Catalog · EN — Siemens Energy's 2022 catalog of high-voltage circuit breakers from 72.5 kV up to 1100 kV: the modular 3AP live tank and dead tank platform (one, two or four interrupter units per pole), the SF6-free 3AV1 Blue vacuum/clean-air breakers, the 3AP1 DTC Dead Tank Compact hybrid switchgear and the 3AP DCB Disconnecting Circuit Breaker — with the stored-energy spring drive, self-compression and vacuum interruption principles, testing regime, and complete platform ratings tables.
Circuit breakers are the central part of air-insulated (AIS) and gas-insulated (GIS) switchgear. High-voltage circuit breakers are mechanical switching devices which connect and break current circuits (operating currents and fault currents) and carry the nominal current in closed position. For more than 150 years Siemens Energy has been shaping and improving the energy world — more than 220,000 circuit breakers delivered to 150 countries prove this.
The portfolio introduced in this brochure ranges from 72.5 kV up to 1100 kV and comprises live tank and dead tank circuit breakers as well as hybrid solutions combining different functions in a compact design: the Dead Tank Compact (DTC) and the Disconnecting Circuit Breaker (DCB). All products are manufactured on a proven modular design encompassing a platform of interrupter units, operating mechanisms and control elements for all circuit breaker types, whether for GIS or AIS applications.
Sustainability is core: the company's ambition is climate-neutrality in its own operations by 2030 and covering 100% of its own electricity consumption from renewable sources by 2023. Sustainable means Zero SF6 gas, Zero F-mix-gases and Zero greenhouse gases — the Blue products with vacuum interruption and clean air insulation pave the way for climate-neutral high-voltage switchgear.
High-voltage circuit breakers from Siemens Energy, regardless of type or voltage range, are designed on a well proven modular platform concept. The main components — operating mechanism, control system, base frame, kinematic chain, insulator designs, current transformers (DT/DTC) and pre-insertion resistors (PIR) — are identical and based on decades of manufacturing and operating experience; the GIS switchgear range includes the same interrupter units, operating mechanisms and control elements. Construction types shown: 3AP1 FG up to 245 kV, 3AP1 FI up to 300 kV, 3AP2 FI up to 550 kV, 3AP1 DT up to 362 kV, 3AP1 DTC up to 245 kV and 3AP2/3 DT up to 550 kV. All construction types consist of the same basic components: 1. interrupter unit, 2. post insulator, 3. pillar, 4. control cabinet, 5. operating mechanism cubicle, 6. closing resistor.
The modular principle is encoded in the type designation (example 3AP1 FG): '3A' = three-pole outdoor circuit breaker; the following letter = name of the circuit breaker series (P, V, T); the digit = interrupter units per pole; F = spring / E = hydraulic operated mechanism; final letter G = 1 mechanism + 1 common base, E = 3 mechanisms + 1 common base, I = 3 mechanisms + 3 separate bases. Suffixes: DT = Dead Tank, DTC = Dead Tank Compact, DCB = Disconnecting Circuit Breaker.
The control system includes the secondary technical components required for operating the circuit breaker, mainly arranged in the control cabinet. Control, tripping, motor and heating power supplies can be selected by the customer; two standard control variants are available.
The basic variant includes all control and monitoring elements needed for operation: switching operation counter, 19 auxiliary switch contacts (9 normally open, 9 normally closed, 1 wiper contact) and local actuator. The compact variant adds spring monitoring by motor run time monitoring, heating monitoring (current measuring relay), light and socket attachment with a common circuit breaker to facilitate servicing, overvoltage attenuation, motor circuit breaker and heating circuit breaker. Special customer-adapted solutions can be offered on request.
Sensgear — born connected: with Sensgear the gas-insulated switchgear or circuit breakers transmit their current status in near-real time via an online application, going beyond common asset management to support active management of the grid. Beneficial applications include preventive detection of suspicious and critical assets, early warning with push notifications, reduced manhours and SF6 controlling at site, cost savings for unplanned SF6 leakage repairs, less risk contingencies and penalties for SF6 emissions, mechanical lifetime trending, fleet coverage in a unified manner, AI-powered analysis and comprehensive visualization tools.
