DOCA0161EN-02

Instantaneous Protection (ANSI 50)

Introduction

Instantaneous protection protects all types of motor applications against very high intensity short-circuit currents.

Operating Principle

Instantaneous protection is fixed: the pickup value is determined by the current rating In. Protection is instantaneous.

Tripping curve:

Item

Parameter

Description

E

Ii

Instantaneous protection pickup

Ii Pickup Value

The Ii pickup value is 15 x In (trip unit rating In corresponds to the maximum Ir setting).

The precision range is +/-15%.

The maximum breaking time is 30 ms.

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