3MZ / iFMZ / i3MZ)

R-phase K1 → EOCR I1; R-phase K2 → common COM terminal
S-phase K1 → EOCR I2; S-phase K2 → common COM terminal
T-phase K1 → EOCR I3; T-phase K2 → common COM terminal

✅ All three K2 terminals are tied together to the protector’s current COM; single-point grounding at the COM terminal is recommended.

❌ Never allow secondary open circuit (will cause accuracy drift and insulation breakdown).

Note on mechanical life: 用語 “機械的寿命” only applies to devices with moving contacts and mechanical structures (接触器, サーキットブレーカー, リレー). 変流器 (CT) and voltage transformers (PT) are static components without moving parts. Their service indicators are insulation life, thermal stability and environmental durability only.

メンテナンス & 交換周期 (On-site O&M Reference)

Normal environment (ファン & ポンプ, clean indoor cabinet): Evaluate replacement after 8~12 years

過酷な環境 (高温, ほこり, VFD circuits, frequent direct-on-line motor starting): Check insulation and transformation ratio every 5~7 years

After short-circuit heavy current impact: Test or replace immediately. The iron core will suffer hidden performance degradation, resulting in current sampling deviation and false tripping of the protector.

補足

New model 3CT-H2-200-Z shares the same mechanical structure, iron core and encapsulation as version C, with identical durability. Only the rated burden is upgraded from 1.25 VA to 5 バージニア州, making it more stable for long secondary cables and VFD applications. Mounting holes are fully interchangeable with no cabinet modification required.

Naming Rule for 3CT-H Series Three-Phase Integrated CT

形式: 3CT-XX-XXX-Suffix

3CT: 三相複合変流器 (EOCR dedicated)

H1/HH/H2/H3/H4: サイズコード (cable window dimension)

Numeral: Primary current (secondary output 5 あ)

サフィックス: C = Old version (製造中止); Z = New version (active replacement)

正確さ: クラス 3.0; Secondary output: 5 あ; Compatible with all EOCR motor protectors.

全モデルリスト (Old C-version + New Z-version, one-to-one match)

完全な仕様 (ascending current rating)

3CT-HS-75, 比率: 75/5 あ

Old: 3CT-HS-75-C (製造中止)

新しい: 3CT-HS-75-Z (生産中)

3CT-H1-100, 比率: 100/5 あ

Old: 3CT-H1-100-C (製造中止)

新しい: 3CT-H1-100-Z (生産中)

3CT-HH-150, 比率: 150/5 あ

Old: 3CT-HH-150-C (製造中止)

新しい: 3CT-HH-150-Z (生産中)

3CT-H2-200 (あなたのモデル), 比率: 200/5 あ

Old: 3CT-H2-200-C (製造中止)

新しい: 3CT-H2-200-Z (direct interchange)

3CT-H3-300, 比率: 300/5 あ

Old: 3CT-H3-300-C (製造中止)

新しい: 3CT-H3-300-Z (生産中)

3CT-H4-400, 比率: 400/5 あ

Old: 3CT-H4-400-C (製造中止)

新しい: 3CT-H4-400-Z (生産中)

Key Differences between C-version & Z-version

Old suffix -C: Rated burden 1.25 バージニア州, limited short secondary wiring length

New suffix -Z: Rated burden upgraded to 5 バージニア州, better stability for long cables and VFD circuits; mounting footprint fully compatible for drop-in replacement without cabinet changes.