Capacitors Capacitor
Todays deals on Capacitors Capacitor?
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IET / General Radio 1408 Air Bath Reference Standard Capacitor $17,995.00 |
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Capacitor Bank 480V 3Ph, 60Hz, 50Kvar Mfg: ABB, NEW, Complete Specs Available $5,500.00 |
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1pF-1mkF 0.05% Capacitor standard capacitance P597 set of 18psc an-g GenRad, IET $2,660.00 |
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10pF-1mF 0,5% 10kV Decade capacitance bridge,capacitor P5026 an-g Gen.Rad.,IET $4,260.00 |
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10Kx SIEMENS B33063 18700PF +/-2% 160V P CAPACITOR $4,500.00 |
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CAPACITOR * MX-6066 / ARC-105 522-3336-005 (Rockwell) $4,500.00 |
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TFMFO-0K90-1208BMD CAPACITORS Plastic dielectric LOT $4,000.00 |
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10Kx SIEMENS B33063 27000PF +/-2.5% 160 V P CAPACITOR $3,800.00 |
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AUTOVAR POWER CAPACITOR BANK CAT.#300PCSE43IEFILPX2 $3,500.00 |
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Eldre ECI-17690 High Voltage System w/ 24 qty Philips A21509-532-0 $3,395.75 |
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INDRAMAT AC SERVO CAPACITOR TCM 2.1-02-7 $3,150.00 |
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10000x SIEMENS B33063 4640 PF +/-2.5% 160V P CAPACITOR $3,200.00 |
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10000x SIEMENS B33063 2000 PF +/-2.5% 160V P CAPACITOR $3,000.00 |
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General Radio 1422-MD Precision Capacitor 1050 & 105 pF $2,999.95 |
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10000x SIEMENS B33063 5620 PF +/-2% 160 V P CAPACITOR $2,900.00 |
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10000x SIEMENS B33063 4700 PF +/-2.5% 160V P CAPACITOR $2,850.00 |
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10Kx MiaL 611-3 4700PF +/-3% 160 V PP CAPACITOR AXIAL $2,800.00 |
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ESI SC1000 Standard Capacitor 1 NanoFarad Calibrator *Tested* $1,972.79 |
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2GHZ POWER AMPLIFIER 1.7-1.9 GHZ 5 WATT HARRIS SD-97882 24 VOLTS $275.00 |
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2000 x 30kV 470pF High Voltage Ceramic Disc Capacitor $2,098.60 |
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ALLEN BRADLEY BRIDGE FAN & CAPACITOR 2361-SPH01B *NSFP* $1,999.00 |
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200X 47uF 50V 105℃ Capacitor容74 FIT AOC SONY VIZIO RCA TOSHIBA AKAI PANASONIC TV $19.99 |
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10000x SIEMENS B33063 1000 PF +/-2.5% 160V P CAPACITOR $1,950.00 |
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10K SETxTOZAI IS-3MP MICA+BUSH F-UL INSULATOR FOR TO-3P $1,950.00 |
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10Kx MiaL 611-3 3900PF +/-10% 160 V PP CAPACITOR AXIAL $1,800.00 |
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10KSETxNEC SK-16B MICA+NEC YC-20A INSULATOR FOR TO-220 $1,800.00 |
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10000 PCS 10UF 16V B 3528-21 SMD Tantalum capacitor 106 $1,799.99 |
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LOT 21k NICHICON VX(M) 100uF 63V Electrolytic Capacitor $1,799.99 |
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INDRAMAT AC SERVO CAPACITOR-TCM TCM1.1-08-W0 $1,700.00 |
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10K SETx BERGQUIST K4-05 SIL P+BUSH F-UL TO-3 INSULATOR $1,750.00 |
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0.1nF-111mkF 0.1% Decade capacitance box capacitor standard P5025 an-g GR,IET $1,070.00 |
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6700x SPRAGUE 10UF 16VDC 20% TANTALUM CAPACITOR RADIAL $1,675.00 |
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NEW ALUM ELECT CAPACITORS SCREW TERMINAL 80V 22000uF LNR1K223MSM NICHICON JAPAN $1,600.00 |
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New Maxwell UltraCapacitor 48V165F Super Ultra Capacitor BMOD 0165 P048 B01 Cap $1,500.00 |
