Product Overview

The Woodward 8440-1849 is an MFR 15 generator protection relay designed for generator-set electrical protection and monitoring applications. Available product references identify this part number with the MFR1515B configuration, making it part of Woodward’s MFR family of generator protection devices.

The relay is intended to monitor generator electrical conditions and initiate protective actions when configured limits are exceeded. Typical generator protection functions can include voltage, frequency, phase, and related electrical fault monitoring, depending on the exact MFR configuration and programmed options. It is therefore suited to diesel-generator, standby-power, and industrial generating-set applications where reliable protection is required. Because the complete type code contains configuration information, the installed settings and firmware should be checked before replacement.

Publicly available sources identify 8440-1849 as an MFR1515B generator protection relay, but detailed electrical ratings for the complete configuration are not sufficiently documented in the available sources.

Key Features and Benefits — 8440-1849

• MFR 15 generator protection architecture
• Designed for generator-set applications
• Electrical parameter monitoring
• Configurable protection functions
• Suitable for industrial power-generation systems
• Appropriate for legacy Woodward control installations
• Supports generator protection and supervisory functions
• Useful as an MRO replacement for installed systems

The exact protection scheme depends on the configured MFR variant. For a replacement, matching the complete type designation is more important than selecting a relay based only on its external dimensions.

Related Models

Woodward MFR 15: Generator protection relay family for monitoring and protecting generator electrical systems.

Woodward 8440-1846: MFR31S15B configuration used for generator-control applications.

Woodward 8440-1854: AMG generator controller configuration used for genset control applications.

Woodward 8440-1936: easYgen-3500-5/P2 controller identified as a modern alternative for some legacy generator-control applications, although compatibility must be evaluated at the system level.

Installation and Maintenance — 8440-1849

Before replacement, document the existing protection settings, CT and VT wiring, auxiliary supply, relay outputs, communication connections, and generator protection scheme. Preserve the original configuration whenever possible.

Verify all current-transformer and voltage-transformer connections carefully. Incorrect CT polarity or VT wiring can cause incorrect protection measurements and unwanted trips. After installation, perform functional checks for measurement accuracy, alarm outputs, trip outputs, and configured protection thresholds.

Personally, I would compare the complete MFR configuration before commissioning the replacement. A protection relay should never be treated as a simple plug-in substitute when its programmed protection parameters affect generator shutdown behavior.

Product Warranty — 8440-1849

Warranty coverage depends on supplier, equipment condition, and purchase agreement. For new-old-stock, surplus, or refurbished inventory, confirm the exact MFR configuration, hardware revision, serial number, functional-test results, programming status, and warranty period before purchase.

The Woodward 8440-1849 is best specified as an exact MFR1515B configuration. Available replacement references show that some legacy Woodward generator protection products have modern alternatives, but direct substitution should only be made after checking the complete protection and control architecture.