Panel SCCR 50kA RMS Symmetrical 480V Maximum

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3 Panel SCCR 50kA RMS Symmetrical 480V Maximum 4

4 Short-Circuit Current Rating SCCR: The perspective or maximum symmetrical fault current at a nominal voltage to which an apparatus or system is able to be connected without sustaining damage exceeding the defined acceptance criteria. 5

5 SCCR of Components or Combinations In UL 508A, the term short circuit current rating, refers to either: Overcurrent Protective Devices (Interrupting Ratings) Power components short circuit current ratings or Combinations of the two Overcurrent Protective Device Power components 6

6 Available Fault: 480V 7

7 460 Volt X 52.2kA Available 200 A 100 A 450 A System studies are used to determine the available fault at any specific electrical location 20 feet 3 1/phase 4/0 AWG Cu THW wire In conduit 60 feet 3 1/phase #2 Cu wire THW in conduit 20 feet 2 1/phase 1000kcmil Cu wire THW in conduit X Industrial Control Panel A 42.6kA X Industrial Control Panel B 13.4kA X X Industrial Control Panel C 44.4kA 4.0kA Isolation Transformer 175 kva 460V primary 460 V secondary Z=5%

8 # of Occurrences Survey of 300 Industrial Installations Available Fault 480V (ka) Installation Fault Levels

9 10 UL 508A Supplement SB Determining Panel Short Circuit Current Ratings

10 How to determine SCCR of a panel?

11 Determining SCCR s 3 Basic Steps

12 SB4.2.1 Individual Power Circuit Components

13 SB4.2.1 Individual Power Circuit Components

14 SB4.2.2 Establish SCCR of Components 100-C Contactor Nameplate & Instruction Sheet PowerFlex 70 Drive User Manual

15 SB4.2.2 Establish SCCR of Components 100-C Contactor Nameplate Installation Sheet

16 SB4.2.2 Establish SCCR of Components 100-C Contactor Nameplate & Instruction Sheet PowerFlex 70 Drive User Manual

17 Table SB4.1 Unmarked Components 508A SB - Table SB4.1 Assumed SCCR s Line up with UL minimum test SC test requirements to attain listing These minimum ratings limit high fault panel ratings High Fault SCCR s on all components & combinations are top priority

18 SB4.2.2 Establish SCCR of Components

19 xxka SCC Available Current Limiting Device in Feeder xxka Ip Letthrough Use of high fault rated components virtually eliminates the need to apply the current limiting provisions! Branch Circuit PD Motor Controller xxka SCCR

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21 Feeder Circuit Definition Feeder Circuit covers all power conductors and components from incoming feeder disconnect,. to the line side of the last branch circuit protective device (BCPD). Feeder Circuit Branch CPD

22 Branch Circuit Definition Branch Circuit covers all power conductors and components from the load-side of the branch circuit,. to the controller load-side connections. Branch Circuit Branch CPD Terms used for protection devices: Over-current Protection Device (OPD) Branch Circuit Protection Device (BCPD)

23 100kA 65kA 65kA 100kA 65kA 70kA 100kA

24 100kA 65kA 70kA 65kA Use the lowest of the ratings of any branch component or branch protective device to determine branch rating.

25 100kA 200kA 100kA 65kA 70kA 65kA

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27 100kA 200kA 100kA 65kA 70kA 65kA Panel rating is 65kA.

28 NEC Article now requires Industrial Control Panels to be marked with Short Circuit Current Ratings

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30 Available Fault: 480V 100kA 100kA 65kA 70kA 65kA Panel SCCR 65kA rms Symmetrical 480V

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32 Panel SCCR 65kA rms Symmetrical 480V Available Fault: 480V

33 # of Occurrences Survey of 300 Industrial Installations Available Fault 480V (ka)

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35 Use of Power Transformers with Isolated Secondary OPD SCCR

