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.

Modelldefinition

3CT: Three-phase integrated current transformer with three through-hole cores

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

200: Primary rated current: 200 A

C: Old version suffix; Z is the new replacement model (3CT-H2-200-Z). Elektrische Parameter sind identisch, only version revision, direct plug-and-play replacement.

Grundlegende elektrische Spezifikationen

Transformation ratio: 200/5 A

Genauigkeitsklasse: Klasse 3.0

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

Frequenz: 50/60 Hz

Spannung standhalten: 1150 V

Short-time thermal stability: 40Ith / 1 zweite

Isolationswiderstand: ≥10 MΩ @ 500 In DC

Anwendbarer Stromkreis: Wechselstrom 600 V motor circuit

Gewicht: ca. 580 G

Gesamtabmessungen

W150 mm × H55 mm × D71 mm

Integral epoxy encapsulation, three circular cable holes; DIN-Schiene / Panelmontage

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

Anwendung & Passend

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

✅ Application scenarios: Three-phase asynchronous motor control cabinets, Fans, Wasserpumpen, compressors and conveyor power circuits.

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

Modellauswahl & Ersatz

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 A

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

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

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

Installationsrichtlinien
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.
Umgebungstemperatur: -20 ~ +60 ℃; Max altitude: 2000 M.
Wiring Instruction for 3CT-H2-200-C (Neues Modell: 3CT-H2-200-Z)

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

Terminaldefinition

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

Polarity rule: P1 (Stromversorgung) → P2 (Motorlast); 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.

Standardverkabelung (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: Der Begriff “mechanisches Leben” only applies to devices with moving contacts and mechanical structures (Schütze, Leistungsschalter, Relais). Stromwandler (CT) and voltage transformers (PT) are static components without moving parts. Their service indicators are insulation life, thermal stability and environmental durability only.

Wartung & Austauschzyklus (On-site O&M Reference)

Normale Umgebung (Lüfter & Pumpe, clean indoor cabinet): Evaluate replacement after 8~12 years

Raue Umgebung (hohe Temperatur, Staub, 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.

Ergänzende Anmerkung

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

Format: 3CT-XX-XXX-Suffix

3CT: Dreiphasiger kombinierter Stromwandler (EOCR dedicated)

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

Numeral: Primary current (secondary output 5 A)

Suffix: C = Old version (eingestellt); Z = New version (active replacement)

Genauigkeit: Klasse 3.0; Secondary output: 5 A; Compatible with all EOCR motor protectors.

Vollständige Modellliste (Old C-version + New Z-version, one-to-one match)

Full Specifications (ascending current rating)

3CT-HS-75, Verhältnis: 75/5 A

Alt: 3CT-HS-75-C (eingestellt)

Neu: 3CT-HS-75-Z (in der Produktion)

3CT-H1-100, Verhältnis: 100/5 A

Alt: 3CT-H1-100-C (eingestellt)

Neu: 3CT-H1-100-Z (in der Produktion)

3CT-HH-150, Verhältnis: 150/5 A

Alt: 3CT-HH-150-C (eingestellt)

Neu: 3CT-HH-150-Z (in der Produktion)

3CT-H2-200 (Ihr Modell), Verhältnis: 200/5 A

Alt: 3CT-H2-200-C (eingestellt)

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

3CT-H3-300, Verhältnis: 300/5 A

Alt: 3CT-H3-300-C (eingestellt)

Neu: 3CT-H3-300-Z (in der Produktion)

3CT-H4-400, Verhältnis: 400/5 A

Alt: 3CT-H4-400-C (eingestellt)

Neu: 3CT-H4-400-Z (in der Produktion)

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.