Global one-stop procurement platform for industrial spare parts.
support01@okmarts.com service@okmarts.com hydraulic@okmarts.com
Okmarts.com Online Store, Refrigeration Compressor Price, O&Kmarts Logo
Max 200 characters
Display the website inEN
EN
translate to EN
EN
translate to ES
ES
translate to العربية
العربية
All
VACON
VACON
  • VFD
    VFD
Inovance
Inovance
  • HMI
    HMI
  • VFD
    VFD
  • Memory Cards & Readers
    Memory Cards & Readers
Fuji
Fuji
  • HMI
    HMI
  • VFD
    VFD
  • Transmitter
    Transmitter
  • Circuit Breaker
    Circuit Breaker
  • PLC
    PLC
  • Contactor
    Contactor
  • Surge Protection Device
    Surge Protection Device
  • Industrial Belt
    Industrial Belt
  • Flowmeter
    Flowmeter
  • Fuse
    Fuse
  • Fan
    Fan
  • Relay
    Relay
  • Power Supply
    Power Supply
  • Battery
    Battery
Panasonic
Panasonic
  • Refrigeration Compressors
    Refrigeration Compressors
  • HMI
    HMI
  • Light Curtain
    Light Curtain
  • VFD
    VFD
  • Sensor
    Sensor
  • Gearbox
    Gearbox
  • Contactor
    Contactor
  • PLC
    PLC
  • Electric Motor
    Electric Motor
  • Flowmeter
    Flowmeter
  • Temperature Controller
    Temperature Controller
  • Relay
    Relay
  • Module
    Module
  • Industrial Heater
    Industrial Heater
  • Expansion Valve Coil
    Expansion Valve Coil
  • Resistor
    Resistor
  • Battery
    Battery
  • IC
    IC
  • Air Conditioner
    Air Conditioner
  • Servo Drive
    Servo Drive
  • Servo Motor
    Servo Motor
  • Fan
    Fan
Yaskawa
Yaskawa
  • Encoder
    Encoder
  • VFD
    VFD
  • PLC
    PLC
  • Servo Drive
    Servo Drive
INVT
INVT
  • VFD
    VFD
All Brands
All Brands
    • a
    • b
    • c
    • d
    • e
    • f
    • g
    • h
    • i
    • j
    • k
    • l
    • m
    • n
    • o
    • p
    • q
    • r
    • s
    • t
    • u
    • v
    • w
    • x
    • y
    • z
    • 3
    • 7
      Top Picks
      • Lenze VFD Frequency Converter E82CV551K4C
      1/1
      Lenze VFD Frequency Converter E82CV551K4C
      $ 584 .68

      ✔ In Stock (Can ship in 5-7 days)

      Quantity
      MOQ : 1
      Payment Methods
      T/T pay VISA pay mastercard pay Diners Club pay Discover pay JCB pay American Express pay Stripe pay PayPal pay Google pay Apple pay Link pay venmo pay
      • Online Support 24/7

      • 12 Months Warranty for New Products

      • 30 Days Money Back Guarantee

      • Specifications
      • Q&A
      • Reviews
      The Lenze Frequency Converter VFD is high quality!