Edgegear bridges on-premise and cloud: the Assetguard product family provides a full-fledged monitoring suite (partial discharge, circuit breaker and gas density monitoring) with IEC-standard interface; Edgegear operates offline and on demand online with cloud connection, with seamless integration to existing substation control systems / SCADA via IEC or DNP protocols.
Controlled switching with PSD (Point on Wave): energizing and re-energizing during autoreclosing of shunt-compensated transmission lines cause switching overvoltages. Conventional mitigations are closing resistors or surge arresters; PSD controlled switching can replace these devices and save costs. The design is based on more than 20 years of experience and covers capacitor bank and reactor switching, transformer energizing and uncompensated transmission lines up to 1100 kV; integration in the Siprotec 5 platform is also available.
Controlled contacts with SiCEA: the contact erosion analyzer determines contact wear from the breaking currents (calculated as the integral of the breaking currents; operations below rated normal current are evaluated with rated normal current). Warning and alarm limits adjustable in % of the maximum permissible contact wear allow servicing to be scheduled in good time, with digital relays and LEDs for warning and alarm and integrated-current calculation for three poles.
Vacuum interrupters form the backbone of the 3AV1 Blue portfolio. Based on more than 40 years of experience in the medium-voltage range and more than 6 million delivered vacuum interrupters, Siemens Energy introduced this proven technology to high-voltage power networks in 2010. Features: high reliability due to the hermetically tight vacuum interrupter, no toxic materials or decomposition products, perfect for low temperatures (no liquefaction of switching medium), high performance with low arc energy and very low erosion, no maintenance due to sealed-for-life technology, no greenhouse gas usage or emissions. The interrupter consists of an insulating envelope, fixed contact, movable contact and bellow; axial magnetic field (AMF) contacts — a technology established in vacuum interrupters for decades — confine the vacuum arc in a diffuse mode; at current zero the dielectric strength of the contact gap recovers and the arc is extinguished.
Clean air insulation — synthetic air composed of 80% N2 and 20% O2 — combines with vacuum switching as the Blue technology for F-gas-free power grids: no global warming potential (GWP = 0) or ozone depletion potential (ODP = 0), non-toxic and non-hazardous for health, safety and environment, no liquefaction in low-temperature applications (-60 °C to +55 °C), no extra costs for special tools, trainings or gas handling, no CO2 compensation fees and no gas recycling required. More than 2,500 global references with more than 700 F-gas-free devices in operation.
The conventional 3AP family relies on patented arc-quenching using the thermal energy of the arc: the self-compression principle for lower rated voltages and the dynamic self-compression principle for higher voltage levels. In the self-compression interrupter unit the current conducting path consists of the contact carrier, contact cylinder and moveable heating cylinder. During opening the main contact system opens first and the current commutates to the still-closed arcing contact (arcing pin and tube contact); the heating cylinder compresses the SF6 gas by the piston, creating a gas flow through the heating cylinder and nozzle that extinguishes the arc. With high short-circuit currents the gas is heated at the arcing contacts by the arc's energy, the pressure increase in the heating cylinder initiates the quenching gas flow — the interrupting energy comes from the arc itself, not from the operating mechanism.
The dynamic self-compression principle uses two-way moving contacts: the moving arcing pin is moved against the direction of the tube contact by the connected heating cylinder, nozzle, guide rail and cam lever, doubling the relative contact speed during opening. With large short-circuit currents the quenching gas around the moving pin is heated by the arc's energy and driven into the heating cylinder at high pressure; at current zero the gas flows back through the nozzle and quenches the arc, with a valve plate preventing the high pressure from entering the compression chamber.
The drive concept of the 3AP circuit breaker family is based on the patented stored-energy spring principle and is identical on all types. Use of this operating mechanism for voltage ranges up to 1100 kV became appropriate through the development of a self-compression interrupter unit that requires minimal actuating energy; the compact design allows the stored-energy spring mechanism to be placed within the control cubicle. Both closing and opening springs are located inside the operating mechanism — a simple, sturdy device with few moving parts, roller bearings, a maintenance-free charging mechanism, vibration-isolated latches and load-free isolation of the charging mechanism. Main parts: switching rod, trip coil CLOSE, charging gear, opening latch, connecting rods for opening and closing springs, trip coil OPEN, opening spring, closing spring.
