Indication Contacts

Introduction

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

Indication contacts are under the front face of the circuit breaker. 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.

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: Instantaneous protection Long-time protection Short-time protection Ground-fault protection Earth-leakage protection Operation of the MX or MN voltage releases Operation of the push-to-trip button Connecting/Disconnecting the withdrawable circuit breaker
SDE indication contact	Electrical fault indication: The SDE contact indicates that the circuit breaker has tripped on an electrical fault due to: Instantaneous protection Long-time protection Short-time protection Ground-fault protection Earth-leakage protection
CAO early-break contact	Rotary handle position indication: The CAO early-break contact indicates that the rotary handle started to turn to the open position.
CAF early-make contact	Rotary handle position indication: The CAF early-make contact indicates that the rotary handle started to turn to the closed position.

Operation of the Indication Contacts

The following figures show the position of the indication contacts for each position of the operation handle and main contacts.

Name	Contact number	Position of the operation handle and contacts
Toggle handle position	–
Rotary handle position	–
Device status	–	OFF	ON	Tripped (by MicroLogic trip unit)	Tripped by MN/MX or push-to-trip	Tripped by protection
Main contact position	–	Open	Closed	Open	Open	Open
OF indication contact position	1–2	Closed	Open	Closed	Closed	Closed
OF indication contact position	1–4	Open	Closed	Open	Open	Open
SD indication contact position	1–2	Closed	Closed	Open	Open	Open
SD indication contact position	1–4	Open	Open	Closed	Closed	Closed

SDE indication contact position	1–2	Closed	Closed	Open	Closed	Open
SDE indication contact position	1–4	Open	Open	Closed	Open	Closed

Operation of Early-Break and Early-Make Contacts

A change in position of the direct and extended rotary handles is indicated by the following early-break and early-make contacts:

CAO: early-break contact indicates that the rotary handle started to turn to the open position. It can be used to open the contactor control circuit before the circuit breaker opens.
CAF: early-make contact indicates that the rotary handle started to turn to the closed position. It can be used to supply an MN undervoltage release before the circuit breaker closes.

Name	Contact number	Position of the operation handle and contacts
Rotary handle position	–
Main contact position	–	Open	Open	Closed	Closed	Open
CAO early-break contact	1–2	Open	Closed	Closed	Open	Open
CAO early-break contact	1–4	Closed	Open	Open	Closed	Closed
CAF early-make contact	1–2	Closed	Open	Open	Closed	Closed
CAF early-make contact	1–4	Open	Closed	Closed	Open	Open