Forums » Electrical Engineering

instantaneous overcurrent relay

    • 17 posts
    October 4, 2019 9:28 PM PDT


    I have a question, what is the purpose of instantaneous overcurrent relay functionality, can it help to decrease the incidents.

    • 156 posts
    October 4, 2019 10:47 PM PDT

    instantaneous means no time delay and this relay will trip the breaker without intentional time delay. This way  it can reduce the incidents and arc time.

    This post was edited by Zone4 Engineer at October 4, 2019 10:48 PM PDT
    • 103 posts
    October 5, 2019 11:26 AM PDT

    ANSI Device number 50, instantaneous overcurrent relay or rate of rise relay. It is a protective device that operates instantaneously on an excessive value of current or an excessive rate of current rise, with no time delay except what is imposed by the mechanical operation.

    It can help limit damage.