      We can also provide the following models
      E94ASSE0094D33EO
      Z25ED0BTC0L255F00S
      ESV271N04YXE
      I95AE255C1A0100320
      ESV222E06SMD
      E84DHMBC7514G8SLNN
      I95AE330F1A0001230
      E94AMHE2024F11DN
      I55AP155G1A50000LS
      I95AE345C1AV00533R
      ESV112C4SMF
      I95AE411C1AV10433R
      I95AE322F1AV00300R
      I95AE240D1AV10422T
      I95AE322D1A0106200
      I95AE155C1AV103320
      E94ASHE0324F11ET
      ESV152P6TXC
      ESV751P02SLC
      I95AE215F1AV10Z22R
      I55AP137B2A500002S
      ESV112E2TFC
      I95AE240D1C010300G
      I95AE411C1CV10Z22R
      ESV552R04SLC
      E84AVSCE7512VB0
      I95AE411F1CV00622T
      ESV223N1TLC
      ESV183P6YLD
      I95AE330D1C010Z300
      I95AE175C1C01063QT
      I95AE330D1A010Z20G
      I95AE411D1AV0012Q0
      I95AE222F1C010523T
      I95AE322C1CV100020
      ESV552P01TMC
      I95AE330C1C000223R
      I95AE375F1CV10Z03T
      ESV552D01TMB
      I95AE275C1CV00Z0QG
      I95AE330C1AV1023QR
      ESV153R2TLD
      I95AE275F1A010Z220
      I95AE275F1C000000R
      I95AE330C1A000002T
      ESV251E6SXC
      I95AE315F1CV00100T
      I95AE315F1C000233G
      I95AE355D1AV1063QR
      I95AE222F1A000Z2QG
      I95AE375C1CV004020
      I95AE375F1C000330T
      I95AE255D1CV10Z20R
      ESV222E01YME
      I95AE311F1CV10402R
      ESV402N04YMC
      I95AE411D1CV00Z02T
      I95AE311D1AV10422R
      I95AE275C1CV00Z03G
      ESV453P06SXC
      ESV402E06SLC
      I95AE137C1C000130G
      I95AE240C1A00040QT
      I95AE411F1C0001220
      I95AE345D1AV00420R
      E84DHPFC7514C7SKNE
      I95AE411D1AV00502T
      I95AE155F1C010Z03G
      ESV113D04YFE
      E84AVHCD3712SBS
      I55AP222G0A710006S
      I95AE322C1C000403T
      I55AE230A10V11001S
      I95AE411D1AV10620R
      ESV271C6TFE
      ESV271N06YMF
      I95AE411D1C010220R
      ESV251E02SXB
      I55AP137C0A71100MS
      I95AE155C1CV10602G
      I95AE137D1A01013Q0
      E84AVHCE1132VXS
      I95AE222D1C010520R
      I95AE411F1CV0060QG
      I95AE345D1A010333T
      I95AE275C1CV00Z0QT
      ESV453P04SMF
      I95AE255D1C0101320
      I95AE222D1AV1002QT
      I95AE240C1CV10503T
      I95AE222F1C010632R
      I51AE215D10V00000S
      E94AMSE0044F43EO
      I95AE315D1A010320T
      ESV222N04TXB
      I95AE375C1AV0013QG
      I55AE275A10V0100LS
      ESV251E04TLC
      ESV751D02YMB
      I55AP222D1A51000WS
      ESV752R06SMC
      I95AE355F1A01030QG
      E84DHPBC1524R4SJNE
      I95AE375D1A010420R
      I95AE322C1C010523R
      I95AE240C1C010103T
      I95AE330C1A010232T
      I95AE355D1C01012Q0
      I95AE275C1AV10203T
      I95AE275F1CV1022QT
      I95AE355C1AV00Z3Q0
      I95AE311D1A010500G
      I95AE275D1A010Z2QT
      I95AE255C1CV10402T
      I95AE240C1A0000220
      I95AE175F1AV1023QR
      E84DHPFC7524R1SNCN
      I95AE275F1C000403G
      I95AE315C1C010Z0QT
      I95AE355F1C010603T
      ESV271N01TFD
      Z25C00CRC0K175F00S
      ESV271P02YFF
      ESV751C01TMB
      I95AE155D1AV006300
      I95AE222D1AV1032QG
      E84DHMFC7524P1SNCE
      I95AE411D1AV00532T
      ESV251N06YME
      ESV751N06SLF
      I95AE175C1C01040QR
      Z25BB0CAC0C211F00S
      I95AE411D1C01022Q0
      I95AE315D1CV005020
      I95AE222C1CV00622T
      I95AE255F1A0005330
      Z25BB0CTC0G240F00S
      Z25ED0ECBAF215F00S
      ESV402C02TMC
      I95AE375D1CV103230
      ESV222C6TME
      I95AE240F1AV10630R
      I95AE175C1A010Z32T
      I95AE215D1C00002QG
      I95AE355F1AV103300
      ESV302P2TFD
      I55AP137F1A500003S
      I95AE222D1CV0020Q0
      I95AE411F1A010422R
      I95AE322C1CV00220T
      ESV222E01YFD
      I95AE322D1C010202T
      I95AE222F1C000032G
      I95AE137D1AV004000
      E94ASHE0244A43DN
      ESV153D1SMB
      ESV153P04YXD
      I95AE240C1AV1053Q0
      I95AE275F1A010Z000
      ESV152E2YXC
      I95AE311C1CV0050QR
      I95AE275D1CV00Z00T
      I95AE137D1A01003QG
      I95AE240F1AV10223R
      E94AMHE0474E33EN
      ESV112P01TFB
      ESV222P2YFB
      E94AMSE1044D43ET
      ESV302D4YMD
      I95AE330D1AV00Z000
      I95AE315C1AV00433R
      I55AP155A20711003S
      I95AE322D1CV0053QT
      I95AE345D1A010Z23G
      I95AE275C1CV003330
      I95AE175F1A00003QG
      Z25C00BTBAG175F00S
      I95AE411C1AV00603R
      ESV183E1TXB
      E70ACMSE0104SA1ETE
      I95AE311C1C010Z300
      I95AE345C1CV106220
      I95AE315C1A000Z33R
      I95AE137F1A0103330
      ESV113C1SXB
      I95AE240F1A010Z33R
      I95AE330F1A000030T
      I55AP155B2070100LS
      ESV303C01YFD
      I95AE375F1C010102T
      ESV303E06SLF
      I95AE345D1CV10102T
      E94AMSE1724E33PM
      ESV402R02TFB
      I95AE137D1CV1063Q0
      I95AE375D1CV10122G
      ESV751E01TMF
      I95AE311F1A01012QG
      I95AE240F1A010222R
      ESV183E4YLE
      I95AE240C1C000Z2Q0
      I95AE375F1AV003020
      ESV152N02TXC
      I95AE322F1AV105320
      I95AE355F1CV002330
      E94AMSE0134E22EO
      I95AE355C1CV10023G
      I95AE345C1A010433R
      I95AE275D1AV00Z32R
      I95AE311F1A010Z0Q0
      ESV373R1YXF
      I95AE375F1AV10003T
      I95AE322F1CV1023QG
      I95AE240F1AV00620R
      I95AE175D1CV00530G
      I95AE330F1AV10Z3QR
      For more information,please contact us freely

