Used Frequency Converter 4.0 Kva for sale (9,748)

Condition: new, Year of construction: 2025, Model 2022 - the marking hero among the laser markers! Metal - plastics and much more! Easy. Simple. Precise. - EZCAD 3 (real 64bit map) with up to 4 axes - Windows Professional 64bit - Intel I3 or I5 with 8Gb and ultra fast M2 hard disk - 23" TFT screen for fatigue-free work - Professional MOPA fiber laser source JPT with 20 Watt output power and up to 600 kHz (optionally with variable pulse width and up to 2000 kHz for color start marking) - Scanner unit "DigiScan Eco 10" for detail and precision. - T-slot plate or threaded hole plate for easy mounting and positioning of your workpiece - large viewing window with certified glass - Scanning area approx. 100 x 100 mm (optional 150/200/300 mm) - manual height adjustment with focus finder - Housing with man. Door easy and safe marking. - Professional marking software in German language - Barcode and QR Code support - Serial number function - Batch scanning from Excel file, network or database! - Laser parameter finder per matrix via 2 parameters (e.g. frequency to speed, frequency to power) - TCP IP connectivity. Various commands can now be transmitted to the software via TCP protocol. This allows the easy integration of external components like camera position detection etc. - Industry 4.0 over the TCP/IP protocol the status can be processed at any time - Inputs and outputs for automation - New look and feel. A fresh design, for even clearer and more pleasant operation - 3D preview for rotary axis machining - Performance increase of up to 50% through 64Bit Technology - Improved stability - Optionally up to 4 axis controls WITHOUT switching via PLUGins. - Optional DEEP engraving (Slicer software with control of the Z axis) - New algorithms increase the engraving speed for hatching. - Completely redesigned galvo generation (Eco, Hi-Speed & 3D) with 2x laser pointer for visual checking of the focus position. - LED-illumination of the marking area for good illumination - Connection possibility for external suction Isdpfef E Idzjx Ahyjbc - Start button and EMERGENCY STOP on the housing - Software suitable for Windows 10 - USB cable to connect to the computer - Operating instructions and operating software in German As an option we offer among others =ᐳ Base with castors and space for computer and suction =ᐳ IPG or SPI fiber laser sources in different powers =ᐳ motorized and automatic height adjustment =ᐳ Scanlab equipment =ᐳ suitable suction =ᐳ Automation for placement, conveyor belts and much more! =ᐳ 3D marking and engraving function. =ᐳ automatic focus adjustment via special laser sensor =ᐳ Rotating unit in different versions =ᐳ motorized slides in X and Y =ᐳ Interlock system for lettering WITHOUT protective housing, but only PSA (personal protective equipment) for bulky parts incl. training in our training center Schweinfurt! Our engraving lasers are manufactured in our Schweinfurt factory! Therefore individual wishes are possible at any time! =ᐳ Made in Schweinfurt! Pictures may contain options! We are your partner for laser engraving machines and laser engravers. No matter if manual or automatic laser marking machine. We would be pleased to submit you an offer.

Condition: used, Measuring transducers, power measuring transducers, active power measuring transducers, analog converters, frequency/analog converters, frequency dividers, isolating converters, signal converters, isolating converters, switching amplifiers -Manufacturer: Schuhmann, universal isolating amplifier Ibodpfef Iyu Tjx Ahyec -Type: UT 1.00G -Price: per piece -Number: 6 piece -Dimensions: 80/23/H105 mm -Weight: 0.1 kg/piece

Condition: good (used), Interface converter, converter module, FL Comserver -Manufacturer: Phoenix Contact, FL Comserver -Type: Basic 232/422/485 Ord.-No. 23 13 478 -Price: per piece -Quantity: 3 available -Dimensions: 100/20/H110 mm -Weight: 0.1 kg/pc. Ibedpef Rumljfx Ahysc