36 SB4.3.1 Current Limiting w/ Power Transformers SB4.3.1 For branch circuits supplied by a power transformer with an isolated secondary winding, the short-circuit current rating on the line side of the transformer shall be one of the following: a) For a power transformer rated not more than 10 kva, and where the short circuit current rating of all components in the secondary circuit are not less than 5 ka, the short-circuit current rating of the primary over-current protective device (OPD) is assigned to the line side of the power transformer circuit. 10 kva Max OPD SCCR Power Transformer (10 kva max meeting above) The SCCR of the OPD must be equal or greater than the Panel SCCR All secondary components must have a SCCR > 5kA to maintain SCCR of OPD

37 SB4.3.1 Current Limiting w/ Power Transformers OPD SCCR Power Transformer (5 kva max meeting above) The SCCR of the OPD must be equal or greater than the Panel SCCR 5 kva Max, 120V Sec. Other Transformer The SCCR of the circuit is equal to lowest rated secondary component and must be equal or greater than the Panel SCCR. All secondary components must have a SCCR > 2kA to maintain SCCR of OPD

38 65kA SCC Available Feeder CB Current Limiting 65kA SCCR??kA Ip Letthrough This is what we are evaluating Branch Circuit PD 65kA SCCR Motor Controller 18kA SCCR

39 65kA SCC Available Feeder CB Current Limiting 65kA SCCR??kA Ip Letthrough Branch Circuit PD 100kA SCCR Motor Controller 18kA SCCR

40 Current Limitation UL Listed Circuit Breakers 17kA Let Through Current Limiting Circuit Breakers 65kA Available

41 65kA 65kA SCC Available Feeder CB Current Limiting 65kA SCCR 17kA Ip Letthrough Branch Circuit PD 100kA SCCR Feeder Circuit Protective Device limits branch SCCR to 65kA. Motor Controller 18kA SCCR

42 65kA 65kA SCC Available Feeder CB Current Limiting 100kA SCCR 17kA Ip Letthrough Branch Circuit PD 65kA SCCR Branch Circuit Protective Device limits Branch SCCR to 65kA Motor Controller 18kA SCCR

43 65kA SCC Available Feeder CB Current Limiting 65kA SCCR 17kA Ip Letthrough 10kA Motor Controller limits branch SCCR to 10kA. Note: Branch does not meet available fault current. Branch Circuit PD 65kA SCCR Motor Controller 10kA SCCR

44 65kA SCC Available Feeder Fuse Switch 200kA SCCR 60A Class J??kA Ip Letthrough Branch Circuit PD 200kA SCCR Motor Controller 10kA SCCR

45 65kA SCC Available Feeder Fuse Switch 200kA SCCR 60A Class J??kA Ip Letthrough Branch Circuit PD 200kA SCCR Motor Controller 10kA SCCR

46 Current Limitation UL Listed Fuses 65kA available Must use 100kA or 200kA columns Current Limiting Fuses

47 Current Limitation UL Listed Fuses 16kA Let Through at 200kA Current Limiting Fuses 10kA Let Through at 100kA Using 100kA limits let through to < 10kA needed for branch components

48 100kA 65kA SCC Available Feeder Fuse Switch 200kA SCCR 60A Class J 10kA Ip Letthrough Branch Circuit PD 200kA SCCR SCCR of the feeder fuse rating per Table SB4.2 is 100kA to limit the feeder let through below the motor controller SCCR. Branch SCCR is 100kA. Motor Controller 10kA SCCR

49 65kA SCC Available 65kA Feeder Fuse Switch 200kA SCCR 60A Class J 10kA Ip Letthrough As in previous example the feeder fuse has a SCCR rating of 100kA. The branch circuit protective device limits rating. Branch SCCR is 65kA Branch Circuit PD 65kA SCCR Motor Controller 10kA SCCR

50 65kA SCC Available Feeder Fuse Switch 200kA SCCR 60A Class J 10kA Ip Letthrough Feeder let through current exceeds motor controller SCCR. Current limiting does not apply. Branch SCCR remains at 5kA. Note: Branch does not meet available fault current. Branch Circuit PD 200kA SCCR Motor Controller 5kA SCCR 5kA

51 SCCR: 100kA max 25kA Available

52 Feeder low letthru affect on the Branch Motor Controller SCCR is 10kA Let through of feeder fuse is 8kA at 50kA available SCCR: 50kA 25kA Available