Advantages: same principle for rated voltages from 72.5 kV up to 1100 kV; high reliability thanks to low operating energy (10,000 operating cycles guaranteed); fail-safe, economical and persistent due to uncomplicated, robust construction; controllable switching state at all times; easy access to springs as they are not integrated in SF6 compartments; maintenance-free for 25 years or 10,000 operation cycles; low environmental impact compared to former drive systems.
Development and type testing: switching performance, high-voltage stability and performance under mechanical loads (wind, short circuits) and seismic conditions are simulated and optimized using digital twins. All circuit breakers are completely type-tested to the latest IEC, ANSI and other standards before market launch. The Berlin lead factory hosts laboratories accredited to IEC 17025, part of the European PEHLA network of independent testing organizations and a member lab of the Short-Circuit Testing Liaison (STL); facilities include basic research and vacuum switching, high-voltage, high-power, mechanical and temperature-rise testing laboratories. Routine testing is performed on every assembled circuit breaker (mechanical operations, closing/opening times, release and motor currents, gas monitoring, control-circuit testing, voltage drop of the main conducting path, high-voltage testing, testing of auxiliary circuits). IEC specifies an annual maximum SF6 leakage rate of 0.5%; decades of operational experience show Siemens Energy circuit breakers stay below even 0.1% per year.
Installation and commissioning: breakers for 72.5 kV to 300 kV can be transported fully pre-assembled and routine-tested; higher ratings ship as compact subassemblies. A single supervisor can install one circuit breaker within one and a half days, and because routine testing is done in the factory, commissioning is reduced to a minimum with no special tools required. The first inspection of the 3AP family is necessary after 12 years or 3,000 operation cycles, first maintenance is recommended after 25 years or 6,000 operation cycles, and the CO2-neutral 3AV1 Blue products are maintenance-free even up to 10,000 operation cycles. Maintenance kits are available for a minimum of 25 years after delivery, backed by worldwide round-the-clock customer support.
Vacuum technology is the game changer for F-gas-free high-voltage power grids. The 3AV1 Blue live tank breaker is designed on the same modular platform concept as the SF6 portfolio and offers features superior to SF6 circuit breakers: 30 full short-circuit current interruptions, 10,000 rated current interruptions, optional 2-cycle current interruption, full performance down to -60 °C ambient temperature and a maintenance-free interrupter unit during its lifetime. Zero greenhouse gases: greenhouse- and F-gas-free insulation, no CO2 emissions, no F-gas-regulated reporting or density checks, no toxic insulation gas and no special safety measures. The world's first substation with SF6-free switchgear technology from Siemens Energy went into a 110 kV high-voltage grid (Noerdlingen, Germany, 2018).
The catalog's comparison table (transcribed verbatim below) sets the 3AV1 Blue 145 kV against a same-class SF6 breaker. All values in accordance with IEC; other values on request. *On request available as 145 kV 60 Hz circuit switcher in accordance with IEEE / ANSI.
