What Are the Common Circuit Protection Devices?

Circuit Protection Devices are essential protective devices in circuit devices. With their protection, many power problems such as voltage and current overload, short circuit, leakage, etc. can be greatly reduced. So what are the common circuit protection devices? Let's take a look!

1. Overload protector

The overload protector can effectively prevent electrical appliances from being damaged due to excessive load. When the current exceeds the rated value, it will quickly cut off the circuit. Common overload protectors include thermal and electromagnetic types. Surge protector: Discharges transient high voltage (such as lightning) for electronic equipment protection.

2. Leakage protector

The leakage protector is mainly used to detect and respond to circuit or equipment leakage. Once the current leakage is detected, it will immediately cut off the circuit to prevent electric shock accidents. The protector is mainly of two types: electromagnetic and electronic.

3. Short-circuit protector

The short-circuit protector is a key device of Circuit Protection Devices. When a short circuit occurs in the circuit, it can quickly cut off the power supply to avoid dangerous situations such as fire.

4. Grounding protector

The grounding protector is responsible for detecting grounding faults in the circuit. When a grounding problem occurs, it will cut off the circuit in time to ensure safety. Grounding protectors are mainly divided into three types: timeout circuit breakers, overvoltage protectors and differential protectors.

5. ‌Relay type protection device‌

‌Thermal relay‌: Utilizes the thermal bending characteristics of bimetallic strips for motor overload protection.

‌Overcurrent relay‌: Based on electromagnetic induction, adjusts the action threshold and is suitable for power systems.

‌Phase loss protector‌: Monitors the phase loss of three-phase power supply to protect motor equipment.

6‌.Other common devices‌:

‌Contactor‌: Used for pressure protection (such as manual restart after power outage).

‌Phase sequence protector‌: Prevents equipment failure caused by three-phase phase sequence errors.

In addition, there are other types of Circuit Protection Devices, such as overvoltage protectors, undervoltage protectors, capacitor protectors and brake protectors, each of which has specific application scenarios and functions. In industrial circuits, the rational selection of various types of protectors is of vital importance to ensure the safety of life and property and reduce the probability of safety accidents.