53 Notes: All BCPD s must cover the available fault level The SCCR of all BCPDs must be > 25kA Cannot use Feeder letthrough current limiting to use BCPDs with an SCCR rating less than the available fault Panel rating is 25kA SCCR: 25kA 25kA Available

54 Sizing/Coordination issues 10kA Standard Fault Motor Controller = 51 hp minimum!

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56 Branch Circuit Solutions 60

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58 62 - SCCR: 460V - 3C Starters w/ UL MCP - Type 2 Coordination

59 Global Voltages: 220V, V, 415V, 440V, 525V, 690V 50Hz V, 230V, 460V, 575V 60Hz Short Circuit Performance: 70 & 100kA Type 1, Type 2 Coordination Branch Protection Devices: Fuses & Circuit Breakers Soft-Starters: (1..1,200A) SMC-3 SMC-50 SMC Flex Starting Modes: Line & Delta Connected Motors Standard & Heavy Duty

60 SMC-3 & SMC Flex SMC-50 Line Connected Delta Connected Line Connected Delta Connected Fuse SCPD BCPD Fused Disconnect BCPD Fused Disconnect BCPD Fused Disconnect K1M Input K1M Input K1M Input K1M Input Terminal Block SCR Fuse SCR Fuse SCR Fuse SCR Fuse SMC-3 SMC-3 R By-pass Starter R By-pass Starter SMC-50 SMC 50 K2M Output K2M Output K2M Output K2M Output M 3~ M 3~ M 3~ M 3~

61 Short-circuit Coordination Starter Type: S.C. Protective Device: Soft-starter - Delta Connected Motors Heavy Duty Rating - AC53a Fuses + Line Contactors + SMC-50 UL/CSA Class J Fuses, Current Limiting - SCCR: 460V - UL Fuse Protection - Normal Duty Starting - Type 2 Coordination BCPD Fused Disconnect K1M Input Distribution Block SCR Fuse Line Contactor: 100-C, 100-D (100S-C, 100S-D) Soft-starter: SMC-50 Smart Motor Controller Rated Operational Voltage: 460V 60Hz (480V Line) Test Voltage: 600V 60Hz Rated Conditional S.C. Current (Iq): 100kA (rms sym.) Level of S.C. Coordination: Type "1" or "2" per IEC UL 508 High Fault SCCR M 3~ R SMC-50 K2M Output By-pass Starter Motor SMC-50 (Heavy Duty) Branch Circuit Protection Device - Fuse Dist Block Line Contactor Bypass Starter 6) SCR Fuse (Optional) IEC Coordination 3 ph 1500 rpm Thermal Utilization App. Current Max. Current Disconnect Switch Input/Output Contactor OLR Max Current Coordination Cat. No. Setting Category Class Rating Rating Cat. No. Cat. No. Cat. No. Cat. No. Cat. No. Adj range Class Rating Type [HP] [A] 1) 2) [A] IEC ) (A) [A] Class J & L Fuses 4) 4) 5) SB2NBD AC53a: : 99-1 J R-J BG 100-C C EEGE A70QS SB2NBD AC53a: : 99-1 J R-J BG 100-C C EEGE A70QS SB2NBD AC53a: : 99-1 J R-J BG 100-C C EEGE A70QS SB2NBD AC53a: : 99-1 J R-J BG 100-C C EEVE A70QS SB2NBD AC53a: : 99-1 J R-J BG 100-D D EEHF A70QS SB3NBD AC53a: : 99-1 J R-J BG 100-D D EEJF A70QS SB3NBD AC53a: : 99-1 J R-J BG 100-D D EEJF A70QS SB4NBD AC53a: : 99-1 J R-J BG 100-D D EEKG A70QS SC1NBD AC53a: : 99-1 J R-J ) 100-D D EEKG A70QS SC2NBD AC53a: : 99-1 J 600 1, R-J ) 100-D D EELG A70QS SC3NBD AC53a: : 99-1 L 600 1, R-L ) 100-D D EELG A70QS SD1NBD AC53a: : 99-1 L 800 1, R-L ) 100-D D EEMH A70QS 500 Type 1 42kA SD1NBD AC53a: : 99-1 L 900 1, R-L ) 100-D D EEMH A70QS 500 Type 1 42kA SD2NBD AC53a: : 99-1 L 1,000 1, R-L ) 100-D D EEMH A70QS 600 Type 1 42kA SD3NBD AC53a: : 99-1 L 1,200 2, R-L ) 100-D D EENH A70QS 700 Type 1 42kA Note: Heavy Duty Ratings - AC53a: Typical applications include centrifugal fans, crushers, mixers, long conveyors, etc. Start NOT TO EXCEED: 350% of the motor FLA, 30 sec. start time, 99% on-load factor, 1 start per hour, with 50 C surrounding air ambient temperature. Refer to Estimation & Thermal Selection Wizards to ensure the SMC selection meets the application requirements. See Note: Heavy Duty Starting may require upsizing of the fuse and/or line contactors and bypass starter. [A] 6) [A] 7) Type 2 Type 2 Remark 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8)