      Ask questions

      (0/1,200)

      Max 1200 characters

      • Q: How can I write a review for a purchased product?

        A: After completing the order, you can go to the order page and select the items you want to review from the product list. You can share your shopping experience, and feedback on product quality and service to help other buyers make better decisions.

      • Q: What should I do if I receive a damaged or defective item?

        A: If you receive a damaged or defective item, please contact our customer service team immediately. Provide them with the necessary details and, if possible, include photos of the damage. We will assist you in resolving the issue by offering a replacement, refund, or suitable solution.

      • Q: How can I view the size and specifications of a product?

        A: On the product details page, you can find detailed information about size and specifications, including size charts, specific measurements, and more, to help you select the right product.

      View More
      Question has been sent successfully

      Reviews

      • S

        Stephen Verboczki

        Jan 25, 2024

        Lenze VFD Frequency Converter E82CV551K4C
        Yep...................
        Helpful
        Unhelpful
      • J

        Jonathan Hunt

        Nov 17, 2023

        Lenze VFD Frequency Converter E82CV551K4C
        Fantastic deal on the parts, I highly recommend it.
        Helpful
        Unhelpful
      • H

        Harold Lopez

        Jun 21, 2023

        Lenze VFD Frequency Converter E82CV551K4C
        I'll share my experience after the shipment is received.
        Helpful
        Unhelpful
      • C

        CARBAJAL JUAN

        Jun 06, 2023

        Lenze VFD Frequency Converter E82CV551K4C
        Fantastic!
        Helpful
        Unhelpful
      • A

        Anonymous user

        Nov 25, 2022

        Lenze VFD Frequency Converter E82CV551K4C
        All was ok! No problems whatsoever.
        Helpful
        Unhelpful

      Lenze VFD Frequency Converter E82CV551K4C

      $ 584 .68
      Click here to view shipping costs.

