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EOCRSSD-30DF7 is a digital motor protector manufactured by Schneider Electric (formerly Samwha, Südkorea) with current range 3-30A and 110VAC control power supply. It provides triple protection against overload, phase loss and locked rotor. It is applicable for precise protection of three-phase low-power motors, capable of replacing traditional thermal relays to improve protection accuracy and fault diagnosis efficiency.
- Model Code Definition
| Codesegment | Beschreibung |
| EOCR | Electronic Over Current Relay, core product positioning |
| SSD | Solid State Digital, adopting solid-state electronic components and digital control technology |
| 30 | Current protection range: 3~30A (direkte Verbindung, no external CT required) |
| D | Digitalanzeige, equipped with digital tube to display real-time 3-phase average current and fault status |
| F7 | Control power specification: 110VAC±15% (50/60Hz); other options: M7(220VAC), B(24VAC/DC) |
- Main Technical Specifications
| Kategorie | Parameter | Bemerkungen |
| Grundlegende Informationen | ||
| Marke | Schneider Electric (Former Samwha Korea) | Produced in Iksan, Korea; Authorized agent in China: Shanghai Hanshi Electric |
| Produkttyp | Digital Overcurrent Relay / Motor Protector | Höhere Präzision (±5 %) than traditional thermal relay |
| Elektrische Parameter | ||
| Nennbetriebsspannung | 600V und (UL) / 690V und (CSA, IEC 60947-4-1) | Suitable for low-voltage motor circuits |
| Bewertete Stoßspannungsfestigkeit | 6kV | Konform mit IEC 60947-4-1 |
| Kontrollmacht | 110VAC±15%, 50/60Hz | Matched with F7 code |
| Stromverbrauch | ≤3W | Low power consumption for long-term operation |
| Schutzparameter | ||
| Einstellbarer Strombereich | 3~30A continuously adjustable | Adjustment ratio: 10:1 |
| Schutzfunktionen | 1. Überstrom (O-Time: 0.5~10s adjustable) | Independent adjustable start delay D-Time |
| 2. Phase loss (fast protection within 3s) | ||
| 3. Locked rotor (combined D-Time+O-Time protection) | ||
| Reset-Modus | Handbuch / Elektrisch (optional) | Reset required after fault for restart |
| Ausgabe & Anzeige | ||
| Ausgangskontakt | 1 NC + 1 NEIN (2-SPST) | Kontaktbewertung: 3A/250VAC |
| Display Mode | Digital tube display | Real-time 3-phase average current, flashing fault code indication |
| Körperlich & Umweltfreundlich | ||
| Dimension | 45×75×110mm, standard DIN rail mounting | Compact size saves cabinet space |
| Schutzgrad | IP20 (Frontplatte) | Suitable for installation inside control cabinets |
| Betriebstemperatur | -20℃ ~ +60℃ | Adaptable to industrial temperature variation |
| Lagertemperatur | -40℃ ~ +85℃ | Meet transportation and storage requirements |
| Zertifizierung | ||
| Internationale Zertifizierungen | CE, UL, CSA | Comply with IEC 60947-4-1, global applicable |
| Luftfracht-Compliance | Keine eingebaute Lithiumbatterie, conform to UN38.3 | Shippable as general cargo without special packaging |
- Markenübergreifender Vergleich
| Modell | Aktueller Bereich | Kontrollmacht | Anzeige | Schutz | Preisklasse | Anwendung |
| Schneider EOCRSSD-30DF7 | 3~30A | 110VAC | Digitale Anzeige | Überlast / Phase loss / Locked rotor | 350~450CNY | 3-phase low-power motors with fault diagnosis demand |
| ABB CM-MSS.31P | 3~30A | 24~240VAC/DC | Kontrollleuchte | Überlast / Phase loss / Locked rotor | 400~500CNY | Allgemeine Industriemotoren, unified brand matching |
| Siemens 3RB2026-1SB0 | 2.5~32A | 24~240VAC/DC | Kontrollleuchte | Überlast / Phase loss | 300~400CNY | Supporting Siemens PLC, Grundschutz |
| Omron K8DS-PH1 | 3~30A | 100~240VAC | Digitale Anzeige | Überlast / Phase loss / Locked rotor | 380~480CNY | Automatisierte Produktionslinien, high-precision protection |
| Chint NR2-32 | 2.5~32A | No control power | Keine Anzeige | Überlast / Phase loss | 50~80CNY | Economy application, low precision requirement |
Wichtige Auswahlpunkte
- Display function: EOCRSSD-30DF7 supports real-time current monitoring and fault diagnosis, superior to indicator-light-only models
- Protection accuracy: Electronic protector (±5 %) far exceeds thermal relay (±15 %), extending motor service life
- Control power: 110VAC F7 version fits specific regional power grids, confirm on-site power supply first
- Vollständige Modellliste der Serie
EOCR-SSD Series Classification
| Aktueller Bereich | Basismodell | Power Options | Vollständige Modellbeispiele |
| 0.5~6A | EOCRSSD-05S | S:24~240VAC/DC | EOCRSSD-05DF7, EOCRSSD-05DM7, EOCRSSD-05DB |
