Schneider Samwha EOCR 3CT-H2-200-C Three-Phase Integrated Current Transformer

Samwha EOCR from Korea, integrated into the Schneider EOCR product line, made in Korea, exclusively for EOCR motor protection relays.

Definizione del modello

3CT: Three-phase integrated trasformatore di corrente with three through-hole cores

H2: Codice taglia, corresponding to the cable window for 200A model

200: Primary rated current: 200 UN

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

Specifiche elettriche principali

Transformation ratio: 200/5 UN

Classe di precisione: Classe 3.0

Rated burden: 1.25 VA (Version C) / 5 VA (New Version Z)

Frequenza: 50/60 Hz

Resistere alla tensione: 1150 V

Short-time thermal stability: 40Ith / 1 secondo

Resistenza di isolamento: ≥10 MΩ @ 500 A DC

Circuito applicabile: AC 600 V motor circuit

Peso: ca. 580 G

Dimensioni complessive

W150 mm × H55 mm × D71 mm

Integral epoxy encapsulation, three circular cable holes; Guida DIN / montaggio a pannello

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

Applicazione & Corrispondenza

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

✅ Application scenarios: Three-phase asynchronous motor control cabinets, tifosi, pompe dell'acqua, compressors and conveyor power circuits.

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

Selezione del modello & Sostituzione

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 UN

3CT-HH-150-Z: 150/5 UN

3CT-H3-300-Z: 300/5 UN

3CT-H4-400-Z: 400/5 UN

Linee guida per l'installazione
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.
Temperatura ambiente: -20 ~ +60 ℃; Max altitude: 2000 M.
Wiring Instruction for 3CT-H2-200-C (Nuovo modello: 3CT-H2-200-Z)

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

Definizione del terminale

Primary side: Three holes for L1(R), L2(S), L3(T) cavi di alimentazione

Polarity rule: P1 (Alimentazione elettrica) → P2 (carico del motore); 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 M.

Cablaggio standard (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: Il termine “vita meccanica” only applies to devices with moving contacts and mechanical structures (contattori, interruttori automatici, relè). Trasformatori di corrente (CT) and voltage transformers (P.T) are static components without moving parts. Their service indicators are insulation life, thermal stability and environmental durability only.

Manutenzione & Ciclo di sostituzione (On-site O&M Reference)

Normal environment (fan & pompa, clean indoor cabinet): Evaluate replacement after 8~12 years

Ambiente duro (alta temperatura, polvere, 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.

Nota integrativa

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 VA, 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

Formato: 3CT-XX-XXX-Suffix

3CT: Trasformatore di corrente combinato trifase (EOCR dedicated)

H1/HH/H2/H3/H4: Codice taglia (cable window dimension)

Numeral: Primary current (secondary output 5 UN)

Suffisso: C = Old version (interrotto); Z = New version (active replacement)

Precisione: Classe 3.0; Secondary output: 5 UN; Compatible with all EOCR motor protectors.

Elenco completo dei modelli (Old C-version + New Z-version, one-to-one match)

Full Specifications (ascending current rating)

3CT-HS-75, Rapporto: 75/5 UN

Vecchio: 3CT-HS-75-C (interrotto)

Nuovo: 3CT-HS-75-Z (nella produzione)

3CT-H1-100, Rapporto: 100/5 UN

Vecchio: 3CT-H1-100-C (interrotto)

Nuovo: 3CT-H1-100-Z (nella produzione)

3CT-HH-150, Rapporto: 150/5 UN

Vecchio: 3CT-HH-150-C (interrotto)

Nuovo: 3CT-HH-150-Z (nella produzione)

3CT-H2-200 (Il tuo modello), Rapporto: 200/5 UN

Vecchio: 3CT-H2-200-C (interrotto)

Nuovo: 3CT-H2-200-Z (direct interchange)

3CT-H3-300, Rapporto: 300/5 UN

Vecchio: 3CT-H3-300-C (interrotto)

Nuovo: 3CT-H3-300-Z (nella produzione)

3CT-H4-400, Rapporto: 400/5 UN

Vecchio: 3CT-H4-400-C (interrotto)

Nuovo: 3CT-H4-400-Z (nella produzione)

Key Differences between C-version & Z-version

Old suffix -C: Rated burden 1.25 VA, limited short secondary wiring length

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