| Parameter | 3AV1 Blue 145 kV* | vs. SF6 CB 145 kV |
|---|---|---|
| No. of operations at rated short-circuit breaking current (40 kA) | 30 | 10-12 |
| No. of interrupter units per pole | 1 | 1 |
| No. of operations at rated normal current (3,150 A) | 10,000 | 6,000 |
| Rated break time | 3 cycles and 2 cycles | 3 cycles |
| Rated normal current, up to | 3,150 A | 3,150 A |
| Rated short-time withstand current, up to | 40 kA | 40 kA |
| Rated short-circuit breaking current, up to | 40 kA | 40 kA |
| Rated frequency | 50 / 60 Hz | 50 / 60 Hz |
| Rated power-frequency withstand voltage | 275 kV | 275 kV |
| Rated lightning impulse withstand voltage | 650 kV | 650 kV |
| Rated duration of short-circuit | 3 s | 3 s |
| Rated peak withstand current (2.7 p.u.) | 108 kA | 108 kA |
| First-pole-to-clear factor | 1.5 / 1.3 p.u. | 1.5 / 1.3 p.u. |
| Capacitive voltage factor | 1.4 p.u. | 1.4 p.u. |
| Temperature range | -60 up to +55 °C | -30 up to +55 °C |
| Maintenance schedule | 12 years: visual inspection and checks; up to 10,000 operations at 3,150 A | 12 years: visual inspection and checks; 25 years: maintenance; up to 6,000 operations at 3,150 A |
| Insulating medium | clean air | SF6 |
| Mass of fluorinated greenhouse gases / mass of CO2 equivalent | 0 kg / 0 t | 6.4 kg / 150 t |
In live tank breakers the interrupter unit is not grounded during operation; it is exposed to high-voltage potential. The 3AP family is available for rated voltages from 72.5 kV up to 1100 kV: 3AP1 breakers up to 300 kV carry one interrupter unit per pole, 3AP2 breakers up to 550 kV carry two, and for 362-550 kV applications optional closing resistors are available (3AP3). For higher voltage levels the 3AP4 includes 4 interrupter units per pole and can also be delivered with closing resistors on request (3AP5). Pole arrangements: three-pole operation with common base (FG), single-pole operation with common base (FE) or one pole per separate base (FI). All 3AP live tank breakers use the stored-energy spring drive mechanism and self-compression interrupter units, with particularly strong insulators and a design optimized for very high seismic stability.
Platform table transcribed verbatim from the catalog (this 2022 edition tabulates up to 800 kV). Columns group as 3AP1 (72.5-300 kV, 1 interrupter unit), 3AP2/3 (420-550 kV, 2 units), 3AP4/5 (800 kV, 4 units); values the catalog prints once across a merged span are repeated in each covered column, and cells the catalog leaves blank are left empty. All values in accordance with IEC, other values on request. *Limited normal current rating at more than +40 °C.
| Parameter | Unit | 3AP1 72.5 | 3AP1 123 | 3AP1 145 | 3AP1 170 | 3AP1 245 | 3AP1 300 | 3AP2/3 420 | 3AP2/3 550 | 3AP4/5 800 |
|---|---|---|---|---|---|---|---|---|---|---|
| Rated voltage | kV | 72.5 | 123 | 145 | 170 | 245 | 300 | 420 | 550 | 800 |
| No. of interrupter units per pole | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 4 | |
| Rated short-duration power-frequency withstand voltage | kV | 140 | 220 | 275 | 325 | 460 | 460 | 610 | 800 | 830 |
| Rated lightning impulse withstand voltage / min | kV | 325 | 550 | 650 | 750 | 1050 | 1050 | 1425 | 1550 | 2100 |
| Rated switching impulse withstand voltage | kV | 850 | 1050 | 1175 | 1425 | |||||
| Rated normal current, up to | A | 2500 | 4000 | 4000 | 5000 | 5000 | 5000 | 5000 | 5000 | 5000 |
| Rated short-time withstand current (1 s - 3 s), up to | kA | 40 | 40 | 40 | 63 | 63 | 63 | 80 | 63 | 63 |
| Temperature range | °C | -60 up to +55* | -60 up to +55* | -60 up to +55* | -60 up to +55* | -60 up to +55* | -60 up to +55* | -60 up to +55* | -60 up to +55* | -60 up to +55* |
| Rated operating sequence | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | |
| Rated break time | 3 cycles | 3 cycles | 3 cycles | 3 cycles | 2 cycles | 2 cycles | 2 cycles | 2 cycles | 2 cycles | |
| Rated frequency | Hz | 50 or 60 | 50 or 60 | 50 or 60 | 50 or 60 | 50 or 60 | 50 or 60 | 50 or 60 | 50 or 60 | 50 or 60 |
| Maintenance after | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years |
The 3AV1 DT is the world's first climate-neutral 123 kV dead tank breaker, fully type tested according to IEEE and ANSI standards, first installed at a pilot installation in California. The Blue dead tank breakers offer rated voltages up to 145 kV, rated short-circuit breaking current up to 63 kA and rated current up to 3,150 A, with the same footprint as the SF6 product (dimensions and connections) and lowest-temperature applications without heating systems.
