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EOCR-SSD-C-30DMQ is a new-generation ultra-thin compact motor protector of SSD-C series launched by Schneider Electric (formerly Samwha Korea). It supports direct wiring within 3~30A, adopts AC220V control power supply, features digital display and Q-type three-phase peak current display. It is newly added with phase unbalance and phase sequence protection functions. With smaller size and higher precision, it is fully compatible to replace traditional SSD models. It is specially designed for compact cabinet layout under three-phase unbalanced operating conditions.
- Model Code Explanation
| Code Segment | Definition |
| EOCR | Electronic Over Current Relay, core category for motor protection |
| SSD-C | Solid State Digital Compact, upgraded compact solid-state digital type; ultra-thin DIN rail mounted, successor of standard SSD series |
| 30 | Current protection range: 3~30A, direct circuit wiring without external CT current transformer |
| D | Digital tube display, real-time visible current value and fault codes |
| M | Control power specification: AC220V±15%, 50/60Hz (industry standard M7 specification) |
| Q | Peak current display function: only displays the maximum current among three phases instead of average value, perfectly suitable for unbalanced loads |
- Core Technical Parameters
| Parameter Category | Specifications | Remarks |
| Brand | Schneider Electric (Original factory in Iksan, Korea, Samwha technology) | Authorized domestic distributor: Shanghai Hanshi Electric |
| Product Type | Compact solid-state digital protector for motor overload, phase loss and phase unbalance protection | Protection accuracy ±3%, better than ±5% of old SSD models |
| Rated Circuit Voltage | 690V AC (IEC) / 600V AC (UL) | Universal for low-voltage three-phase motors |
| Impulse Withstand Voltage | 6kV, compliant with IEC 60947-4-1 | Industrial surge resistance standard |
| Control Power Supply | AC220V±15% | Exclusive specification for suffix M |
| Total Power Consumption | ≤2.5W | Ultra-low power consumption, stable for long-term standby |
| Adjustable Current | 3~30A stepless continuous adjustment | Adjustment ratio: 10:1 |
| Full Protection Functions | Overload, phase loss, locked rotor, three-phase unbalance, abnormal phase sequence | Unbalance & phase sequence protection newly added in C series, unavailable on traditional SSD |
| Time Delay Parameters | Start delay D-Time: 0.2~30s; Trip delay O-Time: 0.2~10s | Wide adjustable range for heavy-duty starting motors |
| Output Contacts | 1NO+1NC (2SPST) | Contact rating: 3A/250VAC |
| Display Feature | Q version: flashing three-phase maximum current + fault code alarm | Quickly locate hidden single-phase overload risks |
| Overall Dimension | 40×72×105mm | Narrower than old SSD, saving 30% cabinet space |
| Installation Method | Standard 35mm DIN rail clip-on mounting | Direct wiring replacement for old SSD products |
| Protection Class | IP20 (front panel) | Indoor installation inside control cabinets |
| Operating Temperature | -20℃ ~ +60℃ | Adaptable to wide-range industrial temperature |
| Storage Temperature | -40℃ ~ +85℃ | Safe for transportation and storage |
- Core Differences Between New SSD-C and Traditional Standard SSD
| Comparison Item | EOCR-SSD-C-30DMQ (New C Type) | EOCR-SSD-30DM7Q (Old Standard Type) |
| Outline Size | Ultra-thin compact design, space-saving in cabinet | Conventional wide body, larger space occupation |
| Protection Functions | Overload + Phase Loss + Locked Rotor + Phase Unbalance + Phase Sequence | Only overload, phase loss and locked rotor protection |
| Protection Accuracy | ±3% | ±5% |
| Adjustable Time Delay Range | Wider range: 0.2~30s | Narrow range: 0.5~10s |
| Electromagnetic Interference Resistance | Enhanced EMC filter, applicable for inverter surrounding environments | Ordinary anti-interference performance, easily affected by inverter interference |
| Compatibility | Universal pin definition, seamless replacement for old models | Cannot be reversely replaced by new C-type products |
- Cross-Brand Product Comparison
| Brand & Model | Current Range | Control Power | Display Mode | Core Protection | Application Scenarios |
