Indication Contacts

Characteristics of Indication Contacts

Use indication contacts to view the status of the circuit breaker remotely.

Indication contacts are located under the front face of the circuit breaker, in a compartment that is isolated from the power circuits. When an indication contact is present, a green flag is displayed on the front of the circuit breaker.

The contacts used for indication contacts are common point changeover contacts.

C(1) Common

NC(2) Normally closed contact. The NC contact is normally closed when the circuit breaker is in the O (OFF) position.

NO(4) Normally open contact. The NO contact is normally open when the circuit breaker is in the O (OFF) position.

NOTE: The indication contact provides either OF or SD indication functions, depending on its location in the circuit breaker.

Name	Definition
OF open / close indication contact	The OF contact indicates the state of the circuit breaker, (I (ON) or O (OFF)/Trip). Changeover O (OFF) to I (ON) I (ON) to O (OFF) I (ON) to Trip
SD trip indication contact	The SD contact indicates that the circuit breaker has tripped due to: Operation of the push-to-trip button Operation of the MX shunt trip or MN undervoltage release Electrical fault detected by the protection Changeover I (ON) to Trip Trip to O (OFF)

Name

Definition

OF open / close indication contact

The OF contact indicates the state of the circuit breaker, (I (ON) or O (OFF)/Trip).

Changeover

O (OFF) to I (ON)
I (ON) to O (OFF)
I (ON) to Trip

SD trip indication contact

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

Operation of the push-to-trip button
Operation of the MX shunt trip or MN undervoltage release
Electrical fault detected by the protection

Changeover

I (ON) to Trip
Trip to O (OFF)

Operation of the Indication Contacts

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

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