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Basic Product Information
Brand: SAMWHA EOCR (Schneider Korea)
Product Type: EOCR-SS Series Knob-type Electronic Motor Protector (Replaces traditional thermal overload relays)
- Model Code Breakdown of EOCRSS-60NW7PQ
| Segment | Code | Definition |
| EOCRSS | Series | SS Economy Integrated Through-Core Motor Protector |
| 60 | Current Rating | 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 | Power Supply | W7 = Wide Voltage AC 180～480V (Suitable for 380/400/440V industrial three-phase power grids) |
| P | Contact Configuration | P = Standard changeover contacts: 95(NC)/97(NO) (1 Normally Open + 1 Normally Closed) |
| Q | Additional Function | Q = Built-in Modbus-RTU RS485 communication; supports PLC/DCS remote monitoring, real-time current reading and fault code retrieval |
Core Technical Specifications
Core Technical Specifications3.1 Current & Time Adjustment
Current Range: 5～60A (10:1 wide adjustment ratio)
D-Time (Start Stall Delay): 0.2～30s adjustable to avoid false tripping caused by high motor starting current
O-Time (Overload Trip Delay): 0.2～30s adjustable to match motor thermal characteristic curves
3.2 Protection Functions
- Overload & Overcurrent Protection (O-Time delayed trip)
- Three-Phase Phase Loss Protection (Instant trip)
- Stall Protection (D-Time + O-Time dual delay)
- Three-Phase Current Unbalance Protection
3.3 Electrical Specifications
Operating Power Supply: AC 180～480V (W7 wide voltage)
Output Contacts: 5A/250VAC changeover contacts (95NC, 96COM, 97NO)
Communication: RS485 Modbus RTU (Exclusive to Q suffix models)
Dielectric Withstand Voltage: 2kV for 1 minute
Power Consumption: ≤250mA
3.4 Environment & Installation
Operating Temperature: -20℃～+60℃; Storage Temperature: -30℃～+80℃
Humidity: 30%～85%RH, non-condensing
Mounting: Standard 35mm DIN rail or screw fixing
Main Circuit: 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-TIME: Overload trip delay
- Green PWR LED: Power supply normal
- Red TRIP LED: Fault tripping (Number of flashes indicates fault type)
- RESET: Manual reset button; TEST: 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, pump stations, central air conditioning and centralized monitoring control rooms
- Typical Application Scenarios
380V three-phase fans, water pumps, air compressors, 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
- Wiring Guidelines
- Main Circuit: 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
- Control Circuit: 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
- Troubleshooting Matrix
| Fault Phenomenon | Root Cause | Solutions |
| TRIP LED stays lit and cannot be reset | Continuous overload / motor stall | Reduce load, increase set current, check mechanical jamming |
| TRIP LED flashes twice | Phase loss | Inspect main circuit fuses, contactor contacts and motor wiring |
| No response after power-on, 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, lower cost)
- 24–240V power supply version: EOCRSS-60NS7PQ (S7 = 24~240V AC/DC)
- Higher current rating: For motors over 60A, select EOCRSS-100 series with external CT
