Frequently asked questions
What is the function of an SDX switch?
FA175423
23 January 2021
Issue:
What is the function of the SDX relay module for Powerpact H J and L circuit breakers?
Product Line:
Circuit Breakers
Environment:
Powerpact H, J, and L circuit breakers with advanced Micrologic trip units
Resolution:
Circuit breakers equipped with Micrologic 3, 5, and 6 trip units can take the optional SDx Module.
The SDx Module receives data from the trip unit through a fiber optic link.
Default alarms are as follows
• Micrologic 5 trip unit:
— Output 1 is the thermal fault indication (SDT).
— Output 2 is the long-time pre-alarm (PAL Ir).
• Micrologic 6 trip unit:
— Output 1 is the thermal fault indication (SDT) for electrical distribution applications.
— Output 1 is None for motor-feeder applications.
— Output 2 is the ground-fault indication (SDG).
• For Micrologic 3 trip units, the SDx is nonconfigurable and indicates thermal trip alarm
• For Micrologic 5 and 6, SDx can be configured for different alarms.
Note that the SDX can be used for ground fault alarm on non configurable 6 (LSIG) trip units, but it will not provide ground fault alarm on a Micrologic 5 (LSI) trip unit. Therfore, GF alarm without tripping is not possible.
All alarms on a trip, failure, and maintenance event and all alarms associated with a measurement previously activated in the Alarms tab can be assigned to an SDx Module output.
For complete list, refer to Alarms section of manual 48940-312-01.
To set alarms, access the SDx Module output settings using the RSU software under the Output tab.