To Next PageTo Next PageWhy can't I open the cubicle door on my Siemens UL 489?
If the cubicle door cannot be opened (with a door interlock accessory) for Siemens Circuit breakers, it could be due to: * A closed circuit breaker preventing the door from opening: Open the circuit breaker. * The circuit breaker being in the connected position: Rack the circuit breaker into the test or disconnected position.
Why won't my Siemens UL 489 Circuit breakers close and the ready-to-close indicator is off?
If a Siemens circuit breaker won't close and the ready-to-close indicator is not lit, it could be due to several reasons: * The closing spring may not be charged: Charge the closing spring. * The undervoltage release might not be energized: Energize the undervoltage release. * The electrical closing interlock may be active: Switch off the control voltage for interlocking. * A key lock might be engaged: Unlock it. * Padlocks might be installed: Remove them. * The EMERGENCY OPEN button might be engaged: Release it by rotating. * A lockout might be active because the cubicle door is open: Close the cubicle door. * The electronic trip unit might be missing or incorrectly installed: Install it properly. * The shunt trip might be energized: De-energize it.
What to do if Siemens UL 489 Circuit breakers won't close but the ready-to-close indicator is on?
If the ready-to-close indicator is on, but the Siemens circuit breaker still won't close, the issue might be: * The closing coil is not energized or is incorrectly energized: Check or apply the correct voltage. * The secondary disconnects have been removed: Plug in the secondary disconnects.
How to fix a racking handle that cannot be drawn out on Siemens UL 489 Circuit breakers?
If the racking handle cannot be drawn out on Siemens Circuit breakers, it might be because: * The circuit breaker is closed: Press the "OPEN" button and pull the racking handle block out. * The cubicle door is not completely closed (if a locking device is installed as an accessory): Close the cubicle door.
What causes a racking handle to not push in on Siemens UL 489 Circuit breakers?
If the racking handle cannot be pushed in on Siemens Circuit breakers, it is likely interlocked. Rack the circuit breaker into the disconnected, test, or connected position, unlatch the crank, and push it fully in.
Why can't I fit my Siemens Circuit breakers in the guide rails?
If a Siemens circuit breaker cannot be fitted in the guide rails, the factory-mounted coding of the circuit breaker and cradle may not match. This means the circuit breaker is not rated for use in this cradle. Replace it with the proper circuit breaker; permissible circuit breakers are listed on the cradle type label.
Why doesn't my Siemens UL 489 Circuit breakers move during the first rotations when racking to test position?
When racking Siemens Circuit breakers from the disconnected into the test position, if the circuit breaker does not move during the first 6 rotations (approximately), this is not a fault but a functional property. Continue racking.
General| Brand | Siemens |
|---|---|
| Model | UL 489 |
| Category | Circuit breakers |
| Language | English |
Identifies and describes the main components of the circuit breaker, including handles, indicators, and trip units.
Details the components of the cradle and optional accessories, such as shutters and interlocking mechanisms.
Explains the accessory label on the circuit breaker frame, detailing terminal designations for various functions.
Describes the circuit breaker frame type label, including UL mark, current, voltage, frequency, and interrupting rating.
Details the frame designation system and trip unit designation for identifying circuit breaker types and configurations.
Explains the rating plug and cradle type labels, including catalog numbers and applicable ratings.
Outlines standard specifications for circuit breakers and cradles, and qualifications for qualified personnel.
Provides instructions for unpacking circuit breakers and cradles, and lists their respective weights.
Details safe procedures for lifting circuit breakers and cradles using cranes or lifting bar assemblies.
Specifies mounting requirements, including position, tolerances, cubicle dimensions, and ventilation.
Details main terminal connections for draw-out and fixed-mount breakers, including cradle and front connections.
Covers secondary wiring, breaker and cradle secondary disconnect blocks, and terminal blocks.
Outlines preparation steps for draw-out breakers, including position indicators and racking handle operations.
Details the procedure for manually charging the closing spring of the circuit breaker.
Provides a checklist for commissioning, and procedures for closing, opening, and tripping the circuit breaker.
Offers solutions for common disturbances and possible causes related to circuit breaker operation.
Provides dimension drawings for fixed-mounted circuit breakers of Frame Size I.
Presents dimension drawings for fixed-mounted and draw-out circuit breakers of Frame Size II.
Details dimension drawings for fixed-mounted and draw-out circuit breakers of Frame Size III.
Shows door cutout dimensions for draw-out circuit breakers of Frame Size I, II, and III.
Details terminal assignments for various internal and external connections of the trip unit.
Explains terminal and wire assignments for auxiliary switches and signaling switches.
Provides circuit diagrams for shunt trip, undervoltage trip, and closing coil functions.