      ✔ In Stock (Can ship in 5-7 days)

      Quantity
      MOQ : 1
      Payment Methods
      T/T pay VISA pay mastercard pay Diners Club pay Discover pay JCB pay American Express pay Stripe pay PayPal pay Google pay Apple pay Link pay venmo pay
      • Online Support 24/7

      • 12 Months Warranty for New Products

      • 30 Days Money Back Guarantee

      People who bought this item also viewed

      New In stock for sale, Lenze Frequency Converter VFD E84AYCETV

      Lenze Frequency Converter VFD E84AYCETV

      US$1728.08
      New In stock for sale, Lenze VFD Frequency Converter E84AVHCE5512SX0

      Lenze VFD Frequency Converter E84AVHCE5512SX0

      US$690.00
      New In stock for sale, Lenze Frequency Converter VFD I51AE175F10V10001S

      Lenze Frequency Converter VFD I51AE175F10V10001S

      US$2000.77
      New In stock for sale, Lenze Frequency Converter VFD E84AVSCE1122SB0

      Lenze Frequency Converter VFD E84AVSCE1122SB0

      US$1516.92
      New In stock for sale, Delta Frequency Converter VFD VFD2800C43A-00

      Delta Frequency Converter VFD VFD2800C43A-00

      US$16835.94
      New In stock for sale, Chint VFD Frequency Converter NVF2-1.5/TS4

      Chint VFD Frequency Converter NVF2-1.5/TS4

      US$423.08
      New In stock for sale, Danfoss Frequency Converter VFD FC-302P7K5T5E20H1XGXXXXSXXXXA0BXCXXXXDX

      Danfoss Frequency Converter VFD FC-302P7K5T5E20H1XGXXXXSXXXXA0BXCXXXXDX

      US$1526.15
      New In stock for sale, Yaskawa Frequency Converter VFD CIMR-V7AZ45P5

      Yaskawa Frequency Converter VFD CIMR-V7AZ45P5

      US$1232.69
      New In stock for sale, Siemens HMI 6AV6642-0DC01-1AX1

      Siemens HMI 6AV6642-0DC01-1AX1

      US$2884.62
      New In stock for sale, Rockwell AB VFD Frequency Converter 20BC260A0ANNANA0

      Rockwell AB VFD Frequency Converter 20BC260A0ANNANA0

      US$26110.75
      New In stock for sale, Honeywell Actuator V4055A1361

      Honeywell Actuator V4055A1361

      US$1230.77
      New In stock for sale, Eisele Reduction Drive Gearbox Speed Reducer DPL118/2 i=20

      Eisele Reduction Drive Gearbox Speed Reducer DPL118/2 i=20

      US$1259.85
      New In stock for sale, JSCC Reduction Drive 80YS25DY22

      JSCC Reduction Drive 80YS25DY22

      US$155.77
      New In stock for sale, MITSUBISHI Spindle Amplifier SPJ2-75

      MITSUBISHI Spindle Amplifier SPJ2-75

      US$2902.50
      New In stock for sale, Innodisk Secure Digital Memory Card Innodisk 1GB

      Innodisk Secure Digital Memory Card Innodisk 1GB

      US$69.23
      New In stock for sale, SIEMENS Module 6SL3225-0BE33-5U

      SIEMENS Module 6SL3225-0BE33-5U

      US$3461.54
      New In stock for sale, SONGLE Relay SMIH-09VDC-SL-A

      SONGLE Relay SMIH-09VDC-SL-A

      US$1.35
      New In stock for sale, LS Battery 17500-DSR

      LS Battery 17500-DSR

      US$20.64

      Customers frequently viewed

      New In stock for sale, IWAYA DENKI Water Pump 25CJT0752

      IWAYA DENKI Water Pump 25CJT0752

      US$2307.69
      New In stock for sale, Panasonic Servo Motor MHMF022L1V2M

      Panasonic Servo Motor MHMF022L1V2M

      US$653.85
      New In stock for sale, Honeywell Solenoid Valve VE4025B1045

      Honeywell Solenoid Valve VE4025B1045

      US$334.62
      New In stock for sale, ROTEN Mechanical Seal 8E5K-22-X

      ROTEN Mechanical Seal 8E5K-22-X

      US$384.62
      New In stock for sale, SANDSUN Overload Pump VA08H-760

      SANDSUN Overload Pump VA08H-760

      US$1568.40
      New In stock for sale, GS Battery 6-QW-60(450)-(55D23L-KR)

