Motor Protection Solution – Schneider Electric EOCR-SSD 05 | EOCRSSD-05DF7
The Schneider Electric EOCR-SSD 05 (Part No. EOCRSSD-05DF7) is a microprocessor-based electronic overcurrent relay engineered for precise, reliable motor protection in demanding industrial environments. Designed to replace traditional thermal overload relays, it delivers accurate trip response, extended motor life, and reduced unplanned downtime across a wide range of applications.
Where This Product Is Used
The EOCR-SSD 05 is specified by engineers and system integrators across the following industries and applications:
- Pump Stations & Water Treatment: Protects submersible and centrifugal pump motors from overload, phase loss, and locked-rotor conditions in municipal and industrial water systems.
- HVAC & Building Automation: Guards compressor and fan motors in air-handling units, chillers, and cooling towers against thermal damage.
- Conveyor & Material Handling: Monitors belt conveyor drive motors in logistics centers, mining operations, and manufacturing lines.
- Compressor Systems: Provides overload and phase-failure protection for reciprocating and screw compressors in oil & gas and process industries.
- Machine Tool & CNC Equipment: Safeguards spindle and servo-adjacent motors in precision machining environments.
- Food & Beverage Processing: Suitable for mixer, agitator, and conveyor motor protection in hygienic production facilities.
- Chemical & Petrochemical Plants: Deployed in motor control centers (MCCs) for agitator, pump, and blower motor protection.
Technical Specifications
- Model / Part Number: EOCR-SSD 05 / EOCRSSD-05DF7
- Manufacturer: Schneider Electric (formerly Samwha / EOCR brand)
- Type: Electronic Overcurrent Relay (Microprocessor-based)
- Series: EOCR-SSD
- Setting Current Range: 0.5 – 5 A (adjustable)
- Trip Class: Class 10 / Class 20 selectable
- Supply Voltage: 100–240 V AC / 50–60 Hz
- Output: 1 SPDT relay output (NO + NC)
- Protection Functions: Overload, Phase Loss, Phase Unbalance, Locked Rotor, Ground Fault (model dependent)
- Reset Mode: Manual / Auto selectable
- Mounting: DIN rail or panel mount
- Operating Temperature: -10°C to +55°C
- Weight: 255 g
- Enclosure Rating: IP20
- Certifications: CE, UL, cUL
Why Engineers Specify This Model
- Microprocessor Precision: Eliminates the thermal drift inherent in bimetallic relays — trip accuracy is maintained across ambient temperature variations.
- Multi-Function Protection: Single device covers overload, phase loss, and unbalance — reducing panel component count and wiring complexity.
- Selectable Trip Class: Class 10 for standard motors; Class 20 for high-inertia loads such as compressors and fans — no additional hardware required.
- Auto/Manual Reset Flexibility: Auto-reset suits remote or unattended installations; manual reset ensures operator acknowledgment before restart in safety-critical processes.
- Compact DIN Rail Form Factor: Fits standard 35 mm DIN rail, compatible with existing MCC and control panel layouts.
- Proven Schneider Electric Reliability: Backed by global service network, long-term spare parts availability, and IEC/UL dual certification.
Complete System Bill of Materials
For a complete motor protection and control circuit, engineers typically pair the EOCRSSD-05DF7 with:
- Schneider Electric TeSys D or TeSys K Contactor (LC1D / LC1K series)
- Schneider Electric GV2 or GV3 Motor Circuit Breaker (manual motor starter)
- 24 V DC or 230 V AC Control Power Supply
- Schneider Electric Harmony XB4 / XB5 Push Buttons (Start / Stop / Reset)
- Schneider Electric Harmony XB4 Pilot Lights (Run / Fault indication)
- Terminal Blocks: Phoenix Contact or Weidmüller DIN rail type
- 24 V DC PLC Input Module for remote fault monitoring (optional)
Compliance & Industry Standards
- IEC 60947-4-1: Low-voltage switchgear and controlgear — electromechanical contactors and motor starters
- IEC 60947-5-1: Control circuit devices and switching elements
- UL 508: Industrial Control Equipment (USA)
- CE Marking: Compliant with EU Low Voltage Directive (LVD) and EMC Directive
- RoHS Compliant: Restriction of Hazardous Substances
Quality Assurance & Sourcing
Konmask.com sources the EOCRSSD-05DF7 exclusively through verified Schneider Electric authorized distributors and certified industrial surplus channels. Every unit undergoes incoming inspection including:
- Visual inspection for label authenticity and housing integrity
- Date code and batch traceability verification
- Functional continuity check prior to dispatch
- Anti-static packaging with humidity indicator card
Counterfeit components are a known risk in the industrial relay market. Our sourcing protocol is designed to protect your installation and your liability.
How to Source This Part
- In Stock: Add to cart and proceed to checkout — ships within 1–3 business days from our warehouse.
- Bulk / Project Quantity: Contact us for volume pricing and lead time on quantities of 10+ units.
- Urgent Requirement: Email support@konmask.com or call +0086 19859288691 for expedited sourcing.
- Datasheet / Wiring Diagram: Available upon request — include your project voltage and motor FLA in your inquiry for a pre-configured recommendation.
Application-Specific FAQ
Q: Can the EOCR-SSD 05 protect a 3-phase motor directly without a CT?
A: Yes — for currents within the 0.5–5 A setting range, the motor leads pass directly through the relay’s built-in current sensing window. External CTs are not required.
Q: What is the difference between EOCR-SSD and EOCR-SS?
A: The SSD series adds a digital display for real-time current readout and enhanced diagnostics, making it easier to commission and troubleshoot compared to the analog-adjust SS series.
Q: Is this relay compatible with variable frequency drives (VFDs)?
A: The EOCR-SSD 05 can be used on the output side of a VFD for motor protection; however, consult the application note for derating guidelines at low carrier frequencies.
Q: What happens on a phase-loss event?
A: The relay detects current imbalance exceeding the threshold and trips within the programmed delay time, opening the output relay contact and de-energizing the contactor coil.
Q: Can I integrate the fault output into a PLC?
A: Yes — the SPDT output contact (rated 5 A / 250 V AC) can be wired directly to a PLC digital input for remote fault monitoring and alarm annunciation.
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Contact: support@konmask.com | +0086 19859288691
