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Basic Product Information
Marke: SAMWHA EOCR (Schneider Korea)
Produkttyp: EOCR-SS Series Knob-type Electronic Motor Protector (Replaces traditional thermal overload relays)
- Model Code Breakdown of EOCRSS-60NW7PQ
| Segment | Code | Definition |
| EOCRSS | Serie | SS Economy Integrated Through-Core Motor Protector |
| 60 | Aktuelle Bewertung | Built-in CT, adjustable rated current: 5.0～60A, compatible with 1.5～30kW three-phase motors |
| N | Protection Mode | Type N Fail-Safe: Contacts open and contactor trips upon protector power loss or fault; Type R does not trip when power fails |
| W7 | Stromversorgung | W7 = Wide Voltage AC 180～480V (Suitable for 380/400/440V industrial three-phase power grids) |
| P | Kontaktkonfiguration | P = Standard changeover contacts: 95(NC)/97(NEIN) (1 Normalerweise geöffnet + 1 Normalerweise geschlossen) |
| Q | Additional Function | Q = Built-in Modbus-RTU RS485 communication; supports PLC/DCS remote monitoring, real-time current reading and fault code retrieval |
Grundlegende technische Spezifikationen
Grundlegende technische Spezifikationen3.1 Aktuell & Time Adjustment
Aktueller Bereich: 5～60A (10:1 wide adjustment ratio)
D-Zeit (Start Stall Delay): 0.2～30s adjustable to avoid false tripping caused by high motor starting current
O-Zeit (Overload Trip Delay): 0.2～30s adjustable to match motor thermal characteristic curves
3.2 Schutzfunktionen
- Überlast & Überstromschutz (O-Time delayed trip)
- Three-Phase Phase Loss Protection (Instant trip)
- Stallschutz (D-Zeit + O-Time dual delay)
- Three-Phase Current Unbalance Protection
3.3 Elektrische Spezifikationen
Operating Power Supply: AC 180～480V (W7 wide voltage)
Ausgangskontakte: 5A/250VAC changeover contacts (95NC, 96COM, 97NEIN)
Kommunikation: RS485 Modbus RTU (Exclusive to Q suffix models)
Dielektrische Spannungsfestigkeit: 2kV for 1 Minute
Stromverbrauch: ≤250mA
3.4 Umfeld & Installation
Betriebstemperatur: -20℃～+60℃; Lagertemperatur: -30℃～+80℃
Luftfeuchtigkeit: 30%～85%RH, nicht kondensierend
Montage: Standard 35mm DIN rail or screw fixing
Hauptstromkreis: Two through-core CTs (Pass L1 and L2 through protector windows)
- Front Panel Knobs & Indicators
- LOAD(A): Motor rated current adjustment knob (5～60A)
- D-TIME: Start delay (Prevent false tripping during startup)
- O-ZEIT: Overload trip delay
- Green PWR LED: Power supply normal
- Red TRIP LED: Fault tripping (Number of flashes indicates fault type)
- RESET: Manual reset button; PRÜFEN: Unit self-test button
- Key Differences of PQ Suffix (vs Standard 60NW7)
- Built-in RS485 Modbus communication: Remotely read real-time operating current, fault logs and protector status; receive remote reset commands from upper computer
- PCB of Q model integrates communication terminals, supporting multi-protector bus networking
- Ideal for automated production lines, Pumpstationen, central air conditioning and centralized monitoring control rooms
- Typische Anwendungsszenarien
380V three-phase fans, Wasserpumpen, Luftkompressoren, belt conveyors and mixing motors
Motors with rated current 5～60A, no external current transformer required
Control cabinets requiring PLC remote motor data collection and remote fault reset
- Verkabelungsrichtlinien
- Hauptstromkreis: Run motor phase wires L1 and L2 through the two CT windows of the protector; L3 does not need to pass through
- Power Terminals A1/A2: Connect to AC380V control power supply
- Steuerkreis: 96COM as common terminal; wire 95NC normally closed contact in series with contactor coil (Type N opens on power loss); connect 97NO normally open contact to fault alarm indicator light
- RS485 Communication: A/B differential bus, daisy-chain wiring for multiple devices
- Fehlerbehebungsmatrix
| Fehlerphänomen | Grundursache | Lösungen |
| TRIP LED stays lit and cannot be reset | Continuous overload / motor stall | Belastung reduzieren, increase set current, check mechanical jamming |
| TRIP LED flashes twice | Phasenverlust | Inspect main circuit fuses, contactor contacts and motor wiring |
| Keine Reaktion nach dem Einschalten, PWR LED off | Abnormal power supply to A1/A2 | Measure 380V power supply, replace the protector |
| No Modbus communication data | A/B wires reversed / duplicate device addresses | Swap RS485 A/B polarity, set unique address for each device |
- Alternative Models in the Same Series
- Non-communication version: EOCRSS-60NW7P (No RS485, geringere Kosten)
- 24–240V power supply version: EOCRSS-60NS7PQ (S7 = 24~240V AC/DC)
- Höhere Stromstärke: For motors over 60A, select EOCRSS-100 series with external CT