| Schneider EOCR-SSD-C-30DMQ | 3~30A | 220VAC | Three-phase peak current Q display | Overload / Phase Loss / Locked Rotor / Unbalance / Phase Sequence | Narrow cabinets, heavy-duty motors with three-phase unbalance |
| Schneider EOCR-SSD-30DM7Q | 3~30A | 220VAC | Three-phase average current display | Overload / Phase Loss / Locked Rotor | Conventional working conditions with balanced loads |
| ABB CM-MSS.31P | 3~30A | 24~240V AC/DC | Indicator light without digital display | Overload & Phase Loss | Simple basic protection for general industrial control |
| Siemens 3RB2026-1SB0 | 2.5~32A | Wide universal voltage | Indicator light | Basic overload and phase loss protection | Complete cabinet matching with Siemens PLC |
| Omron K8DS-PH1 | 3~30A | 100~240VAC | Average value digital display | Full-range protection | Precision motors for automatic production lines |
- Full SSD-C Series Model List (Including Q Peak Current Version)
| Current Grade | Basic Model | Optional Power Suffix | Complete Q Peak Current Model |
| 0.5~6A | EOCR-SSD-C-05S | F7:110VAC / M:220VAC / S:24~240V / W:380V | EOCR-SSD-C-05DMQ |
| 3~30A | EOCR-SSD-C-30S | Same as above | EOCR-SSD-C-30DMQ |
| 5~60A | EOCR-SSD-C-60S | Same as above | EOCR-SSD-C-60DMQ |
Order Accessories
DIN rail bracket: EOCR-MNT-01
Test & calibration kit: EOCR-TEST-KIT
Custom signal extension cable: 5m / 10m
- Common Faults & Exclusive Maintenance Solutions (C-Q Series)
| Fault Phenomenon | Main Causes | Troubleshooting & Solutions |
| No display on panel | Disconnected 220V power supply, loose terminals, blown internal fuse | Measure terminal voltage, fasten wiring, replace 0.5A fuse |
| Frequent unbalance alarm & tripping | Three-phase load deviation over 8%, poor line contact, phase loss of power supply | Balance motor load, tighten three-phase wiring, inspect incoming line voltage |
| False tripping & failure to start | Too short D-Time start delay, underset current value | Set delay = motor starting time +1~2s; set current to 1.1 times motor rated current |
| Phase sequence fault alarm | Reversed phase sequence of three-phase incoming lines | Swap any two live wire connections |
| Garbled flickering display | Strong electromagnetic interference from inverter, poor grounding | Standardize grounding layout, keep away from inverter cables, install anti-interference filter |
Maintenance Cycle
Daily inspection: Check peak current value and fault alarm status
Monthly maintenance: Remove dust and tighten wiring terminals
Quarterly calibration: Verify protection action threshold
Annual overhaul: Detect contact service life and replace aging components
- Application Environment Specifications
✅ Recommended Application Scenarios
- Water pumps, fans, conveyors working under three-phase current unbalance conditions
- Compact control cabinets requiring ultra-thin compact protectors
- Heavy-duty motors for chemical stirring, metallurgy, water treatment and HVAC systems
- Industrial sites with strong electromagnetic interference nearby inverters
❌ Not Recommended Scenarios
- High-voltage motors above 690V (special high-voltage protector required)
- Explosion-proof hazardous areas (no original factory explosion-proof enclosure certification)
- Ultra-low power motors below 0.5A
- Long-term independent operation of single-phase motors
- Quick Selection Tips
New ultra-thin C-type SSD, 3 to 30 ampere range;
M stands for 220V AC power, Q shows maximum single-phase current;
Added unbalance and phase sequence protection, easy installation in narrow cabinets;
Set current to 1.1 times rated value, extend start delay by one second extra.
- Air Freight Compliance & Certification Qualifications
- Air Transportation Safety: No built-in lithium batteries or supercapacitors, fully compliant with UN38.3 standards. Shippable as general cargo without special MSDS documents.
- Authoritative Certifications: CE (EU), UL (North America), CCC (China Compulsory Certification), CSA, RoHS environmental protection certifications fully approved.
- Standard Compliance: Strictly implemented in accordance with international standard IEC 60947-4-1 for low-voltage motor protection.
