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Trip Units

Trip Units

The Electronic Trip Unit is a microprocessor controlled multifunction overcurrent protective device for application with Siemens state-of-the-art family of SB Encased Systems Breakers. The adjustment flexibility provided by the trip unit allows the user to easily accommodate load changes and other protective requirements while still assuring optimum coordination. In addition to the adjustable protection functions, the trip unit is designed to use field interchangeable rating plugs. These rating plugs allow the ampere rating of the breaker to be changed to meet specific applications. For ease of installation and interchangeability in the field, the trip unit has been designed as a plug-in unit to mount directly into a SB breaker frame. Current sensors within the SB breakers provide signal currents and operating power for the trip unit. Therefore, when the breaker is closed, the trip unit requires no external connections or control power to perform its protection functions.

Overcurrent Protection Configurations Trip units are available in six basic overcurrent protection configurations to meet specific protection requirements. All trip units have Adjustable Continuous Current and Long Time Delay. Optional protection configurations are: Protection Configuration Identifier Long Time/Short Time (LS) Long Time/Instantaneous (LI) Long Time/Short Time/Instantaneous (LSI) Long Time/Short Time/Ground Fault (LSG) Long Time/Instantaneous/Ground Fault (LIG) Long Time/Short Time/Instantaneous/ Ground Fault (LSIG) As standard features, the trip unit has two built-in-test functions and a fault identification function. System Check is a built-in-test function that continuously checks the status of the microprocessor and protective algorithms. A green LED on the front panel blinks approximately every 3 seconds when the microprocessor is properly cycling through its protection routines. Integral Test is a built-in-test that allows the user to exercise the trip unit electronics. LED indicators display the testing status. Trip Status is a fault identification function that stores information when a fault current causes the trip unit to trip the circuit breaker. By pressing the Query button the user can display the cause of the breaker trip by illuminating one of four LED’s: OL (overload), ST (short time), SC (short circuit), or GF (ground fault).

 

PDF Trip Unit Manuals:

Electronic Trip Unit for SB Encase System Breakers

Installing SensiTrip and SB Electronic Trip Units in Zone Selective Interlocken

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