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RIIMIC SUNAIR VARIABLE CAPACITOR 6035080707 JENNINGS $1,500.00 |
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2 x Comet Pressure Fixed Vacuum Capacitor CF1C-450E/25 450pF 25kV / 15kV $1,311.90 |
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Drytek 384T Rf Automatch Network P/N 600768 $1,475.00 |
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500,NEW 18X43 450V 100UF Axial Electrolytic Capacitor $1,458.00 |
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BOSCH POWER SUPPLY (CAPACITOR BANG) KM 2200-T $1,350.00 |
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10000xTOZAI IS-3MP 407 MICA INSULATOR FOR TO-3P/TO-247 $1,390.00 |
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SIEMENS C98043-A7001-L1 6RA70 CONTROL BOARD NEW $1,400.00 |
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Allen Bradley 150-a180nbd 150hp w/ overload ,capacitor $1,260.00 |
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OFFER & WIN CONDENSER CAPACITOR RF 4500 FGL 68-110 UN14KV $1,300.00 |
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GE Fanuc A06B-6083-H218 CAPACITOR MOD $1,299.00 |
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10000SETx TOZAI IS-313B+ BUSH F-UL TO-220 INSULATOR $1,290.00 |
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50 pF 0.08% 10kV Air Capacitor standard capacitance P5023 New an-g General Radio $930.00 |
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JENSEN 0.47uF 1000V Hi-end Audio Pure Silver Foil Paper in oil Pair Capacitors $1,269.00 |
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F931C226KCC nichicon tantalum chip capacitor $1,250.00 |
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300p Marcon 63V 15000UF Electrolytic Capacitor 35X51NEW $1,228.00 |
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300p Marcon 63V 15000UF Electrolytic Capacitor 35X51NEW $1,228.00 |
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300p Marcon 63V 15000UF Electrolytic Capacitor 35X51NEW $1,228.00 |
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300p Marcon 63V 15000UF Electrolytic Capacitor 35X51NEW $1,228.00 |
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NEW KEMET Part# T340C475K040AS7301 Capacitor 1K PC REEL $1,199.00 |
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10000 AVX TPSR106M006S1000 CAPACITOR TANT 10UF 6.3V 1OH $1,199.99 |
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General Electric 17L641TH Capacitor NEW $1,212.77 |
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1000 x 30kV 470pF High Voltage Ceramic Disc Capacitor $1,199.20 |
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4000 – C1206C102F1GAC 100v 1000pF C0G 1% Capacitor Rohs $1,199.00 |
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Automatic Bulk capacitor cutting machine $995.00 |
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Tek and Metal Clad Connectors-OZ Gedney-JMC-50-99 $1,061.01 |
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10KxMURATA DE1110-834 MX601M 600PF 125VAC 20% CAPACITOR $1,100.00 |
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KEMET T340B155M035AS7301 Capacitor 1533 pc Lot – NEW $1,100.00 |
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SIEMENS 6SL3352-6BE00-0AA0 Free Shipping worldwide $1,100.00 |
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LOT OF 449 Murata p/n RPER72A105K6B1F03B Factory Sealed $1,050.66 |
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10000x NEC SK-16B MICA INSULATOR FOR TO-220/202/126 $1,050.00 |
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Comet CV05C-1000UC/5 & CV05C-500UC/8 Dressler VM 1500 $989.00 |
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GR General Radio 1412-BC decade capacitor, NIST-cal’d $995.00 |
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CUTLER HAMMER WESTINGHOUSE 2D66818H01 PCB $999.99 |
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KEMET Part# T340C685M035AS7301 Capacitor 1000 pc Reel $999.00 |
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NEW KEMET Part# T340C475K040AS7301 Capacitor 823 PCS $999.00 |
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LCD TV USE 820uF 35V 105℃ 10 pcs Capacitor $10.49 |
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Lot of Panasonic Digi-Key Capacitors Over 125 Pieces $999.00 |
