Circuit Breaker Internal Attachments

In addition to the AL, AX, and other devices that can be ordinarily attached to a molded case circuit breaker, attachments such as the following are available and can be added to earth leakage circuit breakers with a wide range of optional functions for particular applications.

Earth leakage alarm switch (EAL)

This device outputs an alarm only when earth leakage tripping occurs.

Test button lead wire (TBL)

This device is used to check remotely that the earth leakage circuit breaker is normal.

Test button module (TBM)

This device applies voltage and performs test operation from a remote location.

Meg measurement switch (MG)

This device enables meg measurement in the electrode gap on the load side when the handle is OFF position or trip position.

Operation of internal attachments
in each earth leakage circuit breaker state

ELCB state	SERVICIO IN	OFF	Overcurrent tripping	Earth leakage tripping
AL (a-contact)
AX (a-contact)
EAL (a-contact)