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480V Metal-Enclosed Switchgear
General
Siemens low-voltage metal-enclosed
switchgear is used in electric power dis-
tribution systems for the control and pro-
tection of circuits and equipment. The
switchgear employs drawout type low
voltage power circuit breakers described
in Section 4.
LV switchgear is typically installed in:
J Industrial Plants — for power and
lighting networks and feeders, power
generation and other auxiliaries, and to
provide power for machine tools and
material handling eq
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480V Metal-Enclosed Switchgear General Siemens low-voltage metal-enclosed switchgear is used in electric power dis- tribution systems for the control and pro- tection of circuits and equipment. The switchgear employs drawout type low voltage power circuit breakers described in Section 4. LV switchgear is typically installed in: J Industrial Plants — for power and lighting networks and feeders, power generation and other auxiliaries, and to provide power for machine tools and material handling eq
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480V Metal-Enclosed Switchgear 480V Metal-Enclosed Switchgear Construction Details General General Finish Bolted steel / glass polyester compart- ments housing each power circuit break- The Siemens 480 volt switchgear assem- During construction, the structural steel er are mounted in the vertical section to bly consists of one or more metal- parts, panels, and compartments are all form the switchgear assembly. This iso- enclosed, vertical sections. Normally the prepared for painting by a five-st
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480V Metal-Enclosed Switchgear Construction Details General Main and Ground Bus Control Wiring Circuit Breaker Compartments The standard main bus is silver-plated Standard secondary and control wiring is Typical circuit breaker compartments copper. Welded aluminum is also avail- #14 AWG extra-flexible, stranded copper include primary disconnects, ground dis- able. Provisions for future extension of type SIS. Terminations are made with connect, drawout rails, and associated aluminum main bus cond
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480V Metal-Enclosed Switchgear 480V Metal-Enclosed Switchgear Guide Form Specifications General Options Switchgear Mounted Hoist The hoist, optional on type R indoor switchgear, and standard on type SR outdoor switchgear, travels along rails on top of the switchgear to ease breaker handling. TOC and MOC Switches The Truck Operated Cell (TOC) Switch provides interlocking control or remote indication of the breaker racking position. The cubicle mounted auxiliary switch or Mechanism Operated Cell
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480V Metal-Enclosed Switchgear LV Power Circuit Breakers General The Siemens RL series circuit breakers are designed for up to 600 volt service with current carrying capacities of up to 5000 amperes and interrupting capacities of up to 130,000 amperes unfused or 200,000 amperes fused. These compact, fast operating circuit breakers incorporate a stored energy closing mechanism, either manually or electrically charged, for fast, positive closing. A quick-make closing mechanism releas- es the store
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480V Metal-Enclosed Switchgear 480V Metal-Enclosed Switchgear LV Power Circuit Breakers General Ground Connection A ground contact is located on the circuit breaker to connect with the ground cir- cuit. The breaker is grounded in both the connected and test positions. Drawout Interlocks All circuit breakers have drawout inter- locks to: J prevent racking a closed breaker J prevent closing breaker until racked to connected or test position J prevent inserting or withdrawing breaker from compartme
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480V Metal-Enclosed Switchgear LV Power Circuit Breaker Trip Unit General ® Static Trip III Trip Unit Static overcurrent tripping devices have been standard on Siemens circuit break- ers for over thirty years. The Static Trip Ill trip unit features microprocessor-con- trolled tripping, while providing RMS sensing for standard overcurrent protec- tion, and optional metering and communi- cations functions. Located in the lower right side of the breaker, the trip unit is readily accessible for simp
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480V Metal-Enclosed Switchgear 480V Metal-Enclosed Switchgear LV Power Circuit Breaker Trip Unit General Table 4.3 Static Trip III Trip Unit Functions Table 4.5 Static Trip III Metering Functions Model Function Model III IIIC IIICP IIICPX Function IIIC IIICP Self-Powered Overcurrent Protection 3333 Phase Currents RMS Sensing 33 3333 Avg Phase Currents Switchable Thermal Memory 33 3333 d opt opt opt opt Ground Current Ground Fault Protection 33 e opt opt Neutral Current LCD Target 3333 f — Phas
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480V Metal-Enclosed Switchgear 480V Metal-Enclosed Switchgear L LV V Power Circuit Breakers Power Circuit Breakers General RL Breaker Accessories / Table 4.8 Interlock Coil Ratings If desired, a mechanical lockout option may be provided. This substitutes a Modifications (cont’d) Voltage Range manual reset for the automatically reset Nominal Control Pickup Dropout Operation Counter Voltage Voltage Voltage tripping actuator. In this case the breaker A mechanically-operated, 5-digit non- 120 104 36