Condition: new, Year of construction: 2025, Model 2022 - the marking hero among the laser markers! Metal - plastics and much more! Easy. Simple. Precise. - EZCAD 3 (real 64bit map) with up to 4 axes - Windows Professional 64bit - Intel I3 or I5 with 8Gb and ultra fast M2 hard disk - 23" TFT screen for fatigue-free work - Professional MOPA fiber laser source JPT with 20 Watt output power and up to 600 kHz (optionally with variable pulse width and up to 2000 kHz for color start marking) - Scanner unit "DigiScan Eco 10" for detail and precision. - T-slot plate or threaded hole plate for easy mounting and positioning of your workpiece - large viewing window with certified glass - Scanning area approx. 100 x 100 mm (optional 150/200/300 mm) - manual height adjustment with focus finder Isdpfx Ahsfz D E Toyobc - Housing with man. Door easy and safe marking. - Professional marking software in German language - Barcode and QR Code support - Serial number function - Batch scanning from Excel file, network or database! - Laser parameter finder per matrix via 2 parameters (e.g. frequency to speed, frequency to power) - TCP IP connectivity. Various commands can now be transmitted to the software via TCP protocol. This allows the easy integration of external components like camera position detection etc. - Industry 4.0 over the TCP/IP protocol the status can be processed at any time - Inputs and outputs for automation - New look and feel. A fresh design, for even clearer and more pleasant operation - 3D preview for rotary axis machining - Performance increase of up to 50% through 64Bit Technology - Improved stability - Optionally up to 4 axis controls WITHOUT switching via PLUGins. - Optional DEEP engraving (Slicer software with control of the Z axis) - New algorithms increase the engraving speed for hatching. - Completely redesigned galvo generation (Eco, Hi-Speed & 3D) with 2x laser pointer for visual checking of the focus position. - LED-illumination of the marking area for good illumination - Connection possibility for external suction - Start button and EMERGENCY STOP on the housing - Software suitable for Windows 10 - USB cable to connect to the computer - Operating instructions and operating software in German As an option we offer among others =ᐳ Base with castors and space for computer and suction =ᐳ IPG or SPI fiber laser sources in different powers =ᐳ motorized and automatic height adjustment =ᐳ Scanlab equipment =ᐳ suitable suction =ᐳ Automation for placement, conveyor belts and much more! =ᐳ 3D marking and engraving function. =ᐳ automatic focus adjustment via special laser sensor =ᐳ Rotating unit in different versions =ᐳ motorized slides in X and Y =ᐳ Interlock system for lettering WITHOUT protective housing, but only PSA (personal protective equipment) for bulky parts incl. training in our training center Schweinfurt! Our engraving lasers are manufactured in our Schweinfurt factory! Therefore individual wishes are possible at any time! =ᐳ Made in Schweinfurt! Pictures may contain options! We are your partner for laser engraving machines and laser engravers. No matter if manual or automatic laser marking machine. We would be pleased to submit you an offer.

Year of construction: 2023, condition: new, Model 2022 - the marking hero among the laser markers! Ibodpsfz D Hfefx Ahyjc Metal - plastics and much more! Easy. Simple. Precise. - EZCAD 3 (real 64bit map) with up to 4 axes - Windows Professional 64bit - Intel I3 or I5 with 8Gb and ultra fast M2 hard disk - 23" TFT screen for fatigue-free work - Professional MOPA fiber laser source JPT with 20 Watt output power and up to 600 kHz (optionally with variable pulse width and up to 2000 kHz for color start marking) - Scanner unit "DigiScan Eco 10" for detail and precision. - T-slot plate or threaded hole plate for easy mounting and positioning of your workpiece - large viewing window with certified glass - Scanning area approx. 100 x 100 mm (optional 150/200/300 mm) - manual height adjustment with focus finder - Housing with man. Door easy and safe marking. - Professional marking software in German language - Barcode and QR Code support - Serial number function - Batch scanning from Excel file, network or database! - Laser parameter finder per matrix via 2 parameters (e.g. frequency to speed, frequency to power) - TCP IP connectivity. Various commands can now be transmitted to the software via TCP protocol. This allows the easy integration of external components like camera position detection etc. - Industry 4.0 over the TCP/IP protocol the status can be processed at any time - Inputs and outputs for automation - New look and feel. A fresh design, for even clearer and more pleasant operation - 3D preview for rotary axis machining - Performance increase of up to 50% through 64Bit Technology - Improved stability - Optionally up to 4 axis controls WITHOUT switching via PLUGins. - Optional DEEP engraving (Slicer software with control of the Z axis) - New algorithms increase the engraving speed for hatching. - Completely redesigned galvo generation (Eco, Hi-Speed & 3D) with 2x laser pointer for visual checking of the focus position. - LED-illumination of the marking area for good illumination - Connection possibility for external suction - Start button and EMERGENCY STOP on the housing - Software suitable for Windows 10 - USB cable to connect to the computer - Operating instructions and operating software in German As an option we offer among others =ᐳ Base with castors and space for computer and suction =ᐳ IPG or SPI fiber laser sources in different powers =ᐳ motorized and automatic height adjustment =ᐳ Scanlab equipment =ᐳ suitable suction =ᐳ Automation for placement, conveyor belts and much more! =ᐳ 3D marking and engraving function. =ᐳ automatic focus adjustment via special laser sensor =ᐳ Rotating unit in different versions =ᐳ motorized slides in X and Y =ᐳ Interlock system for lettering WITHOUT protective housing, but only PSA (personal protective equipment) for bulky parts incl. training in our training center Schweinfurt! Our engraving lasers are manufactured in our Schweinfurt factory! Therefore individual wishes are possible at any time! =ᐳ Made in Schweinfurt! Pictures may contain options! We are your partner for laser engraving machines and laser engravers. No matter if manual or automatic laser marking machine. We would be pleased to submit you an offer.