| F7:110VAC | |||
| M7:220VAC | |||
| W:380~440VAC | |||
| 3~30A | EOCRSSD-30S | Das Gleiche wie oben | EOCRSSD-30DF7, EOCRSSD-30DM7, EOCRSSD-30DW |
| 5~60A | EOCRSSD-60S | Das Gleiche wie oben | EOCRSSD-60DF7, EOCRSSD-60DM7, EOCRSSD-60DS |
Bestellcode & Zubehör
Standardbestellnummer: EOCRSSD-30DF7
Mounting bracket: EOCR-MNT-01 (DIN rail type)
Extension cable: EOCR-CAB-05 (5M) / EOCR-CAB-10 (10M)
Test kit: EOCR-TEST-KIT (including analog load & calibrator)
- Häufige Fehler & Maintenance Solutions
| Fehlerphänomen | Mögliche Ursachen | Schritte zur Fehlerbehebung | Lösungen | Vorbeugende Maßnahmen |
| Keine digitale Anzeige | 1. Control power disconnected | 1. Klemmenspannung messen | 1. Connect 110VAC correctly | Check power spec before installation |
| 2. Wrong wiring polarity | 2. Verkabelung prüfen | 2. Adjust connection (AC non-polar) | ||
| 3. Internal fuse blown | 3. Inspect internal fuse | 3. Replace 0.5A fuse | ||
| Fehlauslösung | 1. Low current setting | 1. Confirm motor rated current | 1. Set current to 1.1 times rated value | Set parameters per motor nameplate |
| 2. Short start delay | 2. Extend D-Time | 2. D-Time = motor start time +1s | ||
| 3. Power harmonic interference | 3. Test power THD | 3. Install power filter | ||
| Failure to trip | 1. Excessively high current setting | 1. Check current setting | 1. Set current to 0.9 times rated value | Regular contact inspection, Überlastung vermeiden |
| 2. Beschädigte Ausgangskontakte | 2. Test contact continuity | 2. Replace contact module | ||
| 3. Internal circuit failure | 3. Inspect internal components | 3. Contact after-sales service | ||
| Garbled display | 1. Spannungsschwankung | 1. Test power stability | 1. Install voltage stabilizer | Keep away from inverters, ensure good grounding |
| 2. Elektromagnetische Störungen | 2. Check grounding | 2. Optimize grounding | ||
| 3. Program error | 3. Power cycle restart | 3. Restore factory settings |
Wartungszyklus
- Daily inspection: Check display status and alarm indicator
- Monthly maintenance: Dust cleaning, tighten wiring terminals
- Quarterly calibration: Verify protection parameter accuracy
- Annual overhaul: Inspect internal components, replace aging parts
- Anwendungsszenarien & Cases
Anwendbare Szenarien
Industrielle Automatisierung: CNC-Werkzeugmaschinen, Förderer, Druckgeräte
Water treatment: Wasserpumpen, fans with frequent startup and variable load
HVAC: Air compressors, cooling tower fans
Building materials industry: Mixer, heavy-duty conveyors
Power system: Standby generators, small transformer protection
Non-recommended Scenarios
High voltage motors (>690V): Adopt dedicated high-voltage protectors
Explosion-proof environment: Extra explosion-proof housing required with higher cost
Ultra-low current (<0.5A): Choose EOCRSSD-05S or match external CT
Typische Fälle
Fall 1: Water Pump Motor Protection in Steel Plant
Problem: Frequent false tripping of old thermal relays causing unplanned shutdowns without fault identification
Lösung: Install EOCRSSD-30DF7, set current 15A (motor rated 13.5A), start delay 5s
Wirkung: False shutdown rate reduced by 62%, fault diagnosis time shortened from 2h to 5min, annual maintenance cost saved about 80,000 CNY
Fall 2: Mixer System in Pharmaceutical Factory
Problem: Motor burnout caused by mixer locked rotor leading to heavy losses
Lösung: Adopt EOCRSSD-30DF7, set locked rotor protection (D-Time=3s, O-Time=1s)
Wirkung: Power cut within 3s once locked rotor occurs, 100% motor intact rate, avoid production stop losses
- Auswahlregeln
Schnellauswahlregeln
- Aktuelle Übereinstimmung: Set protection current within 0.9~1.1 times motor rated current
- Delay setting: Start delay (D-Time) = actual motor startup time + 1 zweite
- Stromversorgung: Prioritize matching on-site control power to avoid extra transformer cost
- Display demand: Choose D-type for fault diagnosis, non-D-type for basic protection only
- Luftfracht-Compliance & Zertifizierungen
- Air Freight Regulation
No built-in lithium batteries or supercapacitors, fully compliant with UN38.3 air transport standards
Can be delivered as general goods, no MSDS or special shipping documents needed
Packaging suggestion: Anti-static bag + hard carton to prevent vibration damage
- Qualification Certificates
CE: Comply with EU LVD & EMV-Richtlinien
UL: Meet US safety standards for North America market
CSA: Certified for Canadian market
IEC: Conform to international electrical standards for global use
