Introduction

Surge Protective Devices (SPDs) are vital components that shield electrical systems from damaging voltage surges. However, SPDs do not last indefinitely; their performance can degrade over time due to repeated surge events and environmental factors. Proper maintenance and timely replacement are crucial to ensure ongoing protection. This article covers everything you need to know about SPD maintenance and lifespan.

Understanding the Lifespan of SPDs

The lifespan of an SPD largely depends on the number and severity of surges it absorbs, as well as environmental conditions such as temperature and humidity. Typically, SPDs last between 3 to 10 years. After absorbing multiple surges, especially high-energy lightning strikes, the internal components like Metal Oxide Varistors (MOVs) may degrade, reducing effectiveness.

Signs That Your SPD Needs Maintenance or Replacement

• Indicator Lights: Many SPDs have visual indicators showing operational status. A red or unlit indicator often signals a fault or end-of-life condition.
• Frequent Equipment Failures: If connected equipment is experiencing unexplained failures, the SPD may no longer provide adequate protection.
• Physical Damage: Visible damage, corrosion, or discoloration on the SPD enclosure warrants immediate inspection.
• Age: SPDs older than the manufacturer’s recommended service life should be tested and likely replaced.

Maintenance Tips for SPDs

• Regular Inspections: Schedule periodic visual checks for indicator status and physical condition.
• Electrical Testing: Use specialized testing equipment to verify SPD functionality.
• Record Keeping: Maintain logs of surge events and maintenance activities to anticipate replacement needs.
• Environment Control: Protect SPDs from excessive heat, moisture, and corrosive environments to extend life.

When to Replace Your SPD

Replacement should occur when an SPD no longer meets protection criteria, indicated by failed tests, visual indicators, or after a significant surge event. Proactive replacement prevents unexpected equipment damage and downtime.

Conclusion

Maintaining your Surge Protective Devices is essential to ensuring continuous and reliable protection of your electrical systems. Regular inspection, timely testing, and replacement when necessary will safeguard your equipment against surge damage and prolong system life. Make SPD maintenance an integral part of your electrical safety program.