Condition: new, Year of construction: 2025, Model 2022 - the marking hero among the laser markers! Metal - plastics and much more! Easy. Simple. Precise. - EZCAD 3 (real 64bit map) with up to 4 axes - Windows Professional 64bit - Intel I3 or I5 with 8Gb and ultra fast M2 hard disk - 23" TFT screen for fatigue-free work Ijdjfz D Hiopfx Ahyjbc - Professional MOPA fiber laser source JPT with 20 Watt output power and up to 600 kHz (optionally with variable pulse width and up to 2000 kHz for color start marking) - Scanner unit "DigiScan Eco 10" for detail and precision. - T-slot plate or threaded hole plate for easy mounting and positioning of your workpiece - large viewing window with certified glass - Scanning area approx. 100 x 100 mm (optional 150/200/300 mm) - manual height adjustment with focus finder - Housing with man. Door easy and safe marking. - Professional marking software in German language - Barcode and QR Code support - Serial number function - Batch scanning from Excel file, network or database! - Laser parameter finder per matrix via 2 parameters (e.g. frequency to speed, frequency to power) - TCP IP connectivity. Various commands can now be transmitted to the software via TCP protocol. This allows the easy integration of external components like camera position detection etc. - Industry 4.0 over the TCP/IP protocol the status can be processed at any time - Inputs and outputs for automation - New look and feel. A fresh design, for even clearer and more pleasant operation - 3D preview for rotary axis machining - Performance increase of up to 50% through 64Bit Technology - Improved stability - Optionally up to 4 axis controls WITHOUT switching via PLUGins. - Optional DEEP engraving (Slicer software with control of the Z axis) - New algorithms increase the engraving speed for hatching. - Completely redesigned galvo generation (Eco, Hi-Speed & 3D) with 2x laser pointer for visual checking of the focus position. - LED-illumination of the marking area for good illumination - Connection possibility for external suction - Start button and EMERGENCY STOP on the housing - Software suitable for Windows 10 - USB cable to connect to the computer - Operating instructions and operating software in German As an option we offer among others =ᐳ Base with castors and space for computer and suction =ᐳ IPG or SPI fiber laser sources in different powers =ᐳ motorized and automatic height adjustment =ᐳ Scanlab equipment =ᐳ suitable suction =ᐳ Automation for placement, conveyor belts and much more! =ᐳ 3D marking and engraving function. =ᐳ automatic focus adjustment via special laser sensor =ᐳ Rotating unit in different versions =ᐳ motorized slides in X and Y =ᐳ Interlock system for lettering WITHOUT protective housing, but only PSA (personal protective equipment) for bulky parts incl. training in our training center Schweinfurt! Our engraving lasers are manufactured in our Schweinfurt factory! Therefore individual wishes are possible at any time! =ᐳ Made in Schweinfurt! Pictures may contain options! We are your partner for laser engraving machines and laser engravers. No matter if manual or automatic laser marking machine. We would be pleased to submit you an offer.

Condition: good (used), Year of construction: 2002, Transformer 400 kVA Iodjvnifgopfx Ahyjbc Own weight: 1410 kg Loading and shipping are possible! Please arrange an appointment for inspection in advance!

