WL Arc Resistant Low Voltage Switchgear Product guide usa.siemens.com/switchgear WL Arc Resistant Low Voltage Switchgear Features, Benefits and Ratings Enhanced safety • One piece circuit breaker compartment doors with insert panels Siemens now offers arc resistant, metal-enclosed, low for control devices such as fuses, indicating lights and circuit voltage switchgear designed to provide an additional degree breaker control switches when required. of protection for personnel performing normal operating duties • Reinforced bolted rear covers. in proximity to the energized equipment. Such duties include • Insulated/Isolated bus bar system. opening or closing circuit breakers, closed door circuit breaker • Integrally designed circuit breaker door sealing frame that racking, reading instruments, or other activities that do not allows the user to rack a circuit breaker to connect, test or require cover removal or opening doors (other than auxiliary/ disconnect position without having to install additional instrument compartment doors). hardware (bellows, shrouds, etc) and still maintain arc resistant rating of the apparatus. Why arc resistant switchgear • Shutters in circuit breaker compartments. Standard metal-enclosed switchgear is designed to withstand the mechanical forces generated by bolted faults on the load • Riser Base with integrated arc plenum. terminals until a power circuit breaker or other protective device • Four high power circuit breaker stacking capability. No can interrupt the flow of fault current. This capability is verified additional stacking/configuration restrictions. by short-circuit and short-time withstand tests on the equipment • All section configurations available. Available in solidly and interruption tests on the power circuit breakers. During grounded or resistance grounded configurations. a bolted fault, the voltage at the fault location is essentially • Non-fused non current-limiting circuit breakers allow full zero and the fault energy is dissipated throughout the power power coordination. system. The arc generated within the power circuit breaker during interruption is cooled and extinguished by the circuit Recommended optional features breaker arc chutes. The minimal out gassing of arc byproducts • Overhead plenum with exhaust duct. The system is designed from the arc chutes is contained by the switchgear as verified to transfer the byproducts of the arcing event (smoke, by interruption tests. particulate matter, heat, etc.) away from the immediate vicinity of the low voltage switchgear when an internal arcing fault Siemens arc resistant low voltage switchgear provides an added occurs. Typically, the exhaust duct will vent the byproducts to a degree of protection over standard metal-enclosed switchgear. location usually outside of the room in which the low voltage In addition to bolted faults, Siemens WL arc resistant low voltage switchgear is located. The overhead plenum is attached to the switchgear is designed and performance tested to ANSI/IEEE roof of the low voltage switchgear, and can be exhausted in C37.20.7 to provide protection from the hazards of internal any direction ((left, right, forward, backward) away from the arcing faults. An internal arcing fault can be caused by switchgear assembly or unit substation. insulation degradation, insulation contamination, entrance of • Dynamic Arc Flash Sentry (DAS). DAS employs the unique vermin, foreign objects coming into contact with the energized dual parameter setting capability of the ETU776 trip unit, bus, or any other unplanned condition that creates an electrical coupled with the ability to easily toggle to a lower arc flash discharge path through air. During an arcing fault, the voltage parameter set. A normal operation parameter set can be at the fault location is essentially the system voltage and the optimized for selective trip coordination, while the second set fault energy is focused within the switchgear enclosure. Arc is optimized for lower arc flash energy levels. The dynamic temperatures can exceed 20,000 degrees Kelvin, rapidly heating action comes from the ability to switch from the normal the air and vaporizing metal parts. The expanding plasma creates operation set to the arc flash limiting set based on the presence severe mechanical and thermal stress in the equipment which of personnel as they approach the flash protection boundary. can blow open doors and covers and burn through or fragment the enclosure. • Zone Selective Interlocking (ZSI). If WL circuit breakers are arranged in several levels and minimum delays are desired, Standard features it is advisable to use the ZSI module. The circuit breakers are interconnected by these modules. In the event of a short-circuit, • ANSI/IEEE Type 2B Arc