Reclosers

What Are Reclosers and How Do They Work?

Reclosers are automatic circuit breakers used on overhead utility lines. They detect electrical faults and restore power without manual intervention. These devices play a key role in maintaining power reliability in distribution systems.

This short video offers a clear introduction to how reclosers work and why they’re important in modern power systems.

How Do Reclosers Operate?

  • Detects a fault: The breaker opens to stop electricity flow.
  • Waits a few seconds: Then it tries to close the circuit again.
  • If the problem is gone: Power is restored automatically.
  • If the problem remains: It retries up to 4 times before locking open.

This cycle helps avoid unnecessary outages from short-lived issues like momentary contact with tree branches.

Key Components of a Recloser

  • Interrupter: Breaks the circuit using vacuum or gas.
  • Control Unit: Manages fault detection and reclosing logic.
  • Sensors: Monitor current and voltage.
  • Actuator: Opens and closes the breaker.
  • Communication Interface: Enables remote monitoring and control.

Where Are Reclosers Used?

Utility and City Power Grids

  • Protecting overhead power feeders
  • Automatically restoring power after minor faults
  • Coordinating with fuses and smart grid systems

Rural and Remote Networks

  • Managing long-distance power lines
  • Reducing crew dispatch for temporary outages
  • Improving power reliability in hard-to-reach locations

Special Use Cases

  • Integrating solar, wind, or battery storage
  • Smart grid and self-healing grid setups
  • Automation for looped systems

Buying Used Reclosers: What to Look For

Check the Recloser’s Condition

  • Number of past fault operations
  • Maintenance and test history
  • Condition of interrupters, bushings, and insulation
  • Hydraulic fluid status (if applicable)
  • Firmware updates (for digital controls)

Ensure Electrical Compatibility

  • Correct voltage rating (15kV, 27kV, or 38kV)
  • Proper current and interrupt ratings
  • BIL rating for surge protection
  • Control voltage match
  • SCADA communication compatibility (e.g., DNP3, IEC 61850)

Application Fit

  • Single-phase or three-phase?
  • Local or remote control needs?
  • Mounting requirements?
  • Smart features for automation?

How Much Do Reclosers Cost?

New Reclosers (Typical Price Ranges)

  • Single-phase hydraulic: $5,000–$12,000
  • Three-phase hydraulic: $12,000–$25,000
  • Single-phase vacuum/electronic: $8,000–$15,000
  • Three-phase vacuum/electronic: $18,000–$40,000
  • Advanced smart reclosers: $30,000–$80,000
  • Installation: $10,000–$25,000

Used or Reconditioned Units

  • As-is condition: 25–45% of new
  • Field reconditioned: 40–60% of new
  • Factory reconditioned (with warranty): 50–75% of new
  • Additional testing: $1,000–$5,000
  • Control upgrades: $5,000–$15,000

What Affects the Price?

  • Age: Newer = more expensive
  • Number of operations: Fewer is better
  • Manufacturer: Premium brands retain value
  • Technology: Vacuum and electronic types are more valuable
  • Smart features: Add cost but improve performance
  • Compatibility: Important for modern systems

Final Buying Tips

  • Run key tests (timing, insulation, resistance, control checks)
  • Hydraulic units: inspect actuator and fluid quality
  • Vacuum units: test interrupter vacuum integrity
  • Factory-reconditioned units with warranty offer best value
  • Make sure parts and service are still available

Choosing the right recloser ensures safer, more reliable, and cost-effective power distribution—especially when integrating with modern automation systems.