Condition: used, Technical details: turning speeds: 10000 U/min output: 22 kw weight approx.: 20 kg transmission ratio: 1: 4,3 Ibsdsvb A Ubspfx Ahyjc high speed spindle with 1 : 4,3 ratio, MK 5 spindle taper and collet chuck for tooling. Misc. parts in wooden case. *

Condition: used, different typesmore information under Download Iedodc A Rqjpfx Ahyebc

Condition: good (used), Stick electrodes 4.0 x 350 Ibjdpfx Ahjd Iuxkoyec -Type: Overcord -Price: per package -Number: 5 packages available -Weight per package: 5 kg

Condition: used, Stick electrodes 4.0 x 450 Isdped Iygwjfx Ahyobc -Type: Phoenix K 50 -Price: per package -Number: 5 packages available -Weight per package: 5.8 kg

Condition: used, Stick electrodes 4.0 x 450 -Type: SH Yellow B Ibodpjd Iygxsfx Ahyoc -Price: per package -Number: 2 packages available -Weight per package: 6 kg

Condition: used, PTC thermistor relay, contactor, semiconductor contactor, contactor, relay, fiber optic converter -Manufacturer: Phoenix Contact, fiber optic converter -Type: PSI-MOS-DNET CAN/FO 850/BM -Price: per piece -Number: 59 pieces -Dimensions: 100/23/H110 mm -Weight: 0.2 kg/piece Ibedpfjfg E E Rox Ahysc

Year of construction: 2025, condition: new, Model 2025 for Industry 4.0! Laser marking system for: =ᐳ Marking =ᐳ Annealing of metals =ᐳ Marking of many materials =ᐳ Deep engraving Extremely detailed and high-contrast engravings thanks to the JPT-MOPA system fiber laser source (variable pulse width, on request). Simple operation and handling! Our exclusive XL laser marking system stands out due to: Iedpfx Ahed S H Nysyebc • Professional fiber laser source JPT MOPAfix 20 or 30W • 1064nm, 20-400 kHz (for perfect annealing engravings) • Scanner unit "New Generation ECO" • 19" PC control, no external card needed! • Very large viewing window with certified laser safety glass • Scanning area approx. 150 x 150 mm • Electric height adjustment • Full enclosure with 4 rollers • "Weightless" lifting door for safe marking. EZCAD III software: • Barcode and QR code support • Serial number function • Batch scanning from Excel file • Laser parameter finder via matrix with 2 parameters • TCP/IP connectivity for external components • Industry 4.0: The status can be processed at any time via the TCP/IP protocol. • Inputs and outputs for direct communication • New look and feel and fresh design • Even clearer and more intuitive operation • 3D preview for rotary axis machining • Performance increase of up to 50% through 64-bit architecture • Improved stability through integrated controller card • Optional up to 4 axis controls (integrated) • Optional DEEP engraving with Z-axis • More efficient algorithms for fast hatching. • Completely newly designed galvanometer generation • 2x laser pointer to check the focus position. • LED lighting of the marking area • Connection option for external extraction • Start button and emergency stop on the housing • USB and network connection for data access • Operating manual and operating software in German • Protective enclosure according to laser class 1 • Includes 4 hours of training in our training center (max. 2 people) Do you need something customized? We are happy to help. Choose from our numerous accessories: =ᐳ Camera systems for object recognition =ᐳ Fiber laser source in virtually all variations =ᐳ Motorized and automatic height adjustment =ᐳ Scanlab equipment =ᐳ Automation for part loading =ᐳ Conveyor belts for infeed and outfeed =ᐳ 3D marking and engraving function. =ᐳ Automatic focus adjustment =ᐳ Rotary unit =ᐳ Motorized slides =ᐳ Interlock system for marking WITHOUT a protective housing, but only with PPE (personal protective equipment) for bulky parts. Our engraving lasers naturally allow for individual customization in design and size! =ᐳ Made in Schweinfurt! Images may include options! Laser engraving machine, laser marker, laser marking, laser engraving, laser engraver, laser marking machine, laser engraving machine, laser marking system, marking laser. Laser engraving machine, laser marker, laser marking, laser engraving, laser engraver, laser marking machine, laser engraving machine, laser marking system, marking laser, Markierheld