      GS Battery 6-QW-60(450)-(55D23L-KR)

      US$646.15
      New In stock for sale, Rechi Compressor 44R273A

      Rechi Compressor 44R273A

      US$341.00
      New In stock for sale, Bosch Rexroth Linear Guideway Runner Block R165381920

      Bosch Rexroth Linear Guideway Runner Block R165381920

      US$107.69
      New In stock for sale, MINDMAN Air Cylinder MCQV2-11-40-200

      MINDMAN Air Cylinder MCQV2-11-40-200

      US$88.46
      New In stock for sale, Mitsubishi Compressor YB645WTG

      Mitsubishi Compressor YB645WTG

      US$549.00
      New In stock for sale, CKD Solenoid Valve AB42-02-6-M2HABS-AC110V

      CKD Solenoid Valve AB42-02-6-M2HABS-AC110V

      Contact Us
      New In stock for sale, SENSORC Light Curtain SEG20-4030N-LO-3-Y

      SENSORC Light Curtain SEG20-4030N-LO-3-Y

      US$982.31
      New In stock for sale, VICKERS Piston Pump PVB29-FRDY-LDY-20-C-CC-CM-11-12-20-JA-PRC

      VICKERS Piston Pump PVB29-FRDY-LDY-20-C-CC-CM-11-12-20-JA-PRC

      US$1071.43
      New In stock for sale, LG LS Contactor 1269039300 GMC-12M AC240V

      LG LS Contactor 1269039300 GMC-12M AC240V

      Contact Us
      New In stock for sale, Delta Fan BFB0305MA-A

      Delta Fan BFB0305MA-A

      Contact Us
      New In stock for sale, TYCO Relay V23061-B1004-A601

      TYCO Relay V23061-B1004-A601

      US$4.23
      New In stock for sale, Lovato Contactor 11BGP0910D

      Lovato Contactor 11BGP0910D

      US$106.38
      New In stock for sale, Omron Servo Motor R88M-K1K030C

      Omron Servo Motor R88M-K1K030C

      Contact Us
      New In stock for sale, ATOS Solenoid Valve DHU-06191-X 24DC 20

      ATOS Solenoid Valve DHU-06191-X 24DC 20

      Contact Us
      New In stock for sale, Mitsubishi Compressor ANB52FKKMT

      Mitsubishi Compressor ANB52FKKMT

      US$1478.87

      Recent related posts

      Ducted Heat Pumps: Everything You Need to Know

      08/31/2023

      Ducted Heat Pumps: Everything You Need to Know

      Are you considering a new heating and cooling system for your home or office? Have you heard about ducted heat pumps, but aren't sure what they are or how they work? If so, this article is for you.

      The cooling effect of industrial chillers is getting worse You may have forgotten this operation

      08/08/2020

      The cooling effect of industrial chillers is getting worse You may have forgotten this operation

      "Strange, why the cooling effect of the chiller I bought has deteriorated?" "How can the temperature drop not as fast as before?" ... Many people who use chillers may have this experience, no matter what kind of chiller,

      Different concepts of air compressor and compressor

      09/08/2020

      Different concepts of air compressor and compressor

      Without understanding of air compressors and compressors, people often have a wrong idea: mistakenly think that air compressors are compressors. In fact, there is still a big difference between the two. Air compressors and compressors are actually two different mechanical products, although they have certain commonalities and connections.

      The design points of capillary refrigeration system

      08/11/2020

      The design points of capillary refrigeration system

      1. On the high-pressure side of the refrigeration system, do not install a liquid reservoir, and try to reduce its effective volume on the premise that the condenser can contain all the refrigerant.

      How does the frequency conversion air compressor save electricity

      06/14/2020

      How does the frequency conversion air compressor save electricity

      How does the frequency conversion air compressor save electricity The frequency converter will automatically adjust the working frequency of the compressor How does the frequency conversion air compressor save electricity? The frequency converter will auﰸ2䀀ᅵ皥䖒皦즠Ʋ娼ི㲈Ʋ䌁皦隆ᮔDž༬皧婆ི

      ABB motor low price spot limited time

      09/20/2020

      ABB motor low price spot limited time

      Shanghai ABB Motor's okmarts.com's ABB motor storage-type spot supplier, was established on Chengdu Airport Road, highway, canal and airport to the whole country. The company has a high-quality, skilled and dedicated team of 30 people.