Resistant to protect personnel at the all circuit breakers communicate to determine and isolate the front, back and sides of the equipment. exact short-circuit location. Thus, only the closest upstream • UL Listed, performance tested and classified as arc resistant in circuit breaker will be opened. The ZSI module provides the accordance with ANSI/IEEE C37.20.7. complete range of selectivity with the short delay time of • Reinforced enclosure to withstand pressure from internal tzsi = 50 ms. By shortening the delay time, the ZSI module arcing faults. significantly reduces arc duration, stress and damage in the • Internal venting system with pressure dams and pressure vents event of a short-circuit in the switchgear. to channel the flow of arc fault gases and vent these gases out • High resistance grounding. Reduces available fault current the top of the gear and away from personnel. during ground faults thereby reducing arc energy. • Reinforced and gasketed front doors with additional hinges and latching means. Ratings Enclosure type • ANSI/IEEE Type 2B accessibility • NEMA 1 indoor • Maximum internal arcing short-circuit current: 100kA @ 508V and 85kA @ 635V Industry standards • WL power circuit breaker frames range from 800A to 6000A • UL-1558 • 3 and 4 pole WL power circuit breakers • ANSI/IEEE C37.20.1 • Maximum arcing duration: 500 msec • ANSI C37.51 • Vertical bus continuous current ratings to 6000A • ANSI/IEEE C37.20.7 • Horizontal bus continuous current ratings to 6000A • Maximum voltage: 635V • 3 Phase 3 Wire, 3 Phase 4 Wire • 50/60 Hz Dimensional data 1.25 (32) (1.25Typ.) (32) Rear (Typ.) 5.11 (130) 4.59 118.0 (2997) Minimum Ceiling Height Required (See Note 4) 5.11 (130) (Typ.) 118.0 (2997) Minimum Ceiling Height Required (See Note 4) 4.59 Lifting Holes (3) (116)(Typ.) Optional Hoist 3.27 (83) Lifting Holes (3) 5.20 (132) (Note 1) (116) Optional Hoist Vent Stack 3.27 (83) 5.20 (132) (Note 1) 11.40 Vent Stack (289) B Maximum Space 11.40 4.0 (289) B ForM Cablesaximum Belo Spwace 4.0 For Cables Below 2.28 4.00 (101) (Note 2) (Typ.)2.28 4.00 (101) (Note 2) (57)(Typ.) (57) 24.9 (632) Hoist E24.9xtension (632) Maximum Space Hoist Extension B1 ForM Cablesaximum Ab oSpveace Transformer B1 TrTansfhroaormert For Cables Above A Throat A CL CL 1.25 (51) (Typ.) G 1.25 (51) (Typ.) G transformers only transformers only End Trim Panel (Typ.) Required on left and 106.5 (2705) 96.0 End Trim Panel (Typ.) Top of Hoist rightRequ endired of onswitchgear left and 106.5 (2705) (2438)96.0 Top of Hoist Space for lineupright - end adds of 2" switchgear (2438) secondarSpace fyor to total lineup width 5.00 lineup - adds 2" 14.9 leadssecondar from y (127) to total lineup width (378)14.9 ableadsove (Note from 6) 5.00 (378) above (Note 6) (127) 2.12 (54) Non-fused 32.59 (828) 2.12 (54) FusedNon-fused 37.59 (955) 32.59 (828) 3.00 (76) Fused 37.59 (955) 3.00 (76) 2.00 (4) Holes for (51)2.00 39.0 (991) Minimum .50(12mm)(4) Holes for (51) Grade 5 Aisle39.0 Spa (991)ce Requi Minimumred .50(12mm) Space for 7.00 Non-Fused 13.88 (353) anchorGrade bolts 5 (179) Aisle Space Required secondarSpace fyor 7.00 FusedNon-Fused 18.88 (480) 13.88 (353) 42.0 (1067) Minimum 36.0 (914) M inimum anchor bolts (179) leadssecondar from y Fused 18.88 (480) Aisle Spa42.0c (1067)e Recommended Minimum Aisle36.0 Spa (914)ce Requi M inimumred beloleadsw from Aisle Space Recommended Aisle Space Required below 4.40 (179) 2.37(60) 4.40 (179) 2.37(60) Floor or Pad Surface Riser Base 4.0 (102) Note 3 1.00 (25) Floor or Pad Surface Riser Base 4.0 (102) Note 3 2.001.00 (51) (25) 1.00(25) W 2.00 (51) 2.37(60) G 1.00(25) W 2.37(60) G A Front A Plan view (WL Arc Resistant Switchgear Side view without Optional Overhead Plenum) A = Equipment Depth +2.6 (66) Anchor Bolt Spacing Equipment Cable direction below Cable direction above G = Equipment Depth – 0.88 (22) depth B B1 60 (1524) Non-fused 20.00 (508) 1 13.68 (347) 65 (1651) Fused 20.00 (508)1 13.68 (347) Equipment minimum width W 70 (1778) Non-fused 30.00 (762)1 23.68 (601) 3 Pole FS2 22 (559) 75 (1905) Fused 30.00 (889)1 23.68 (728) 3 Pole FS3 32 (813) 80 (2032) Non-fused 40.00 (1016)1 33.68 (855) 4 Pole FS2 32 (813) 80 (2032) Fused 35.00 (889)1 28.68 (728) 4 Pole FS3 40 (1016) 1 Space available for cables below is reduced by 5.20 inches when a lower neutral bus is present. WL Arc Resistant Low Voltage Switchgear Dimensional data 35.0 (889) Note: Dimensions shown in inches and (mm). Drawings are not to scale. 1. Space available for cables below is reduced by 5.20 inches when a Exhaust Duct 13 Overhead Exhaust Duct lower neutral bus is present. Overhead Plenum Width = 21.36 (542) (330) Plenum 2. Space available for cables below is reduced by 4.00 inches if an 800-3200A circuit breaker is located in the bottom compartment.