Table transcribed verbatim; values the catalog prints once across both columns are repeated in each. All values in accordance with IEEE/ANSI; other values on request. *Available in 2022.
| Parameter | Unit | 3AV1 DT 123 kV | 3AV1 DT 145 kV |
|---|---|---|---|
| Rated voltage | kV | 123 | 145 |
| No. of operation at rated short-circuit breaking current | 30 | 30 | |
| No. of interrupter units per pole | 1 | 1 | |
| Rated normal current, up to | A | 3150 | 3150 |
| Rated break time | 2 and 3 cycles | 2 and 3 cycles | |
| Rated short-time withstand current (1 s - 3 s), up to | kA | 40 / 63* | 40 / 63* |
| Rated frequency | Hz | 50 / 60 | 50 / 60 |
| Rated short-duration power-frequency withstand voltage | kV | 260 | 275 |
| Rated lightning impulse withstand voltage / min | kV | 550 | 650 |
| Rated duration of short circuit | s | 3 | 3 |
| Rated peak withstand current (2.7 p.u.) | kA | 108 | 108 |
| First pole to clear factor | 1.5 / 1.3 p.u. | 1.5 / 1.3 p.u. | |
| Capacitive voltage factor | 1.4 p.u. | 1.4 p.u. | |
| Rated switching impulse withstand voltage | kV | 710 | 838 |
| Temperature range | °C | -60 up to +50 | -60 up to +50 |
| Rated operating sequence | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | |
| Maintenance after | 12 years / 7000 operations | 12 years / 10,000 operations | |
| Insulating medium | clean air | clean air | |
| Mass of F-gas | 0 | 0 |
Dead tanks have a metal-enclosed interrupter unit with the housing always grounded. They offer particular advantages where the protection design requires several current transformers per pole assembly: toroidal-core current transformers on the bushings (compact construction), high short-circuit breaking currents (up to 90 kA with one interrupter unit), low center of gravity (higher seismic withstand capability), gas mixture or heating system for lowest-temperature applications, and gas-insulated components for highest availability with minimum maintenance. Bushing current transformers for measurement or protection to IEC/ANSI mount in weatherproof housings on both sides of each pole, with up to three current transformers per bushing in the standard housing; extra-strong porcelain bushings give very high seismic stability, and the breaker covers -60 °C to +55 °C with pure SF6.
Table transcribed verbatim; merged spans repeated per covered column, blank catalog cells left empty. All values in accordance with IEC, other values on request. 362 kV and 550 kV available with pre-insertion resistor (PIR). *Limited normal current rating at more than +40 °C.
| Parameter | Unit | 3AP1 72.5 | 3AP1 123 | 3AP1 145 | 3AP1 245 | 3AP1 362 | 3AP2/3 362 | 3AP2/3 550 |
|---|---|---|---|---|---|---|---|---|
| Rated voltage | kV | 72.5 | 123 | 145 | 245 | 362 | 362 | 550 |
| No. of interrupter units per pole | 1 | 1 | 1 | 1 | 1 | 2 | 2 | |
| Rated short-duration power-frequency withstand voltage | kV | 140 | 230 | 275 | 460 | 520 | 520 | 800 |
| Rated lightning impulse withstand voltage / min | kV | 325 | 550 | 650 | 1050 | 1380 | 1380 | 1865 |
| Rated switching impulse withstand voltage | kV | 950 | 950 | 1175 | ||||
| Rated normal current, up to | A | 3150 | 3150 | 3150 | 4000 | 5000 | 4000 | 4000 |
| Rated short-time withstand current (1 s - 3 s), up to | kA | 40 | 40 | 63 | 90 | 63 | 80 | 63 |
| Temperature range | °C | -60 up to +55* | -60 up to +55* | -60 up to +55* | -60 up to +55* | -60 up to +55* | -60 up to +55* | -60 up to +55* |
| Rated operating sequence | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | |
| Rated break time | 2 cycles or 3 cycles | 2 cycles or 3 cycles | 2 cycles or 3 cycles | 2 cycles or 3 cycles | 2 cycles or 3 cycles | 2 cycles or 3 cycles | 2 cycles or 3 cycles | |
| Rated frequency | Hz | 50 or 60 | 50 or 60 | 50 or 60 | 50 or 60 | 50 or 60 | 50 or 60 | 50 or 60 |
| Maintenance after | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years |
The 3AP1 Dead Tank Compact (DTC) is a hybrid concept combining SF6-encapsulated components and air-insulated devices. Gas-insulated components increase availability — according to CIGRE analyses they are four times more reliable than air-insulated components — and safety can be enhanced by separating gas compartments between circuit breaker and disconnector. The DTC is a compact arrangement of a dead tank circuit breaker fitted with one or two current transformers, one or more disconnectors, earthing switches and bushings for bus bar connection; core components are adopted from the high-voltage circuit breaker, disconnector and GIS product families, so different layouts can be realized with minimum engineering effort. Flexible options: one- or three-pole operating mechanism, disconnector / earthing switch / high-speed earthing switch, current transformer, voltage transformer and voltage detection system, cable connections at various positions, porcelain or composite bushings, additional gas-compartment separation with SF6 density monitor on request, double breaker modules for ultra-compact substations, and stand-alone components such as a disconnector module with voltage transformer.
