LR20025 Multifunction Protection Relay (Industrial-Grade Power Safeguard)

The LR20025 represents Woodward's MFR13 series commitment to intelligent generator protection—a configurable relay platform engineered to detect electrical anomalies, isolate faults, and maintain power continuity across industrial, marine, and renewable energy installations. Designed for system integrators and facility engineers who demand precision monitoring without complexity, this relay consolidates six protection functions into a single DIN-rail package, reducing panel footprint while enhancing diagnostic visibility.

Built to withstand temperature extremes (-20°C to +60°C) and voltage fluctuations (85-265 VAC/DC), the LR20025 serves as the first line of defense against overvoltage events, frequency deviations, and phase imbalances that threaten generator longevity. Its sub-50-millisecond response time ensures equipment shutdown occurs before thermal damage or mechanical stress accumulates, translating to lower maintenance costs and extended asset life.

Whether you're protecting a standby diesel genset in a hospital, monitoring grid-tie parameters for a solar farm, or coordinating load-sharing in a marine propulsion system, the LR20025 delivers field-proven reliability backed by CE/UL certifications and Woodward's global support infrastructure. Configurable setpoints, LED status indicators, and Modbus RTU integration enable seamless SCADA connectivity for remote diagnostics and predictive maintenance workflows.

Core Protection Functions & Operational Benefits

✓ Six-in-One Protection Architecture: Consolidates overvoltage, undervoltage, overfrequency, underfrequency, phase sequence, and phase loss detection—eliminating the need for multiple single-function relays and simplifying wiring complexity.

✓ Rapid Fault Isolation (<50ms): Microsecond-level sampling detects transient events before they cascade into equipment failure, protecting alternators, switchgear, and downstream loads from voltage spikes or frequency drift.

✓ Universal Input Compatibility (85-265 VAC/DC): Operates across global voltage standards without external transformers, reducing BOM costs and installation time for multi-site deployments.

✓ Modbus RTU Connectivity: Integrates with existing SCADA platforms, PLCs, and HMI systems for real-time alarm forwarding, historical trending, and remote setpoint adjustments—critical for unmanned facilities.

✓ Configurable Alarm Outputs: Programmable relay contacts enable custom escalation logic (e.g., warning vs. trip thresholds), allowing operators to balance protection sensitivity with nuisance trip avoidance.

✓ Compact DIN-Rail Form Factor: Occupies 25% less panel space than legacy relay assemblies, freeing room for additional I/O modules or future expansion in retrofit projects.

Typical Application Scenarios

→ Emergency Standby Generators (Healthcare/Data Centers): Hospitals and colocation facilities rely on the LR20025 to monitor utility-to-generator transfer sequences, ensuring backup power activates within NFPA 110 time limits while preventing backfeed conditions that could endanger utility workers.

→ Renewable Energy Grid Interconnection: Solar inverters and wind turbines use the relay to verify grid voltage/frequency compliance before synchronization, avoiding anti-islanding violations and utility disconnect penalties per IEEE 1547 standards.

→ Industrial Cogeneration Systems: Manufacturing plants with combined heat and power (CHP) systems deploy the LR20025 to coordinate generator paralleling, load sharing, and reverse power protection—maximizing fuel efficiency while maintaining power quality.

→ Marine Propulsion & Auxiliary Power: Offshore vessels and cruise ships utilize the relay's vibration-resistant design to protect ship service generators from voltage sags during heavy motor starts or dynamic positioning maneuvers.

→ Mining & Remote Site Power: Off-grid mining operations leverage the relay's wide temperature range and dust-resistant enclosure to safeguard diesel gensets in harsh environments where service access is limited.

Technical Parameters & Selection Guide

Selection Criteria: Choose the LR20025 when your application requires multi-parameter protection in a single device, especially for retrofit projects where panel space is constrained. For applications needing advanced metering (kW, kVAR, power factor), consider pairing with Woodward's EASYGEN controllers. For motor-specific protection, evaluate the MRD series relays with thermal overload modeling.

Extended Integration Capabilities

SCADA & IoT Connectivity: The relay's Modbus RTU interface supports polling rates up to 19.2 kbps, enabling integration with Wonderware, Ignition, or custom Python-based monitoring dashboards. Register mapping documentation simplifies commissioning for OT/IT convergence projects.

Coordinated Protection Schemes: When deployed alongside Woodward governor controls (e.g., DSLC, ProAct), the LR20025 can trigger load shedding sequences or initiate black-start procedures based on programmable logic—ideal for microgrids and islanded power systems.

Customization Options: Factory configuration services available for high-volume orders requiring pre-programmed setpoints, custom firmware, or private-label branding. Contact our engineering team for OEM partnership inquiries.

Delivery Timeline & Service Assurance

Standard Lead Time: 3-5 business days for in-stock units (North America/Europe); 7-10 days for Asia-Pacific shipments. Expedited 24-hour dispatch available for critical outage scenarios.

Custom Configuration: Pre-programmed relays ship within 10-14 business days, including factory testing and calibration certificates traceable to NIST standards.

Warranty Coverage: 12-month manufacturer warranty covering defects in materials and workmanship. Extended 36-month coverage available through our ProCare service plan.

Technical Support: Lifetime access to Woodward's global support network, including 24/7 emergency hotline, firmware updates, and replacement part availability guaranteed for 15+ years post-purchase.

Documentation Package: Each relay includes installation manual, Modbus register map, AutoCAD panel cutout drawings, and sample ladder logic for common PLC platforms (Allen-Bradley, Siemens, Schneider).

Frequently Asked Questions

How does the LR20025 interface with existing generator control panels?
The relay's universal 85-265 VAC/DC input eliminates the need for external power supplies, while its compact DIN-rail footprint allows side-by-side mounting with existing contactors and circuit breakers. Modbus RTU wiring requires only two twisted-pair conductors (RS-485 A/B), simplifying retrofit installations without major panel redesigns.

Can this relay monitor three-phase systems or only single-phase generators?
The LR20025 monitors single-phase voltage and frequency parameters. For three-phase applications requiring phase rotation and imbalance detection, consider the Woodward MCDGV4 series, which offers per-phase monitoring with neutral current sensing.

What is the typical power consumption of the relay during normal operation?
The device draws less than 5 watts at rated voltage, making it suitable for battery-backed UPS systems or solar-powered remote sites where auxiliary power budgets are constrained.

Does the relay require periodic calibration or maintenance?
No field calibration is required. The relay uses solid-state sensing with factory-calibrated accuracy of ±1% across its operating range. Annual functional testing (simulated fault injection) is recommended per NFPA 110 guidelines for emergency power systems.

Is firmware upgradeable for future feature enhancements?
Yes, firmware updates are distributed via Woodward's service portal and can be uploaded through the Modbus interface using the provided configuration software (Windows-based). Updates typically add protocol enhancements or regional compliance features.

What happens if communication to the SCADA system is lost?
The relay operates autonomously—all protection functions remain active even if Modbus communication fails. Local LED indicators continue to display fault status, and hardwired relay outputs trigger per programmed logic, ensuring fail-safe operation.

Secure Your Power Infrastructure Today

Protect your critical power assets with proven Woodward engineering. Contact our technical sales team for application-specific sizing, panel layout assistance, or volume pricing for multi-site deployments. Request a detailed datasheet, CAD models, or arrange a live demonstration of the LR20025's configuration interface.

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? Technical inquiries: sale@ninermas.com
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