Compares functions of ETU745 and ETU776 trip units, including basic and advanced protective features.
Details the ETU745 trip unit overview, controls, indicators, and overcurrent protection settings.
Provides an overview of the ETU776 trip unit, covering its controls, indicators, and overcurrent protection settings.
Describes the various indicators and displays on the trip units, explaining their meanings and functions.
Details overload, short-time delayed, instantaneous, neutral conductor, and ground fault protection functions.
Covers load monitoring, leading signal for L-tripping, phase loss sensing, and thermal memory functions.
Explains switchable characteristics for short-time delayed and ground-fault protection.
Describes the alphanumeric display, its overview, field installation, and modifying display angle.
Outlines the menu structure of ETU745, showing navigation between modes using buttons.
Demonstrates displaying measured values, characteristics, and setting protection parameters.
Explains how to identify trip units and reset measured minimum/maximum values.
Details the rating plug's role in defining rated current and lists associated catalog numbers.
Describes ground-fault protection modules, their combinations, and catalog numbers.
Provides step-by-step instructions for removing and replacing the trip unit, including safety warnings.
Explains how to perform an internal self-test for the overcurrent tripping function.
Illustrates the system architecture of CubicleBUS modules, their connections, and components.
Details the function and signaling switches for the Breaker Status Sensor (BSS) module.
Provides general information on COM modules, their communication capabilities (PROFINET, Modbus), and IT security.
Details the procedure for fitting COM modules onto the guide frame.
Provides instructions for fitting COM modules onto fixed-mounted circuit breakers.
Explains the function, installation, and connection of digital input and output modules.
Details the external sensor for neutral conductors, including components and terminal assignments.
Provides information on connecting an external 24 V DC voltage supply and its requirements.
Describes the handheld test device, its view, and necessary preparations before testing.
Guides on testing current sensors, energy transducers, and tripping functions (L, S, I, N, G).
Details procedures for resetting the Bell Alarm, including automatic, manual, and remote methods.
Provides instructions for field installing a reclosing lockout mechanism.
Details the installation of the remote Bell Alarm reset coil and cut-off switch.
Provides an overview of shunt trips, closing coils, and undervoltage release, including mounting locations.
Details the procedure for installing shunt trips, closing coils, and undervoltage devices.
Guides on setting delay times for instantaneous and time-delayed undervoltage releases.
Details electrical function tests for closing coil and undervoltage release.
Provides instructions for installing internal auxiliary switches S1-S4 and their wiring connections.
Details the snap-in mounting procedure for the 'Ready-to-close' switch S20.
Describes the installation of specific trip signaling switches and their wiring connections.
Introduces Mechanism Operated Contacts (MOC) and describes their available versions for draw-out breakers.
Provides installation instructions for MOC devices, including coupler and baseplate assembly.
Details how to remove, install, and wire contact blocks within the MOC assembly.
Provides instructions for installing the motor operator, including safety precautions.
Describes the installation and connection of an optional motor disconnect switch on the front panel.
Explains how to limit access to the OPEN and CLOSE buttons using an accessory kit.
Details the installation of an EMERGENCY STOP mushroom pushbutton.
Explains the function and installation of the mechanical operations counter.
Introduces key lock types and their applications for securing circuit breakers and cradles.
Outlines various padlock locking devices for securing the circuit breaker in different states.
Details the CLOSE/OPEN padlock kit that prevents manual operation of the buttons.
Describes the mechanical interlocking module and its prerequisites for proper function and configurations.
Details interlocking configurations for two sources, three sources, and feeder breakers.
Provides instructions for installing the interlocking module, including intermediate shaft and Bowden cables.
Describes phase barriers, their usable materials, mounting holes, and guide slots.
Introduces arc chute covers and provides instructions for their field installation.
Defines the qualifications required for personnel performing maintenance on the equipment.
Details steps for opening the breaker, discharging the spring, and removing it from the cradle.
Recommends inspection of arc chutes and checking for contact erosion using indicators.
Details the procedure for exchanging primary disconnects, including finger clusters and stab tips.
Provides general notes for testing, personnel qualifications, and proper handling of circuit breakers.
Explains phase current testing for breakers with and without ground fault protection.
Details ground fault current testing for 3-wire and 4-wire residual systems and direct sensing.
Lists UL489 ratings for WL frame sizes 1 and 2, including interrupting current and enclosure dimensions.
Provides UL489 ratings for WL frame size 3 and compares ratings across frame sizes 1, 2, and 3.
Lists ratings for manual and motor-operated mechanisms, auxiliary releases, and MOC contacts.
Provides a comprehensive list of abbreviations used throughout the document.
Defines key terms and concepts related to circuit breakers, trip units, and accessories.