62 Global Voltages: 220V, V, 415V, 440V, 525V, 690V 50Hz 230/240V, 460/480, 575/600V 60Hz Short Circuit Performance: 65 & 100kA IEC Type 1 & 2 Coordination Branch Protection Devices: Fuses & Circuit Breakers (MCCB, MPCB) PF Drives: (1..800A) PowerFlex 520 Series PowerFlex 4/4M PowerFlex 750 Series Circuit Variables: Circuit Protection Components Power/Line Conditioning Components Control Components

63 R Short-circuit Coordination Starter Type: AC Variable Frequency Drive PowerFlex 525 S.C. Protective Device: UL/CSA Class J or T Fuses, Current Limiting Standard Fuse Selection for Component Sizing Input/Output Contactor: 100-C, 100S-C Bypass Starters: 100-C, 100S-C and 193-E1 Plus, E3 & E3 Plus Rated Operational Voltage: 460V 60Hz (480V Line) Test Voltage: 480V 60Hz Rated Conditional S.C. Current (Iq): 100kA (rms sym.) Level of S.C. Coordination: Type "1" or "2" per IEC Fuse SCPD K1M Input Line Reactor PF 525 K2M Output By-pass Starter M 3~ - SCCR: 460V - UL Fuse Protection - Standard Fuse Sizing (Max) - Normal & Heavy Duty Starting - Type 2 Coordination Motor Ratings Drive Ratings - Normal Duty 2) SCPD - Fuse Line Reactor Contactor Bypass Starter 7) IEC Coordination 3 ph 1500 rpm Input Output w/o EMC Filter w/ EMC Filter Disconnect Switch Input/Output Input Output Contactor OLR Coordination Cat. No. Cat. No. Max. Fuse Size Cat. No. Cat. No. Cat. No. Cat. No Cat. No Adj range Type [HP] [A] 1) kva [A] [A] UL Class [A] 3) 4) 5) 5) 5) 6) [A] Remark 1/ B-D1P4N104 25B-D1P4N114 J, T 6 194R-J RA1-C/B 100-C C C EECB / B-D2P3N104 25B-D2P3N114 J, T 6 194R-J RA2-A/A 100-C C C EECB B-D2P3N104 25B-D2P3N114 J, T R-J RA2-A/A 100-C C C EECB / B-D4P0N104 25B-D4P0N114 J, T R-J RA4-B/B 100-C C C EECB B-D4P0N104 25B-D4P0N114 J, T R-J RA4-B/B 100-C C C EECB B-D6P0N104 25B-D6P0N114 J, T R-J RA8-C/C 100-C C C EECB B-D010N104 25B-D010N114 J, T R-J RA8-B/B 100-C C C EEDB Type / B-D013N104 25B-D013N114 J, T R-J RA12-B/B 100-C C C EEDB B-D017N104 25B-D017N114 J, T R-J RA18-B/B 100-C C C EEEB B-D024N104 25B-D024N114 J, T R-J RA25-B/B 100-C C C EEFD B-D030N104 25B-D030N114 J, T R-J RA25-B/B 100-C C C EEFD B-D037N114 J, T R-J RA35-B/B 100-C C C EEFD B-D043N114 J, T R-J RA45-B/B 100-C C C EEGE Motor Ratings Drive Ratings - Heavy Duty 2) SCPD - Fuse Line Reactor Contactor Bypass Starter 7) IEC Coordination 3 ph 1500 rpm Input Output w/o EMC Filter w/ EMC Filter Disconnect Switch Input/Output Input Output Contactor OLR Coordination Cat. No. Cat. No. Max. Fuse Size Cat. No. Cat. No. Cat. No. Cat. No Cat. No Adj range Type [HP] [A] 1) kva [A] [A] UL Class [A] 3) 4) 5) 5) 5) 6) [A] Remark 1/ B-D1P4N104 25B-D1P4N114 J, T 6 194R-J RA1-C/B 100-C C C EECB / B-D2P3N104 25B-D2P3N114 J, T 6 194R-J RA2-A/A 100-C C C EECB B-D2P3N104 25B-D2P3N114 J, T R-J RA2-A/A 100-C C C EECB / B-D4P0N104 25B-D4P0N114 J, T R-J RA4-B/B 100-C C C EECB B-D4P0N104 25B-D4P0N114 J, T R-J RA4-B/B 100-C C C EECB B-D6P0N104 25B-D6P0N114 J, T R-J RA8-C/C 100-C C C EECB B-D010N104 25B-D010N114 J, T R-J RA8-B/B 100-C C C EEDB Type / B-D013N104 25B-D013N114 J, T R-J RA12-B/B 100-C C C EEDB B-D017N104 25B-D017N114 J, T R-J RA18-B/B 100-C C C EEEB B-D024N104 25B-D024N114 J, T R-J RA25-B/B 100-C C C EEFD B-D030N104 25B-D030N114 J, T R-J RA25-B/B 100-C C C EEFD B-D037N114 J, T R-J RA35-B/B 100-C C C EEFD B-D043N114 J, T R-J RA45-B/B 100-C C C EEGE

