Indication Contacts

Introduction

One indicator contact model provides OF, SD, and SDE indication functions. The position of the contact inside the case determines the function.

Indication contacts are either under the front face of the circuit breaker, under the motor mechanism, or in the rotary handle. Installation is in a compartment isolated from the power circuits. There are two types:

Standard contact with spring terminals
Low-level contact with screw terminals

For more information about installation, consult the instruction sheet on the Schneider Electric website: NNZ4314501 Indication Contacts

Standard and Low-Level Contacts

Standard and low-level contacts are the common point changeover type.

NC Normally Closed contact

NO Normally Open contact

The following table describes the operation of standard and low-level volt-free contacts:

Name	Definition
OF indication contact	Changeover: The NO contact is normally open when the circuit breaker is in the O (OFF) position.
SD indication contact	Trip indication: The SD contact indicates that the circuit breaker has tripped due to: Electrical fault detected by the trip unit Operation of the MX or MN voltage releases Operation of the push-to-trip button Connecting/Disconnecting the withdrawable circuit breaker Manually opening the motor mechanism
SDE indication contact	Electrical fault indication: The SDE contact indicates that the circuit breaker has tripped on an electrical fault due to an electrical fault detected by the trip unit.

Name

Definition

OF indication contact

Changeover: The NO contact is normally open when the circuit breaker is in the O (OFF) position.

SD indication contact

Trip indication: The SD contact indicates that the circuit breaker has tripped due to:

Electrical fault detected by the trip unit
Operation of the MX or MN voltage releases
Operation of the push-to-trip button
Connecting/Disconnecting the withdrawable circuit breaker
Manually opening the motor mechanism

SDE indication contact

Electrical fault indication: The SDE contact indicates that the circuit breaker has tripped on an electrical fault due to an electrical fault detected by the trip unit.