Electronic Trip Unit for SB Encased Systems Breakers Information and Instruction Guide
DANGER Hazardous voltage. WIll cuase death of serious injury. Turn off and lock out all power supplying the device prior to cover(s) removal or while cover(s) are removed and when installing any internal or external accessory. Replace the cover(s) and shield(s) before power supplying this device is turned on. Circuit breaker indicators shown in this booklet are for illustration purposes only. Circuit breakers are to be installed in “Discharged” and “Open” positions only.
Electronic Trip Unit for Siemens Type SB Systems Breakers Table of Contents Information and Instructions Electronic Trip Unit Overcurrent Protection Configurations RMS Current Sensing Systems Breaker Frame Sizes Systems Breaker Frame Ampere Ratings Rating Plugs Principles of Operation Functional Diagram 2-5 2 2 3 3 3 3 4 5 Installation Instructions Installing the Trip Unit Removing the Trip Unit Removing/Replacing Plexiglass Cover Inserting/Removing the Rating Plug 6-11 6-8 9 10-11 10-11 Operations Ele
Description Electronic Trip Units For Siemens SB Encased Systems Breakers Electronic Trip Unit 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.
Description Frame Sizes and Ampere Ratings, Rating Plugs, and Interrupting Ratings Frame Sizes and Frame Ampere Ratings Siemens SB Encased Systems Breakers come in six frame sizes with frame ampere ratings ranging from 400 to 5000 amperes. All frames are rated for 100% continuous operation. The max ampere rating is determined by the current transformers within the frame. Correctly rated electronic trip units are available for all SB systems breakers.
Principles of Operation The Siemens Electronic Trip Unit utilizes a microprocessor to execute the myriad of numeric and logic functions programmed in the unit. The adjustments on the trip unit face allow the user to select the numerical values to be used by the microprocessor in performing its protection function. (The numerical values are stored in the processor’s permanent memory.) Current data is derived from current sensors mounted in the Siemens SB Systems Breaker.
Principles of Operation – Functional Diagram 5
Installation Instructions DANGER Electronic Trip Unit Installed into Circuit Breaker Steps 1 through 9. Hazardous Voltage. Will cause death or serious injury. Turn off and lock out all power supplying the device prior to cover(s) removal or while cover(s) are removed and when installing any internal or external accessory. Replace the cover(s) and shield(s) before power supplying this device is turned on.
Installation Instructions 3. Set ground fault selection switch. 5. Check alignment of “rejection-scheme” pins with holes. On trip units with ground fault protection, the ground fault selection switch on the side of the trip unit must be set to the appropriate sensing scheme—Residual or Source Ground/Zero Sequence—prior to installing the trip unit. These ground fault sensing schemes are discussed on page 18.
Installation Instructions 7. Lower trip unit onto support plate. 8. Secure trip unit. After the connector has been mated, lower (push) the trip unit onto the support plate. The pins on the support plate will fit into the holes in the bottom of the trip unit. Secure the trip unit in place with the retaining screw located at the top of the trip unit. Torque 6 and 8 in-lbs. If trip unit top is not secured correctly, the interlock will prohibit closing of the breaker. 9. Replace the front cover.
Removal Instructions DANGER Hazardous Voltage. Will cause death or serious injury. Turn off and lock out all power supplying the device prior to cover(s) removal or while cover(s) are removed and when installing any internal or external accessory. To remove the trip unit the front cover of the breaker must first be removed.
Rating Plug Installation – Insertion and Removal DANGER Hazardous Voltage. Will cause death or serious injury. Turn off and lock out all power supplying the device prior to cover(s) removal or while cover(s) are removed and when installing any internal or external accessory. Replace the cover(s) and shield(s) before power supplying this device is turned on. 1. Check label on the rating plug.
Rating Plug Installation – Insertion and Removal After the rating plug has been inserted and the necessary setting adjustments have been made (see Fault Protection Adjustments, pages 13-18), replace the cover by sliding the protective cover into the top lip of the trip unit, bow slightly in middle, and press down with thumb on bottom to snap cover into place. Replace the two (2) special retaining screws. 4. Squeeze plug clips to insert or remove from trip unit.