Year of construction: 2025, condition: new, Model 2025 for Industry 4.0! Laser marking system for: =ᐳ Marking =ᐳ Annealing of metals =ᐳ Marking of various materials =ᐳ Deep engraving Extremely detailed and high-contrast engravings thanks to the JPT-MOPA system fiber laser source (variable pulse width). Simple operation and handling! Our exclusive XL laser marking system stands out due to: • Professional fiber laser source JPT MOPAfix 20 or 30W power • 1064nm, 20-400 kHz (for perfect annealing engravings) • "New Generation ECO" scanner unit • 19" PC control, no external card! • Very large viewing window with certified laser safety glass • Scanning area approx. 150 x 150 mm • Electric height adjustment • Full enclosure with 4 rollers • "Weightless" lift door for safe marking. EZCAD III Software: • Barcode and QR code support • Serial number function • Batch scanning from Excel file • Laser parameter finder via matrix with 2 parameters • TCP IP connectivity for external components • Industry 4.0: The status can be processed at any time via the TCP/IP protocol. • Inputs and outputs for direct communication • New look and feel with a fresh design • Even clearer and more intuitive operation • 3D preview for rotary axis machining • Performance increase of up to 50% through 64-bit architecture • Improved stability through integrated control board • Optionally up to 4 axis control (integrated) • Optional deep engraving with Z-axis Ibjdpfod S H Nzox Ahyjc • More efficient algorithms for fast hatching. • Completely redesigned galvo generation • 2x laser pointer for checking the focus position. • LED lighting of the marking area • Connection option for external extraction • Start button and EMERGENCY STOP on the housing • USB and network connection for data access • Operating manual and software in German • Protective enclosure acc. to laser class 1 • Incl. 4 hours of training in our training center (max. 2 people) Do you need customization? We're happy to help. Choose from our numerous accessories: =ᐳ Camera systems for object recognition =ᐳ Fiber laser source in almost all variations =ᐳ Motorized and automatic height adjustment =ᐳ Scanlab equipment =ᐳ Automation for loading =ᐳ Conveyor belts for infeed and output =ᐳ 3D marking and engraving function. =ᐳ Automatic focus adjustment =ᐳ Rotary unit =ᐳ Motorized carriage =ᐳ Interlock system for marking WITHOUT a protective enclosure, but only with PPE (personal protective equipment) for bulky parts. Our engraving lasers naturally allow for individual designs and sizes! =ᐳ Made in Schweinfurt! Images may contain options! Laser engraving machine, laser marker, laser marking, laser engraving, laser engraver, laser marking, laser engraving machine, laser engraving machine, laser marking machine, laser marking system, laser marking system, marking laser, marking laser Laser engraving machine, laser marker, laser marking, laser engraving, laser engraver, laser marking, laser engraving machine, laser engraving machine, laser marking machine, laser marking system, laser marking system, marking laser, marking laser, marking hero

Condition: good (used), Power converter -Type: Sitop power 20 -Input: 3 AC 400 V -Output: DC 24 V/20 A Ijdpfx Ahjd S Sn Isyobc -Dimensions: 240/130/H130 mm -Weight: 3.8 kg

Condition: good (used), Converter, converter, converter, drive converter, controller, inverter -SEW: Movitron Type 355 825074X -Input: E 380-415 V 50 (60) Hz -Output: G 0 ... 460 V 55 A -Temperature: 0-45 °C -Protection class: IP00 Iedpfx Aofmgu Hohyobc -Dimensions: 335/220/H175 mm -Weight: 7.2 kg

Condition: used, electrical drives: Siemens Simoreg DC converter SIEMENS Simoreg 6RA7025-6FV62-0 DC electric drive, digital automatic control (converter) nominal power, kW 28.8 Ibsdpedl Anbjfx Ahyoc Input: 3AC 460V - 50A 50/60HZ Output(DC Rating): DC+-480V 60A Output(US Rating): DC+-500V 30A Field Supply: Input: 2AC 460V 10A 50/60Hz Output: DC 375V 10A

Condition: good (used), Power converter, power supply, power supply unit, servo power unit -Manufacturer: Baumüller -Type: BUS21-15/30-30-001 -Quantity: 1 available -Dimensions: 400/55/H310 mm -Weight: 4.9 kg Ibodpfx Aedpg T Njhyjc