64 Global Voltages: 110V, V, V, 415V, 440V, 525V 50Hz 120V, 230/240V, 460/480, 575/600V 60Hz Short Circuit Performance: 65 & 100kA IEC Type 1 & 2 Coordination Branch Protection Devices: Fuses & Circuit Breakers (MCCB & MPCB) Servo Drives: 300/ /6500 Circuit Variables: Circuit Protection Components Power/Line Conditioning Components Control Components

65 Short-circuit Coordination - SCCR: 460V - UL Fuse Protection - Type 2 Coordination Controller Type: Servo Drives Kinetix 300/350 S.C. Protective Device: UL/CSA Class CC Fuses, Fast-Acting Current-Limiting Standard Fuse Selection for Component Sizing Input Contactor: 100-C, 100S-C Rated Operational Voltage: 460V 60Hz (480V Line) Test Voltage: 480V 60Hz Rated Conditional S.C. Current (Iq): 100kA (rms sym.) Level of S.C. Coordination: Type "1" or "2" per IEC Fuse BCPD K1M Input Line Filter KTX 300 M 3~ Drive Ratings Servo Drive BCPD - Fuses Line Filter Contactor IEC Coordination Continuous Output Phases Input Main AC Input Current Disconnect Switch Side Mount Rear Mount Input Isolation Coordination RMS Voltage RMS Pk Cat. No. Max. Fuse Size Cat. No. Cat. No. Cat. No. Cat. No. Type [A] [kw] 1 or 3 [V] [A] [A] 1) UL Class 2) [A] 3) 4) 5) V34PR3 CC R-C F4 100-C V34PR5 CC R-C F5 100-C12 Type V34PR6 CC R-C F C Remark 1) Alternate catalog number for Kinetix 350, add -LM extension 2) Maximum fuse size for UL Class CC, Bussmann KTK-R 3) Disconnect switch provides direct mounting of Class CC fuses 4) Incomplete catalog number, add coil voltage code and auxiliary contacts 5) Short Circuit Coordination between branch circuit protection device and input isolation contactor Note: This data is subject to change by Rockwell Automation without notice. Go to for latest information.

66 Focus on Branch Circuit Solutions: Electromechanical Starters Soft-Starters Low Voltage AC Drives Servo Drives Selection based on: Common Voltage & Frequency Common SCCR Common Level of Coordination Data subject to change: New component introductions Optimized combination ratings Always Use Current Posted Documentation

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