Table transcribed verbatim: the catalog prints the 'Rated switching impulse withstand voltage' row with unit kV but no values for the DTC — those cells are left empty here. All values in accordance with IEC, other values on request. *Limited normal current rating at more than +40 °C.
| Parameter | Unit | 3AP1 DTC 145 | 3AP1 DTC 245 |
|---|---|---|---|
| Rated voltage | kV | 145 | 245 |
| No. of interrupter units per pole | 1 | 1 | |
| Rated short-duration power-frequency withstand voltage | kV | 275 | 460 |
| Rated lightning impulse withstand voltage / min | kV | 650 | 1050 |
| Rated switching impulse withstand voltage | kV | ||
| Rated normal current, up to | A | 3150 | 4000 |
| Rated short-time withstand current (1 s - 3 s), up to | kA | 40 | 63 |
| Temperature range | °C | -55 up to +55* | -55 up to +55* |
| Rated operating sequence | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | |
| Rated break time | 3 cycles | 3 cycles | |
| Rated frequency | Hz | 50 or 60 | 50 or 60 |
| Maintenance after | 25 years | 25 years |
The DCB integrates the isolating distance into the SF6 gas compartment: one device serving as circuit breaker and disconnector, developed on the basis of a higher-rated standard 3AP circuit breaker to provide the required higher dielectric properties. A thoroughly verified mechanical interlock guarantees the breaker remains open when used as a disconnector — when activated it is impossible to close the breaker — and the DCB status is monitored electrically with clearly visible position indicators. Up to 145 kV an additional air-insulated earthing switch with the maintenance-free Ruhrtal-design contact system can be mounted on the supporting structure. The disconnecting circuit breakers are type-tested according to class M2 and C2 of IEC 62271-108, the specific standard for combined switching devices. Advantages: highest reliability from well-proven components, highest availability through reduced maintenance interruptions, cost and space savings by combining two functions in one device, minimized civil engineering, and a compact intelligent interlocking and position indicating device.
Table transcribed verbatim; the blank switching-impulse cell for the 145 kV column is left empty as printed. All values in accordance with IEC, other values on request. *Limited normal current rating at more than +40 °C.
| Parameter | Unit | 3AP1 DCB 145 kV | 3AP2 DCB 420 kV |
|---|---|---|---|
| Rated voltage | kV | 145 | 420 |
| No. of interrupter units per pole | 1 | 2 | |
| Rated short-duration power-frequency withstand voltage | kV | 275 or 315 | 520 or 610 |
| Rated lightning impulse withstand voltage / min | kV | 650 or 750 | 1425 or 1665 |
| Rated switching impulse withstand voltage | kV | 1050 or 1245 | |
| Rated normal current, up to | A | 3150 | 4000 |
| Rated short-time withstand current (1 s - 3 s), up to | kA | 31.5 | 50 |
| Temperature range | °C | -40 up to +40* | -50 up to +40* |
| Rated operating sequence | O-0.3 s-CO-3 min-CO or CO-15 s-CO | O-0.3 s-CO-3 min-CO or CO-15 s-CO | |
| Rated break time | 3 cycles | 3 cycles | |
| Rated frequency | Hz | 50 or 60 | 50 or 60 |
| Maintenance after | 25 years | 25 years | |
| Insulating medium | SF6 | SF6 |
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