Reclosers

Reclosers – What They Are and How They Work

What Is a Recloser?

A recloser—sometimes called an electrical recloser—is an automatic circuit breaker installed on overhead utility distribution lines. Unlike standard breakers, reclosers can detect electrical faults and automatically restore power without manual intervention.

This ability makes reclosers a critical part of modern power distribution systems, especially in reducing outages and maintaining grid reliability.

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

How Do Reclosers Operate?

Reclosers follow a simple but effective cycle:

  1. Fault detected → the breaker opens to stop electricity flow.

  2. Pause & test → after a short delay, the recloser tries to close the circuit again.

  3. If the fault clears (e.g., a tree branch briefly touched the line), power is restored.

  4. If the fault persists, the recloser will retry up to 4 times before locking open.

This sequence prevents unnecessary outages while ensuring that permanent faults get flagged for repair.

Types of Reclosers

  • Single-phase hydraulic reclosers – commonly used in rural lines.

  • Three-phase hydraulic reclosers – protect larger feeders in city grids.

  • Vacuum/electronic reclosers – modern, smart-grid ready options.

  • Advanced smart reclosers – with SCADA integration, automation, and analytics.

Including 3-phase hydraulic reclosers and electronic reclosers in your network can significantly improve fault detection and response.

Key Components of a Recloser

  • Interrupter → breaks the circuit (vacuum bottle or SF6 gas chamber).

  • Control Unit → manages fault detection and reclosing logic.

  • Sensors → measure current, voltage, and load conditions.

  • Actuator → opens and closes the breaker.

  • Communication Interface → connects to smart grid or SCADA systems.

Where Are Reclosers Used?

  • Utility & City Power Grids – Protect overhead feeders, restore power after faults, and coordinate with fuses.

  • Rural & Remote Networks – Manage long-distance lines, reduce outages, and minimize truck rolls.

  • Special Applications – Integration with renewables (solar, wind, storage) and smart grid automation.

Buying Used or Reconditioned Reclosers

When purchasing a used recloser, check:

  • Fault history & operation count

  • Maintenance & testing records

  • Control compatibility (DNP3, IEC 61850, etc.)

  • Correct voltage rating (15kV, 27kV, or 38kV)

  • Single-phase vs. 3-phase recloser fit for your system

Factory-reconditioned reclosers with warranties typically provide the best value for long-term use.

Recloser Pricing Guide

  • Single-phase hydraulic recloser: $5,000–$12,000

  • Three-phase hydraulic recloser: $12,000–$25,000

  • Vacuum/electronic recloser: $8,000–$40,000

  • Smart reclosers: $30,000–$80,000+

  • Installation costs: $10,000–$25,000

Used or reconditioned units can cost 25–75% less depending on condition and upgrades.

Final Buying Tips

  • Run electrical tests (timing, insulation, resistance).

  • Inspect interrupters and actuators.

  • Prioritize units with firmware updates & smart features.

  • Ensure spare parts and service support are available.