접촉기,회로 차단기,태양광 인버터,전기 계량기,태양 전지
Samwha EOCR-PFZ Motor Protection Relay
모델 비교: EOCRPFZ-WRDUH VS EOCRPFZ-H2DZ7W
Coding Rule for PFZ Series
`EOCRPFZ [CT 등급][연락처 구성][표시하다][제어 전원][기능][의사소통][트립 곡선][Terminal/Housing Type]`
- Model Suffix Breakdown
1) EOCRPZ-WRDUH
여: Built-in CT range 0.5～100A (W-type CT)
아르 자형: Relay contact layout: Trip contact OL (1아니요+1NC) + Alarm contact AL (1아니요)
디: 디지털 디스플레이
유: Control supply AC/DC 85～264V universal wide voltage
시간: Integrated zero-sequence ZCT, earth fault protection supported
👉 No suffix Z = standard version; without special trip curve code, no Curve 7
2) EOCRPZ-H2DZ7W
시간: Built-in CT range 0.5～60A (H-type CT) ✅【Key Difference 1】
2: 연락처 구성: Two independent changeover contact sets ✅【Key Difference 2】
디: 디지털 디스플레이
지: Built-in Modbus-RTU RS485 communication port ✅【Key Difference 3】
7: Special thermal protection curve (customized I²t overload & motor starting characteristic parameters, Curve No.7) ✅【Key Difference 4】
여: 주택 / feed-through terminal type
⚠️ 중요 참고 사항:
EOCRPFZ-WRDUH has no Z code → no RS485 communication;
EOCRPFZ-H2DZ7W with Z suffix = factory-fitted Modbus communication.
- Main Comparison Table
| 비교항목 | EOCRPZ-WRDUH | EOCRPZ-H2DZ7W |
| Built-in CT Measuring Range | 0.5～100A | 0.5～60A |
| 제어 전원 공급 장치 | AC/DC 85～264V wide universal range | Typically AC100~240V (confirm upon order, wide voltage not guaranteed) |
| Output Relay Contacts | OL: 1아니요+1NC; 알: 1아니요 | Two sets of changeover contacts (2×NO/NC), more contact terminals |
| 총 3 contact points | ||
| Modbus RS485 Communication | ❌ Not supported | ✅ Standard onboard communication; allows PLC remote reading of current & 오류 코드 |
| Overload Protection Curve | Standard universal curve | Special No.7 trip curve (optimized for heavy-start loads: 파쇄기, air compressors etc.) |
| 지락 보호 | Built-in ZCT, earth fault available | Built-in ZCT, earth fault available (동일한 기능) |
| 4～20mA Analog Output | Dual-channel 4–20mA output | Dual-channel 4–20mA output |
| Direct Interchangeability | ❌ Not plug-and-play | ❌ Not plug-and-play |
| Differences in measuring range, contact definition, communication and terminal layout |
- 선택 & On-site Replacement Guidelines
- Measuring Range Priority
EOCRPFZ-WRDUH max range 100A; EOCRPFZ-H2DZ7W max 60A.
Never use H2DZ7W if motor rated current exceeds 60A.
- Communication Requirement as Key Criterion
If remote current monitoring, fault signal acquisition or remote parameter setting via PLC is required → choose H2DZ7W (with Z communication).
Only local protection without upper system communication → EOCRPFZ-WRDUH is acceptable.
- Rewiring Required for Contact Circuits
Terminal assignments and contact numbers differ between the two models. Direct replacement will cause control circuit malfunction. Drawings and wiring must be rechecked and modified.
- Match Trip Curve with Load Type
No.7 curve version (접미사 7) is preferred for crushers and heavy-duty long-start motors; standard curve WRDUH is sufficient for ordinary fans and water pumps.
- Brief Summary
- 측정 범위: WRDUH = 0.5–100A; H2DZ7W = 0.5–60A
- 의사소통: H2DZ7W supports Modbus; WRDUH has no communication
- 콘택트 렌즈: H2DZ7W equipped with two changeover contact sets; WRDUH adopts standard 1OL+1AL contacts
- Protection curve: H2DZ7W uses special No.7 curve for heavy startup loads
- 전원공급장치: WRDUH supports wide AC/DC 85~264V input for better compatibility