Operations – Functions and Adjustments DANGER Hazardous Voltage. Will cause death or serious injury. Turn off and lock out all power supplying the device prior to cover(s) removal or while cover(s) are removed and when installing any internal or external accessory. Replace the cover(s) and shield(s) before power supplying this device is turned on.
Operations – Fault Protection Adjustments Trip Unit Current Shaping Adjustments (This curve is for illustration purposes only) Amperes in Multiples of Rating Plug Value (In) 0.1 1 10,000 (1) Continuous Ampere Setting Region The allowable continuous operating amperes is set to a percent of the rating plug value. Note that the maximum continuous ampere is set by the rating plug value, In.
Operations – Long Time Fault Protection Adjustable Continuous Amps and Adjustable Long Time Delay Ir =%In 70 Continuous 75 65 85 50 SIEMENS Rating Plug 80 60 ln = 2000A 90 100 8 14 17 4 2.5 21 30 SYSTEM CHECK 95 10 5.5 25 Adjustable Long Time Delay The Long Time Pickup is nominally set at 115% of the continuous amps setting. The Long Time Delay adjustment is used to set the tripping delay of the SB breaker based on the magnitude of the overcurrent condition.
Operations – Short Time Fault Protection Adjustable Short Time Pickup and Adjustable Short Time Delay Adjustable Short Time Delay The Short Time Delay adjustment is used to set the time interval the breaker will wait before responding to the current value selected on the Short Time Pickup adjustment. There are two modes of operation of this adjustment on all Siemens Electronic Trip Units; one is a fixed delay, the other is an inverse I2t ramp delay.
Operations – Instantaneous Fault Protection Adjustable Instantaneous Pickup Instantaneous Override On all trip units, an instantaneous override function has been provided. It is set nominally at the short time rating of the respective breaker frame size. This allows the breaker to ride through high faults up to its short time capability; however, it is self-protecting above these values. 5 4 Instantaneous Pickup 6 3 2 xln 7 8 1.5 12 10 Short Time kA Rating (t = 0.
Operations – Ground Fault Protection Adjustable Ground Fault Pickup and Adjustable Ground Fault Delay 23 and erratic. Time constants for the current integration are preset within the unit as a function of the Ground Fault Delay. 24 25 21 20 lg= % MAX RATING 27 30 Fixed .4 28 .5 .3 Ground Fault Sensing Schemes The trip unit can be configured to accommodate the following ground fault sensing schemes: MAX RATING = 2000A • 3-Phase, 3-Wire Residual • 3-Phase, 4-Wire Residual • Source Ground .
Operations – Ground Fault Sensing Schemes Ground Fault Sensing Scheme The following are brief descriptions of the ground fault sensing schemes as they relate to the Siemens Electronic Trip Unit. Detailed technical and application information of the ground fault sensing schemes is contained in NEMA Standard No. PB 2.2 “Application Guide for Ground Fault Protective Devices for Equipment”. Source Ground: In this scheme, the phase currents are not used in detecting and processing ground faults.
Operations – Example Time Current Curve Type SB Breaker Frame Time Current Curve Example: 2000A Ir =%In 70 80 50 14 17 4 2.5 21 30 25 3 4 2.5 5 2 Long Time Delay Secs @6 x ln Short Time 6 Pickup 1.5 xln 7 9 Fixed .2 .15 8 .3 .1 4 Time Delay Curve Adjustments .15 Secs @8 x ln 2 .07 .3 MAX RATING .07 Short .1 It .2 5 Instantaneous Pickup 6 3 2 7 xln 1000A 8 1.5 10 30 9 35 40 27 23 Ground Fault 45 Pickup lg= % 50 20 60 Fixed .4 .1 .2 .2 .1 .3 .