Condition: good (used), Year of construction: 2010, Conveyor belt, belt conveyor belt, conveyor belt, belt conveyor, belt conveyor, flat belt conveyor -Manufacturer: Interroll, belt conveyor type 4081 -Speed: frequency controlled, up to approx. 150 m/min -Strap width: 550 mm -Conveying length: 655 mm -Drive: SEW-Eurodrive 0.55/0.055 kW, see photo of nameplate Iedoqxd Ddspfx Ahyjbc -Quantity: 1x conveyor belt available -Transport dimensions: 960/670/H215 mm -Weight: 49 kg

Condition: good (used), Year of construction: 2010, Conveyor belt, belt conveyor, conveyor belt, belt conveyor, belt conveyor, flat belt conveyor -Manufacturer: Interroll, belt conveyor type 4081 -Speed: frequency controlled, up to approx. 75 m/min -Strap width: 450 mm -Conveying length: 2470 mm -Drive: SEW-Eurodrive 1.5/0.15 kW, see photo of nameplate -Quantity: 1x conveyor belt available -Transport dimensions: 2470/850/H350 mm -Weight: 131 kg Iedpfxeqxvxho Ahysbc

Condition: used, empty load weight: 2,160 kg, maximum load weight: 180 kg, overall weight: 2,340 kg, axle configuration: 1 axle, first registration: 04/2001, color: green, Year of construction: 2001, operating hours: 2,737 h, fuel type: diesel, gearing type: other, driver cabin: other, construction height: 2,960,000 mm, Equipment: car registration, low noise, * German device * 1st hand * Condition see photos * Lehmann floodlight unit consisting of power generator and light mast trailer * Original only 2,737 operating hours * Last inspection at 2,700 operating hours * Electro-hydraulically controlled telescopic mast * 9.50 m extension height * Lamp holder can be rotated 360° and swiveled 180 * 2 x halogen floodlights 2,000 W each * 4 x halogen floodlights, 1,500 W each * Own diesel generator/power generator with 20 kVA/16 kw * Connected voltage 230/ 400 V/ 50 Hz * 3 x earthed sockets 16 A * 1 x CEE attachment socket 400 V 16 A Isdpfepk Awzex Ahyjbc * 1 x CEE add-on socket 400 V 32 A * All sockets IPX7 * Trailer operation for cars and trucks (ball head and jaw coupling) * Transport height 2.96 m * 80 Km/h approval * All motion drives are identical and can be replaced in a few simple steps * GVW: 2,340 kg * Unladen weight: 2,160 kg. If new TÜV approval is required, we will be happy to make you an offer from our partner workshops. Our offer is generally WITHOUT new TÜV approval, without new DGUV, without new SP, without new UVV. You can find more trucks on our homepage at We speak the following languages: German, English, Polish, Turkish Note: We offer and strongly recommend a viewing and inspection of the goods to ensure that the buyer has no misconceptions about the condition and suitability of the goods. Inspections and tests are possible at any time by appointment and are expressly desired. All information is without guarantee. No liability is accepted for errors and incorrect information in the offer. The buyer is obliged to independently check the condition and equipment of the goods/vehicles. Subject to alterations, prior sale and errors excepted. - .

Condition: good (used), Arm design: 270 mm Ibodpfx Aepy Dy Eohyec Power: 125 kVA

Condition: used, Year of construction: 2001, Conveyor belt, belt conveyor belt, conveyor belt, belt conveyor, belt conveyor, flat belt conveyor -Manufacturer: Transnorm, belt conveyor type TS 1200 -Speed: frequency controlled, up to approx. 205 m/min -Drive: SEW-Eurodrive 0.055/0.55 kW, see photo of nameplate -Voltage: 380-500V -Brake: 5 Nm Ibsdjp Ta Uvepfx Ahysc -Strap width: 500 mm -Conveying length: 848 mm -Quantity: 2x conveyor belt available -Price per piece -Transport dimension: 875/700/H345 mm -Weight: 64 kg/St.

Condition: good (used), Transformer, transformer, converter, three-phase autotransformer, three-phase transformer, three-phase transformer, single-phase transformer Isdpfxeqmtz Re Ahysbc -Manufacturer: ismet, transformer type CST -Power: 0.5 kVA -Technical data: see photo nameplate -Dimensions: 150/105/H140 mm -Weight: 7.6 kg