      Troubleshooting of Overflow Valves

      09/07/2022

      Troubleshooting of Overflow Valves

      Overflow valve is one of the classic industrial products. Today, let's take a look at its common faults and how to solve them.

      Reasons for uneven liquid distribution in refrigeration systems and tragic cases!

      07/31/2020

      Reasons for uneven liquid distribution in refrigeration systems and tragic cases!

      If the distribution head is not evenly distributed, it will cause too much refrigerant in some of the bypasses and frost the evaporator.

      About Mitsubishi Electric (Guangzhou)

      01/11/2021

      About Mitsubishi Electric (Guangzhou)

      About Mitsubishi Electric (Guangzhou) Mitsubishi Electric (Guangzhou) Compressor Co., Ltd. (abbreviated as MGC) is a wholly-owned Japanese enterprise jointly established by Mitsubishi Electric Corporation, Mitsubishi Electric (China) Co., Ltd. and Mitsub器2䀀ᅵ皥䖒皦즠Ʋ㎄ᰙ㲈Ʋ䌁皦ᮔDž༬皧㎎ᰙЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ￿￿뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ᅵ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔDž'鱤džၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ랖僧ޒ識�僬㣢ᐲ臆S㥲ᐲᬄğ識理艏S杴 識杴 㥲ᐲ

      Will the effect of villa ground source heat pump be worse after years of use

      08/19/2020

      Will the effect of villa ground source heat pump be worse after years of use

      In recent years, ground source heat pumps have become a must for villa decoration. Of course, there are also customers who are concerned about whether the effect of ground source heat pumps will deteriorate after years of use. okmarts.com

      • Welcome to O&Kmarts

        Is there anything we can help?

        Email us
      • Feedback

      Join in

      Join in to enjoy exclusive discounts and give you greater discounts

      See More About O&Kmarts Member
      Sign up now

      Common Problem

      Payment Methods
      Shipping Guide
      Sales and Refund Policy
      FAQs

      About O&Kmarts

      About Us
      Membership

      Website Terms

      Privacy Policy
      Terms Of Use
      Bidding Agreement
      Review Rules

      Customer Service

      support01@okmarts.com
      service@okmarts.com
      hydraulic@okmarts.com
      +86-28-84166335
      GMT+08:00 Mon-Fri, 9:00 AM-7:00 PM
      Customer Feedback

      POPULAR PRODUCTS :

      Inovance VFD INVT VFD TOSHIBA VFD Danfoss VFD GEFRAN SIEI VFD Fuji VFD Holip VFD Delta VFD Panasonic VFD Lenze VFD VFD550B43A F510-4050-H3 FRN005G11S-4UH NXL00315C2H1SSS00AA SF-040-30K/22K-G 25CJT0752 MHMF022L1V2M VE4025B1045 8E5K-22-X VA08H-760 ADDA AD0912HB-F93GP AGA5562CXT AGC5553EXG Bauer 72935 D06A 24TS8 Delta GTW091PUU26E-M001 edr 120 48 encoder autonics enc 1 1 t 24 FUJIKOKI EFM-40YGMD-7R 5K2 GMCC PH215G1C-4DZ1 hlj083t4lc8 HNB71FA-YBE KONOR GQR60AA MAC 34B-NOO-GDNC-1KT Mitsubishi RB233YABC MSMF012L1V2M Parker Sporlan 111259 Rexroth 4WE6D61/EG24NZ5L sz148t4vc compressor Toshiba PE90H1F-9

      Disclaimer: All brand names, model or type numbers or marks listed on the website are owned by their respective manufacturers. These terms are used for identification purposes only and are not intended to indicate affiliation with OEM companies. Product pictures shown on the website are for illustrative purposes only and the actual item may vary in design, specification, etc. Confirm at the time of purchase if you are unsure.

      © eCommerce. 2017-2025. All Rights Reserved
      © eCommerce. 2017-2025. All Rights Reserved
      Press and drag the mouse to start taking a screenshot