Schneider Electric EOCR-SSD 05 EOCRSSD-05DF7

Product Details

EOCR-SSD 05 EOCRSSD-05DF7 Product Description

The Schneider Electric EOCR-SSD-05S is a precision-engineered electronic overload relay purpose-built for integration within EOCR-series motor protection and control architectures. Designed to deliver reliable motor current monitoring, phase-loss detection, and trip-signal coordination across multi-tier industrial control systems, the EOCR-SSD-05S serves as a critical protection layer between the power distribution level and the motor drive execution layer. Its compact DIN-rail form factor and standardized signal interface make it a natural fit for panel builders, system integrators, and OEM automation designers who demand consistent, repeatable protection performance across large-scale motor control centers (MCCs), distributed control panels, and process automation cabinets.

In modern industrial control architectures, motor protection is not a standalone function — it is a coordinated system responsibility. The EOCR-SSD-05S is engineered to fulfill that responsibility by providing accurate overload trip thresholds, adjustable current settings, and clean relay output signals that interface directly with PLCs, safety relays, and contactor control circuits. Whether deployed in a simple DOL (Direct-On-Line) starter configuration or embedded within a star-delta, soft-starter, or VFD bypass architecture, the EOCR-SSD-05S maintains signal integrity and protection continuity across the full motor lifecycle.

The EOCR-SSD-05S achieves its full value when deployed as part of a coordinated automation platform rather than as an isolated protection device. In a typical Schneider Electric EOCR-based motor control architecture, the EOCR-SSD-05S operates at the protection layer, receiving current signals from CT (current transformer) inputs and issuing trip commands to the contactor control circuit. This protection signal is simultaneously fed to the PLC digital input module — such as a Schneider TM3DI16 or TM2DI16 I/O expansion module — enabling the controller to log fault events, trigger alarm outputs, and initiate automatic restart sequences based on programmed logic.

At the power distribution layer, the EOCR-SSD-05S works in coordination with Schneider Electric iC60N or iC60H miniature circuit breakers (MCBs) and GV2ME manual motor starters to provide upstream short-circuit protection while the EOCR handles downstream thermal and electronic overload protection. This layered protection philosophy ensures that fault energy is contained at the appropriate level without nuisance tripping or cascading failures across the MCC bus.

For communication-intensive architectures, the EOCR-SSD-05S relay output can be wired to a Schneider Electric XPSAF or XPSMF safety relay module, enabling integration into SIL-rated safety loops for emergency stop (E-Stop) and safe-state management. In distributed I/O architectures using Schneider TM3 or Advantys STB island modules, the trip signal from the EOCR-SSD-05S can be mapped to a remote I/O node, allowing centralized SCADA or DCS systems to monitor motor protection status across geographically distributed plant areas.

At the HMI layer, Schneider Electric Magelis HMIGTO or HMISTO operator panels can display real-time motor status, overload trip history, and current measurement data sourced from the EOCR-SSD-05S via the PLC. This visibility reduces mean time to repair (MTTR) by enabling maintenance technicians to diagnose motor faults from the HMI without physically inspecting the control panel. When paired with a Schneider Electric Modicon M221 or M241 PLC, the EOCR-SSD-05S trip data can be logged to internal memory or transmitted via Modbus TCP/IP to a supervisory system for trend analysis and predictive maintenance scheduling.

In redundant motor control architectures — common in water treatment, oil and gas, and power generation applications — the EOCR-SSD-05S can be deployed in parallel with a secondary EOCR-SSD or EOCR-DS unit on a standby motor circuit. The dual-relay output configuration allows the control system to automatically switch to the standby motor upon detection of an overload condition on the primary circuit, maintaining process continuity without operator intervention. This redundancy design is further supported by Schneider Electric TeSys D or TeSys K contactors, which provide the switching capacity required for seamless motor changeover in high-availability process lines.

Manufacturing & Assembly Lines: In automotive, electronics, and consumer goods manufacturing, the EOCR-SSD-05S protects conveyor motors, pump drives, and compressor units within multi-motor MCC panels. Its adjustable current setting and selectable trip class allow engineers to fine-tune protection thresholds for motors with varying load profiles and starting characteristics, reducing unplanned downtime and extending motor service life across high-cycle production environments.

Power Generation & Utilities: In power plant auxiliary systems — including cooling water pumps, fuel oil transfer pumps, and forced draft fan motors — the EOCR-SSD-05S provides reliable overload protection with phase-loss detection capability. Phase-loss protection is particularly critical in utility applications where single-phasing can cause rapid motor winding damage and unplanned generation outages. The EOCR-SSD-05S detects phase imbalance conditions within seconds and issues a trip command before thermal damage occurs.

Petrochemical & Process Industries: In refineries, chemical plants, and LNG terminals, the EOCR-SSD-05S is deployed in hazardous-area motor control panels where motor protection reliability directly impacts process safety. Its compact form factor allows installation in space-constrained Ex-rated enclosures, and its universal supply voltage input simplifies panel design across multi-voltage plant electrical systems. Integration with Schneider Electric Preventa safety relays ensures that motor trip signals are correctly processed within the plant's functional safety architecture.

Water & Wastewater Treatment: Municipal water treatment facilities rely on the EOCR-SSD-05S to protect submersible pump motors, aeration blower motors, and sludge mixer drives operating in continuous-duty, high-humidity environments. The auto-reset function allows remote restart of non-critical motors after a thermal overload condition clears, reducing the need for manual intervention at remote pump stations and lowering operational labor costs.

Mining & Metallurgy: In underground mining and surface ore processing, the EOCR-SSD-05S protects high-inertia conveyor belt motors, crusher drives, and ventilation fan motors subject to frequent heavy-load starting cycles. Its locked-rotor protection function detects stalled motor conditions — common in crusher jam events — and trips the circuit before motor winding temperatures reach damaging levels, preventing costly motor rewinds and extended production shutdowns.

Q1: Is the EOCR-SSD-05S compatible with Schneider Electric TeSys D contactors and Modicon PLC digital input modules? Yes. The EOCR-SSD-05S relay output (1 NO + 1 NC) is fully compatible with Schneider Electric TeSys D and TeSys K contactor coil control circuits. The trip relay output can be wired in series with the contactor coil circuit for direct trip control, or connected to a Modicon M221/M241 PLC digital input module (24VDC) for software-managed fault handling. No additional signal conditioning is required for standard 24VDC PLC input interfaces.

Q2: Can the EOCR-SSD-05S be used in a star-delta or soft-starter motor starting architecture? Yes. The EOCR-SSD-05S is suitable for use in star-delta, soft-starter, and VFD bypass motor starting configurations. In star-delta applications, the EOCR-SSD-05S should be installed on the line-side of the motor circuit to monitor full-load current during both star and delta running modes. For soft-starter applications, the EOCR-SSD-05S provides backup overload protection independent of the soft-starter's internal thermal model, ensuring protection continuity in the event of soft-starter bypass or internal fault conditions.

Q3: What warranty and supply assurance does NANKMOS provide for the EOCR-SSD-05S? NANKMOS provides a 12-Month Warranty on all EOCR-SSD-05S units, covering manufacturing defects and functional failures under normal operating conditions. Each unit undergoes pre-shipment functional testing including relay output verification, current setting calibration check, and trip function validation before dispatch. NANKMOS maintains dedicated stock of EOCR-SSD series components to support urgent project timelines and MRO (Maintenance, Repair & Operations) replenishment requirements. For volume orders, lead time and availability confirmation is provided within 24 hours of inquiry.