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AVX CK06BX105K, 1.0uF, ±10%, 50V, capacitors, lot/1000 $999.95 |
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GENRAD 1409-G STANDARD CAPACITOR GENERAL RADIO 0.002 0.1% $995.00 |
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GENRAD 1409-F STANDARD CAPACITOR GENERAL RADIO 0.001 0.05% 500V MAX $995.00 |
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GENRAD 1409-T STANDARD CAPACITOR GENERAL RADIO 0.1 0.05% 500V MAX $995.00 |
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Pulse Capacitor $1,000.00 |
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ABB POWERIT POWER FACTOR CONTROLLER RVT-12 $999.99 |
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GE Capacitor 54L502WC29043 DIELEKTROL VIIA 2770V 1PH 150kVAr $949.00 |
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High Energy Corp HEC PWC18762MA Tank Capacitor $899.00 |
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1000uf /35 V / 105C capacitors, 30pcs $919.08 |
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NEW ALSTOM NOVAR 305 N305T4805VNLBAA CAPACITOR CONTROLLER $900.00 |
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Comet Pressure Fixed Vacuum Capacitor CF1C-350E/25 350pF 25kV / 15kV $837.69 |
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Lot of 5650 NOVACAP 1210Z334Z250NTM 330nF Capacitor $904.00 |
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Variable capacitor 50-2300 pf 15 kV Jennings made in USA $850.00 |
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Variable capacitor 55-2300 pf 15 kV Jennings made in USA $850.00 |
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TH2617B Capacitor Capacitance Tester Meter 100KHz 0.1% $899.99 |
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TH2617B Capacitor Capacitance Tester Meter 100KHz 0.1% $899.99 |
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1000 ELUM 33uF 450V AXIAL DL-8 Electrolytic Capacitor $890.00 |
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1000 ELUM 33uF 450V AXIAL DL-8 Electrolytic Capacitor $890.00 |
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TH2617B Capacitor Capacitance Tester Meter 100KHz 0.1% $888.00 |
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POWERTEC 141-106 CAPACITOR BOARD ***XLNT*** $870.00 |
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Panasonic Capacitor P/N EEVFC1H221P LOT of 6990 Pieces $838.80 |
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High Voltage Capacitor 0.23-0.0026 mF 18000VDCW $800.00 |
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Lot of 10000 ECEV1CA220SR 22UF,16V,20%,SMT CAPACITOR $800.00 |
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Fixed Electrolytic Capacitor, Part Number: CE71C102P- LOT OF (10) TEN $795.00 |
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Trench CPR 04 Capacitor Protection Relay CPR04-00-110 New no box $799.00 |
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New 1000 Pcs. of 1uF 250V Radial Mylar Film Capacitors Nichicon $820.00 |
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General Radio GenRad GR 1403 K N R G D A Standard Air Capacitor Set $795.00 |
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INDUCTOHEAT CAPACITOR 10310-027 NEW 10310027 $800.00 |
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200 Marcon 63V 15000UF Electrolytic Capacitor 35X51 NEW $815.00 |
Capacitors Capacitor Questions
Super Capacitors
One of the most critical aspects of an uninterruptible power supply (UPS) is its standby or back-up battery system, where super capacitors are now beginning to play a role.
A super capacitor resembles a regular capacitor except that it offers high capacitance in a small package. Energy storage is by means of static charge rather than an electro-chemical process, inherent in lead-acid uninterruptible power supply batteries. Applying a voltage differential on the positive and negative plates charges the super capacitor (this concept is similar to an electrical charge that builds up when walking on a carpet).
Their design makes them ideal for small uninterruptible power supply installations whereby they are being utilised in favour of a battery set or to reduce the potential for battery discharge during momentary mains power failures.
