LELB1-37211-20-V

Circuit breakers are safety devices that help prevent overvoltage and short-circuits. They can be used to protect not just the electrical system, but also other high-value equipment from damage and disruption. The LELB1-37211-20-V circuit breaker is a type of circuit breaker specifically designed for industrial applications.

Application Field

The LELB1-37211-20-V circuit breaker is designed for use in industrial applications where protection for both medium and high voltage circuits is required. This circuit breaker can be used in a wide range of electrical applications, from drive controllers to transformer networks, from pumps to motors. It can also be used in high-energy applications such as medium and low voltage motor starters and transformer feeds.

Working Principle

At the heart of the LELB1-37211-20-V circuit breaker lies its integral thermal-magnetic trip mechanism, which responds to electrical faults or excessive current. The thermal-magnetic trip mechanism works by monitoring the current continuously. When the current exceeds the arc current, a thermal overload protection device is activated, causing the breaker switch to safely trip.

If the triangle-shaped trip curve is followed, the trip occurs at a fixed time. This makes the thermal-magnetic trip mechanism particularly suitable for applications where a specific time is required to stop the current. The LELB1-37211-20-V can be set at different current levels for different applications, so the arc current can be adjusted according to the application.

Safety Features

LELB1-37211-20-V circuit breakers are designed with safety in mind. They feature automatic reactivation, which prevents the breaker from tripping again after a fault has been identified and removed.

Additionally, they are equipped with a manual reset function, allowing a technician to reset the breaker switch after a fault has been identified and repaired. This helps to reduce downtime and avoid costly repairs. It also provides added peace of mind, as technicians can manually reset the breaker to ensure that all components are safely powered-on again.