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480V Metal-Enclosed Switchgear 480V Metal-Enclosed Switchgear VT, CPT, CT Data Technical Table 4.10 Voltage Transformers Accuracy Class at 60 Hz Thermal Burden Volt-Amp Rating Ratio WX Y Rating VA Hertz 600:120 0.6 0.6 1.2 100 150 50/60 480:120 0.6 0.6 1.2 100 150 50/60 288:120 0.6 0.6 1.2 100 150 50/60 Table 4.11 Control Power Transformers—115°C Rise Primary Secondary kVA Phase Voltage Voltage 3 5 Single 240/480 120/240 a 10 a 15 a Requires complete compartment. b Table 4.12 Current Transformer
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480V Metal-Enclosed Switchgear 480V Metal-Enclosed Switchgear L LV V Power Circuit Breakers Power Circuit Breakers Ratings Technical Table 4.14 Type RL Low-Voltage Power Circuit Breaker Ratings At 50 / 60 Hertz Short Circuit Rating Insulation Voltage Ratings Symmetrical Current Level Short Time Continuous Dielectric Rating With Without Current Frame Breaker Rated Rated Max. Withstand Symmetrical Instantaneous Instantaneous Rating Size Amperes Type Volts Volts Volts Amperes Trip Amperes Trip Ampe
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480V Metal-Enclosed Switchgear 480V Metal-Enclosed Switchgear LV Power Circuit Breakers Ratings Technical Table 4.15 Type RLF Fused Circuit Breaker Ratings At 50/60 Hertz Voltage Ratings Insulation Short Circuit Range Continuous Frame Rated Rated Max. Level Dielectric Ratings of Fuse Current Size Amperes Type Volts Volts Withstand Volts Symmetrical Amps Rating Amperes Rating Amperes RLF-800 250–1600 75–800 800 RLF-1600 2200 200,000 800–3000 75–1600 1600 RLF-2000 4000 75–2000 2000 RLF-3200 & 3200
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480V Metal-Enclosed Switchgear LV Power Circuit Breakers Technical ® Time/Current Characteristics of Static Trip III Trip Unit 4 Siemens Electrical Products and Systems 62 CSI Section 16470 Specification Guide 480V Metal-Enclosed Switchgear
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480V Metal-Enclosed Switchgear 480V Metal-Enclosed Switchgear Weights and Dimensions Dimensions Siemens 480 volt switchgear can be The major assembly sections include: configured in many ways by combining J Transition Sections — used as transi- different section types. Up to five vertical tion to liquid filled transformer or to sections plus a transition section can be outdoor dry type transformers. shipped together as a unit. If all vertical J Auxiliary Sections — used as incom- sections are n
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480V Metal-Enclosed Switchgear Auxiliary / Breaker Section Dimensions Dimensions Auxiliary Sections — Front Views Main Breaker Sections — Front Views Feeder Breaker Sections and Combinations — Front Views Table 4.21 Auxiliary Section Weight in lbs. (kg) R22 R30 Indoor 1000 (455) 1200 (545) Outdoor 2000 (909) 2400 (1091) Dimensions in Inches (mm) Table 4.22 Breaker Section and a Connection Weights in lbs. (kg) R22 R30 R36 Indoor 1400 (636) 1900 (864) 2210 (1005) Outdoor 2400 (1091) 3100 (1409) —
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480V Metal-Enclosed Switchgear 480V Metal-Enclosed Switchgear Indoor Floor Plan, Side View Dimensions Indoor Floor Plan Dimensions in Inches (mm) 1 This transition required for liquid filled and outdoor dry type transformers only. 2 Cable space is 13.2 in. (335 mm) in depth for bottom entry with circuit breaker in bottom compartment. (Refer to side view.) Indoor Side View Switchgear (Up to 4000A) Switchgear (5000A) Dimensions in Inches (mm) 4 Bolting Arrangement Siemens Electrical Products and S
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480V Metal-Enclosed Switchgear Outdoor Floor Plan, Side View Dimensions Outdoor Floor Plan Dimensions in inches (mm) 1 Cable space is 22.4 in. (569 mm) depth for 30.0” (762 mm) Door bottom entry with circuit breaker in bottom Hinges on Extension compartment. Dimensions in inches (mm) 4 Bolting Arrangement Outdoor Bolting Arrangement Type SR (Side View) Siemens Electrical Products and Systems 66 CSI Section 16470 Specification Guide 480V Metal-Enclosed Switchgear
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480V Metal-Enclosed Switchgear 480V Metal-Enclosed Switchgear Guide Form Specifications Specifications J This equipment specification guide NEMA SG 5 — Power Switchgear Secondary control contacts, when provides information for describing a Assemblies required, shall be located in the circuit typical metal enclosed low voltage power breaker compartment and shall be of the J (option) NEMA 210 — Secondary circuit breaker switchgear assembly. sliding contact, silver-plated copper Unit Substations It
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480V Metal-Enclosed Switchgear Guide Form Specifications Specifications reaching over the main and vertical bus. Solid State Trip Units Front and rear doors are to be gasketed Bus bracing shall be equal to the short and hinged. Front doors, located at each Solid state trip units shall be Siemens circuit interrupting rating of the lowest end, are to include panic release door hard- J Static Trip III (basic device) rated non-fused circuit breaker applied in ware, three point latches, and provision