Operating Instructions Part Three – Monitoring the Electronic Trip Unit Trip Unit Test and Monitoring Functions Siemens Electronic Trip Unit is equipped with three standard test and monitoring functions to aid the user in the installation and operation of the SB breaker. Integral Test Modes APM Pass Testing System Check Indicator TEST Trip Ir =%In 70 Continuous 75 65 80 85 60 50 SIEMENS SYSTEM CHECK 95 The trip unit derives its operating power from the phase currents in the SB breaker.
External Accessories Ground Fault Monitor Display The Ground Fault Monitor displays the ground fault current in amps. When the ground fault current reaches a level of 12% below the selected pickup setting, the amps display will start to flash. Then the ground setting, the display will flash “-OL-” for overload and the alarm line will be set to its “ON” state.
External Accessories Display Module D Local Monitor Relay This feature provides a local alarm display and an output signal for an external alarm when the average of the phase currents exceeds the alarm set point. The display automatically resets itself when the alarm condition ceases. The output alarm signal is a 5V DC level. The signal may be used to display an alarm on a remote indication panel or by using an internal Systems Breaker Modular Relay (SBDMR) or (SBBADMR).
Time Current Characteristic Curve Long Time / Instantaneous Protection Configuration Example: 2000A Amperes in Multiples of Rating Plug Value (In) Ir =% In 70 Continuous 75 65 80 85 60 50 lrn = 2000A 90 100 8 SYSTEM CHECK 95 10 5.5 14 17 4 2.5 21 30 25 4 5 2 Long Time Delay Secs @6 x ln Instantaneous Pickup 6 3 SIEMENS Rating Plug 7 xln 8 1.
Time Current Characteristic Curve Long Time / Short Time (Fixed Delay) Protection Configuration Example: 2000A Amperes in Multiples of Rating Plug Value (In) Ir =% In 70 80 50 ln = 2000A 90 100 8 SYSTEM CHECK 95 10 5.5 14 17 4 Long Time Delay Secs 2.5 30 25 3 4 2.5 21 @6 x ln 5 2 Short Time 6 Pickup 1.5 7 9 Fixed .2 .15 .07 Short .1 .07 .3 xln 8 .3 .1 .2 Time Delay .
Time Current Characteristic Curve Long Time / Short Time (I2 t Delay) Protection Configuration Example: 2000A Amperes in Multiples of Rating Plug Value (In) Ir =% In 70 Continuous 75 65 80 85 60 50 ln = 2000A 90 100 8 SYSTEM CHECK 95 10 5.5 SIEMENS Rating Plug 14 Long 17 4 Time Delay Secs 2.5 30 25 3 4 2.5 21 @6 x ln 5 2 Short Time 6 Pickup 1.5 7 9 Fixed .2 .15 .07 Short .1 .1 .07 .3 xln 8 .3 .2 Time Delay .
Time Current Characteristic Curve Long Time / Short Time (Fixed Delay) / Instantaneous Protection Configuration Example: 2000A Amperes in Multiples of Rating Plug Value (In) Ir =% In 70 80 50 ln = 2000A 90 100 8 SYSTEM CHECK 95 10 5.5 14 17 4 Long Time Delay Secs 2.5 30 25 3 4 2.5 21 @6 x ln 5 2 Short Time 6 Pickup 1.5 xln 7 9 Fixed .2 .15 8 .3 .07 Short .1 .1 .07 .3 4 .2 Time Delay .15 Secs @8 x ln 2 It 5 Instantaneous Pickup 6 3 7 xln 2 8 1.
Time Current Characteristic Curve Long Time / Short Time (I2 t Delay) / Instantaneous Protection Configuration Example: 2000A Amperes in Multiples of Rating Plug Value (In) Ir =% In 70 Continuous 75 80 65 85 60 50 ln = 2000A 90 100 8 SYSTEM CHECK 95 10 5.5 14 17 4 SIEMENS Rating Plug Long Time Delay Secs 2.5 30 25 3 4 2.5 21 @6 x ln 5 2 Short Time 6 Pickup 1.5 xln 7 9 Fixed .2 .15 8 .3 .07 Short .1 .1 .07 .3 4 .2 Time Delay .