The amount of energy that can be stored depends upon the active material used in the design of a super capacitor. Potentially, it can achieve up to 30kW of stored energy.
A super capacitor (also referred to as electric double layer capacitor, electrochemical double layer capacitor or ultra capacitor) consists of two electrodes constructed from a highly activated carbon material, which may be woven. Whereas a regular capacitor consists of conductive foils and a dry separator, the super capacitor crosses into battery technology by using special electrodes and some electrolyte. There are three types of electrode materials suitable for the super capacitor: high surface area activated carbons, metal oxide and conducting polymers. The high surface electrode material, also called Double Layer Capacitor (DLC), is least costly to manufacture and is the most common. It stores the energy in the double layer formed near the carbon electrode surface.
The carbon activated electrodes provide a large reticulated area upon which an active material such as Ruthenium Oxide is deposited. The material provides an enormous area, for example, 1000 square meters per gram of material used. Cellulose paper with polymeric fibers to provide reinforcement is typically used as the separator between the electrodes. Electrolyte is usually diluted Sulphuric Acid. Ruthenium Oxide is converted into Ruthenium Hydroxide by a chemical reaction and this enables energy to be stored.
To operate at higher voltages, super capacitors are connected in series. On a string of more than three capacitors, voltage balancing is required to prevent any cell from reaching over-voltage.
Energy within a super capacitor is quickly available – and this is one of its greatest advantages. When coupled to an existing battery set, they can inhibit battery cycling for momentary interruptions, which helps extend the working life of the set. A super capacitor’s working life is typically ten years (double that of an average UPS battery). They can also operate over a wide temperature range (minus 30 to 45 degrees centigrade).
Other Advantages
- Virtually unlimited cycle life – can be cycled millions of times.
- Low impedance – enhances load handling when put in paralleled with a battery.
- Rapid charging –super capacitors charge in seconds.
- Simple charge methods – no full-charge detection is needed; no danger of overcharge.
Limitations
- Linear discharge voltage prevents use of the full energy spectrum.
- Low energy density – typically holds one-fifth to one-tenth the energy of an electrochemical battery.
- Cells have low voltages – serial connections are needed to obtain higher voltages. Voltage balancing is required if more than three capacitors are connected in series.
- High self-discharge – the rate is considerably higher than that of an electrochemical battery.
Whereas the electro-chemical battery delivers a steady voltage in the usable energy spectrum, the voltage of the super capacitor is linear and drops evenly from full voltage to zero volts. Because of this, it is unable to deliver the full charge. If, for example, a 6V battery is allowed to discharge to 4.5V before the equipment cuts off, the super capacitor reaches that threshold within the first quarter of the discharge cycle. The remaining energy slips into an unusable voltage range. A DC-to-DC converter could correct this problem but such a regulator would add costs and introduce a 10 to 15 percent efficiency loss.
The charge time of a super capacitor is about 10 seconds. The ability to absorb energy is, to a large extent, limited by the size of the charger. The charge characteristics are similar to those of an electrochemical battery. The initial charge is very rapid; the topping charge takes extra time. Provision must be made to limit current when charging an empty super capacitor.
In terms of charging method, the super capacitor resembles the lead-acid battery. Full charge occurs when a set voltage limit is reached. But unlike the electrochemical battery, the super capacitor does not require a full-charge detection circuit. Super capacitors take as much energy as needed. When full, they stop accepting charge. There is no danger of overcharge or ‘memory’.
Super capacitors are relatively expensive in terms of cost per watt. Some design engineers argue that the money would be better spent providing a larger battery by adding extra cells. But the super capacitor and chemical battery are not necessarily in competition. They enhance one another.
About the Author
Robin Koffler is the General Manager for Riello UPS Ltd the UK subsidiary of Riello UPS (RPS S.p.A) a leading European manufacturer of Uninterruptible Power Supplies and a co-author of The Power Protection Guide(ISBN 978-0-9554428-0-3)- available from Amazon.com
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