What is Auto Reclosing?

What is Auto Recloser, and How Does It Work?

An auto recloser is a high-voltage electric switch that closes automatically. It shuts off electric power when there is a problem, such as a short circuit, just like circuit breakers on domestic electric lines. A recloser automatically examines the electrical cable to determine whether it has removed the problem or not, unlike an automatic circuit breaker, which remains turned off until manually reset. If the issue were just momentary, the recloser would automatically reset and restore electric power.

From the substation to the residential utility poles, users use reclosers throughout the power distribution system. They range in size from modest reclosers for single-phase power lines to massive three-phase reclosers.

Why would you want to utilize Auto Reclosing?

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Electric utilities worldwide acknowledge automatic circuit reclosers as a critical technology for achieving their primary goal: delivering maximum continuity of electric supply to its consumers simply and cost-effectively. Reclosers detect and interrupt fault currents, restoring service automatically after a brief outage. The automatic circuit recloser is essentially a self-contained device with the intelligence to see overcurrents, time and interrupt fault currents, and re-energize the line by automatically shutting the circuit. If a failure is permanent, the recloser locks open after a predetermined number of operations (typically three or four), isolating the defective segment from the rest of the system.

Reclosers save the electric companies a lot of time and money since they allow power to be restored automatically after just a few flickers. Reclosers reduce the outage area and assist crews in swiftly locating the problem and restoring power during outages that need a repair crew. Electric power users – residential, commercial, industrial, and institutional – are spared the cost and inconvenience of frequent power outages.

Manufacturers would not have brought many critical process power-use devices, such as computers, pumps, and assembly lines, into existence without this high level of power stability.

What is the function of Auto Reclosing?

When the recloser detects a problem, it automatically turns off the electricity. The recloser puts the power back on a moment later (the duration may be as little as a lightbulb flicker), but if the problem persists, it switches it off again. If the problem persists after three attempts, the recloser is set to consider it a permanent problem and turns off. A power company team must first fix the line fault and then reset the recloser to restore electricity.

Lightning strikes, falling tree branches, or automobile wrecks destroying power lines or other equipment are examples of long-term issues.

Types of Auto Reclosing

1. Single-phase recloser:

A user uses single-phase reclosers to protect single-phase lines in a three-phase feeder, such as branches or taps. They can employ it on three-phase circuits with a majority of single-phase loads. When a persistent phase-to-ground fault occurs, one phase can be locked out while the remaining two-thirds of the system remains operational.

Single-phase reclosers are often mounted directly to the pole or substation steel structure by the built-in mounting hanger bracket, which removes the need for an extra mounting frame due to their lesser weight than bigger three-phase reclosers.

2. Auto Reclosers with three phases:

Three-phase reclosers are used on three-phase circuits to increase system dependability and to avoid single phasing of three-phase loads such as big three-phase motors, where lockout of all three phases is necessary for any permanent malfunction. The recloser is chosen depending on the needed electrical ratings, the interrupting and insulating medium, and whether a user uses hydraulic or electronic control.

The following is the manner of operation:

Larger reclosers employ this mode, which includes three-phase trip and three-phase lockout. For each trip operation, all contacts open simultaneously for any fault (single-phase-to-ground, phase-to-phase, or three-phase). The exact mechanism controls the three phases, which a user connects mechanically for tripping and reclosing.

A user can mount three-phase reclosers in various ways, including pole mounting frames and substation frames.

1. Triple phase Auto Recloser

Electronically controlled triple-single reclosers have three modes of operation.

2. Three-phase trip and lockout

All three phases trip on an overcurrent simultaneously, reclose, and sequence together.

3. Single-phase trip and three-phase lockout

For overcurrent tripping and reclosing, each phase acts individually. The other two phases trip open and lockout if any phase sequences to lockout state (due to a persistent defect) or if “lockout” is asserted locally or remotely. The energization of three-phase loads with a single-phase for an extended period is avoided.

Single-phase trip and single-phase lockout: Each phase travels and locks out independently of the others. That is mainly for domestic loads and when overcurrent prevents single-phasing of three-phase loads in some way.

When using a pole mount or a substation frame, Triple-single reclosers can be positioned on a pole or in the substation (or directly to a steel substation structure).

Available Product

GRD9L – R + GYL9 2P RCCB + Auto Recloser

4 GRD9L R 2PGYL9 MCB Auto Reclosing

You might find the GRD9L-R+GYL9 2P RCCB + Auto Recloser in various electrical grid terminal lines. That includes meter boxes, new energy circuit management, PV solar control boxes. Also, it comes with intelligent electricity, smart electricity homes, new energy car charging piles, and more.

Description of the Auto Reclosing product:

  • You can pair it with a residual current circuit breaker/leakage protection switch. It will automatically reclose when the MCB / Auto Recloser RCCB trips unexpectedly, eliminating the need for manual closing and lowering the cost of manual maintenance. It can also remove problems in real-time, increasing efficiency.
  • Three reclosing times are built-in, and a persistent closing failure within 15 minutes can trigger an alert through an auxiliary contact.
  • A switch that allows you to choose between manual and automated operation.
  • Double locking mechanism (mechanical/electronic).
  • The shaft transmission mode is more stable and dependable than the chain transmission style.
  • You can combine it with additional accessories.
  • LEDs show whether or not the device is in use.
  • 1-Module Controller With Rs485 Interfaces.

GRD9L-R+GYM9 4P MCB Auto Recloser 

4 GRD9L R M9 4PGYM9 MCB Auto Recloser

You might find the GRD9L-R+GYM9 4P MCB Auto Recloser in meter boxes, new energy circuit management, PV solar control boxes, smart electricity, intelligent homes, and new energy car charging piles, among other places.


There is some vital information that you must know about auto reclosers. When you are buying a product, make sure that you go through this brief guide. From the types of recloser to its operation, ensure that you have all the details handy before buying the product.

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