Time Current Characteristic Curve Ground Fault Protection 400A, 800A, 1200A, and 1600A 40 50 Ground Fault 70 Pickup 25 20 80 100 Fixed .4 90 .5 .3 .1 .2 .2 .1 .3 .5 .4 40 50 I2 t 60 30 25 20 100 Fixed .4 90 .5 .3 .1 .5 .4 40 50 Ig=% (MAX Rating) 25 20 100 Fixed .4 90 .5 .3 .1 .5 38 .4 Ig=% (MAX Rating) Ig=% (MAX Rating) 20 68 .5 .3 Ground Fault MAX RATING = 1200A Ground Fault .2 Delay Secs @.5 .3 MAX Rating 2 It .2 .1 .3 .
Time Current Characteristic Curve Ground Fault Protection 2000A and 2500A Ig=% (MAX Rating) 30 35 40 27 23 20 60 Fixed .4 55 .5 .3 .2 .1 Ground Fault 45 Pickup lg= % MAX 50 Rating .1 .2 .3 .5 I2 t .4 MAX RATING = 2000A Ground Fault Delay Secs @.5 MAX Rating Ig=% (MAX Rating) 29 35 20 48 44 .5 .3 .2 .1 .3 .4 Ground Fault 38 Pickup lg= % MAX 41 Rating .1 .2 .5 Ig=% (MAX Rating) 32 26 23 Fixed .4 Ig=% (MAX Rating) I2 t MAX RATING = 2500A Ground Fault Delay Secs @.
Time Current Characteristic Curve Ground Fault Protection 3200A and 4000A 25 29 20 37 35 .5 .3 .2 .1 .3 23 25 20 30 28 .5 .3 Ig=% (MAX Rating) Ground Fault Delay Secs @.5 MAX Rating .2 .1 .3 .4 Ground Fault 26 Pickup lg= % MAX 27 Rating .1 .2 .5 Ig=% (MAX Rating) MAX RATING = 3200A 24 22 30 I2 t .4 21 Fixed .4 Ground Fault 31 Pickup lg= % MAX 33 Rating .1 .2 .5 Ig=% (MAX Rating) 27 23 21 Fixed .4 Ig=% (MAX Rating) I2 t Ground Fault Delay Secs @.
External Accessories Auxiliary Power Supply WARNING Trip Free Condition. Misoperation or mechanism damage can occur if incorrectly tested. Release power button on APM before closing breaker mechanism Auxiliary Power Supply The auxiliary power supply is used for bench testing the Electronic Trip Unit. The supply may also be used to power the trip unit during the execution of a “go/no-go” type test before bringing the SB breaker on-line (see Monitoring the Trip Unit in the Operating Instructions section).
External Accessories Universal Test Kit (TS-31) General Information DANGER Hazardous Voltage. Will cause death or serious injury. Turn off and lock out all power supplying the device prior to cover(s) removal or while cover(s) are removed and when installing any internal or external accessory. Replace the cover(s) and shield(s) before power supplying this device is turned on. After entering the catalog number information, press the ENTER key.
External Accessories Universal Test Kit (TS-31) I. To proceed, press ENTER again to start the test. Press any other key to STOP the test. Once a test has been started, the TS-31 will respond with: Trip Test. Press Any Key to Abort. Time Remaining: xx.xxx Sec. Be careful at this time. Any key press will abort the test. J. The test may take anywhere from a fraction of a second to minutes to complete, depending on which procedure was run. If the test passes, the TS-31 will display: Test Passed. xxx.
External Accessories Universal Test Kit (TS-31) Testing Parameters — SB ICCB Long Time Trip Out Setting (% of In) 50% 60% 65% 70% 75% 80% 85% 90% 95% 100% 2.5 sec. 96.0 66.7 56.8 49.0 42.7 37.5 33.2 29.6 26.6 24.0 – 224 – 156 – 133 – 114 – 99.6 – 87.5 – 77.5 – 69.1 – 62.0 – 56.0 4 sec 154 107 90.9 78.4 68.3 60.0 53.1 47.4 42.5 38.4 – 358 – 249 – 212 – 183 – 159 – 140 – 124 – 111 – 99.3 – 89.6 5.5 sec 8 sec 10 sec 14 sec 17 sec 21 sec 211 – 493 147 – 342 125 – 292 108 – 251 93.8 – 219 82.
