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How to protect appliances in case of a power failure?

Small habit changes, combined with suitable devices and network maintenance, can protect appliances from fluctuations.

By CASACOR Publisher

Submitted at Dec 15, 2025, 10:40 AM

05 min de leitura
Imóvel alugado ganha cozinha dos sonhos para confeiteira profissional

Imóvel alugado ganha cozinha dos sonhos para confeiteira profissional (Rafael Renzo/CASACOR)

The lack of electricity has been a recurring phenomenon in different regions of the country, associated with climatic events, network overload and/or distribution failures. Even when it occurs for a short period, this interruption usually generates direct impacts on the operation of domestic equipment.

Power outage at home

(CASACOR)

With the advancement of automation and the intensive use of electronic devices in homes, it becomes increasingly important to learn how to protect the appliances in these situations. The adoption of preventive measures helps to avoid losses, extends equipment durability, and contributes to a safer relationship with the urban electrical infrastructure.

Damage from lack of power to appliances


The main damages caused by power outages do not occur only during the blackout, but mainly at the moment when the supply is restored. The return of electricity is usually accompanied by voltage spikes and fluctuations that can affect sensitive internal components, such as electronic boards, motors, and sensors.

Light colors, wood, and plenty of natural lighting define a 800 m² house. Project by Livia Quintella. In the picture, kitchen with mirrored cabinetry.

Projeto de Livia Quintella. (Pedro Mello/CASACOR)

More modern appliances, which rely on digital systems, tend to be more vulnerable to these variations. Refrigerators, washing machines, televisions, microwaves, and internet-connected devices may suffer progressive wear and tear, which is not always immediately noticeable but compromises performance over time.

7 tips to protect appliances in case of power outage


Protecting equipment involves a combination of daily habits and attention to the electrical system of the residence. The following guidelines help reduce the risks associated with drops and fluctuations in electricity supply.

Unplugging devices during the interruption

Removing appliances from the outlet during the power outage reduces exposure to voltage spikes that occur when electricity returns, considered the most critical moment for the equipment.

Using surge-protected power strips

Certified power strips help absorb electrical variations and act as a additional barrier to protect connected appliances, especially televisions, computers, and small devices.

Power strip at the outlet

(Freepik/CASACOR)

Waiting before plugging in devices again

Waiting a few minutes after power restoration helps avoid initial overloads of the network, protecting motors and electronic boards from immediate impacts.

Specific care with refrigerators and freezers

During power outages, keeping the doors closed preserves the internal temperature and reduces the compressor's effort when electricity returns, aiding in the preservation of refrigerators and freezers.

Open refrigerator

(Freepik/CASACOR)

Attention to the electrical installation of the property

Proper grounding, correctly sized circuit breakers, and wiring in good condition are essential factors for continuously protecting appliances, especially in older properties.

Avoid overloads on outlets and extensions

The excessive use of adapters, power strips, and extensions compromises the distribution of electrical current and increases the risk of damage to equipment during power fluctuations.

Consider using UPS for sensitive equipment

Computers, routers, security systems, and home automation benefit from the use of UPS, which ensure stable power for a short period and prevent abrupt shutdowns.

benjamin overloaded; electrical; outlet

(Master House/CASACOR)

CASACOR Publisher is an exclusive content creation agent, developed by the Technology team of CASACOR from the knowledge base of casacor.com.br. This text was edited by Yeska Coelho.