External Accessories Universal Test Kit (TS-31) Testing Parameters — SB ICCB I2T Ground Fault Trip Out Setting (% MAX Rating) 0.1 sec 0.2 sec 0.3 sec 0.4 sec 0.5 sec 20% 21% 22% 23% 24% 25% 26% 27% 28% 29% 30% 31% 32% 33% 35% 37% 38% 40% 41% 44% 45% 48% 50% 0.096 – 0.307 0.196 – 0.608 0.179 – 0.556 0.164 – 0.510 0.150 – 0.470 0.138 – 0.434 0.128 – 0.403 0.119 – 0.375 0.110 – 0.350 0.103 – 0.327 0.096 – 0.307 0.090 – 0.288 0.084 – 0.272 0.079 – 0.257 0.070 – 0.230 0.063 – 0.208 0.060 – 0.198 0.
Ordering Information Electronic Trip Unit 1200A Frame Size Max Rating Continuous Current Setting Long Time Delay Short Time Pickup/Delay Instantaneous Pickup Ground Fault Pickup/Delay SB04TLI SB04TLS SB04TLSI SB04TLIG SB04TLSG SB04TLSIG 400A 400A 400A 400A 400A 400A ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — ✓ ✓ — ✓ ✓ ✓ — ✓ ✓ — ✓ — — — ✓ ✓ ✓ SB08TLI SB08TLS SB08TLSI SB08TLIG SB08TLSG SB08TLSIG 800A 800A 800A 800A 800A 800A ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — ✓ ✓ — ✓ ✓ ✓ — ✓ ✓ — ✓ — — — ✓ ✓ ✓ SB12TLI SB12TLS SB12T
Ordering Information Electronic Trip Unit 3200A Frame Size Max Rating Continuous Current Setting Long Time Delay Short Time Pickup/Delay Instantaneous Pickup Ground Fault Pickup/Delay SB25TLI SB25TLS SB25TLSI SB25TLIG SB25TLSG SB25TLSIG 2500A 2500A 2500A 2500A 2500A 2500A ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — ✓ ✓ — ✓ ✓ ✓ — ✓ ✓ — ✓ — — — ✓ ✓ ✓ SB32TLI SB32TLS SB32TLSI SB32TLIG SB32TLSG SB32TLSIG 3200A 3200A 3200A 3200A 3200A 3200A ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ — ✓ ✓ — ✓ ✓ ✓ — ✓ ✓ — ✓ — — — ✓ ✓ ✓ Max Ratin
Ordering Information Rating Plugs,Transformers, and Miscellaneous Accessories 3200A MAX Ampere Rating 400A MAX Ampere Rating Rating Plug Catalog Number 04SB200 04SB225 04SB250 04SB300 04SB350 04SB400 Rating (Ampere) 200A 225A 250A 300A 350A 400A 08SB400 08SB450 08SB500 08SB600 08SB700 08SB800 Rating (Ampere) 400A 450A 500A 600A 700A 800A 12SB600 12SB700 12SB800 12SB1000 12SB1200 Rating (Ampere) 600A 700A 800A 1000A 1200A 1600A MAX Ampere Rating Rating Plug Catalog Number 16SB800 16SB1000 16SB1200 16
UL Listings and File Numbers Item Listing Trip Unit and Breaker Accessories Drawout CSA E9896 E57501 E135453 LR57039 39
Siemens Energy & Automation, Inc. Distribution Products Division 3333 Old Milton Parkway Alpharetta, GA 30005 © 2000 Siemens Energy & Automation, Inc. Siemens is a registered trademark of Siemens AG Specifications are subject to change without notice. For Nearest Sales Office 1.800.964.4114 www.sea.siemens.com/ sales/salesoffices.html For Product Information www.sea.siemens.com/dpd Order No.IPIM-2203C Supersedes IPIM-2203B Printed in U.S.A.
