DC/AC Inverters

Schaefer IT Series Inverter

The Schaefer IT Series offers versatile and high-performance solutions for DC/AC inversion and AC/AC frequency conversion across industrial and critical infrastructure applications. Available in power ratings from 0.2 kVA to 15 kVA, the IT Series provides 1-phase output options of 115Vac or 230Vac, with standard output frequencies of 50Hz, 60Hz,...

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The Schaefer IT Series offers versatile and high-performance solutions for DC/AC inversion and AC/AC frequency conversion across industrial and critical infrastructure applications. Available in power ratings from 0.2 kVA to 15 kVA, the IT Series provides 1-phase output options of 115Vac or 230Vac, with standard output frequencies of 50Hz, 60Hz, 400Hz, and 800Hz, as well as programmable frequencies from 40Hz to 400Hz. For DC/AC inverters, input voltages range from 20Vdc to 800Vdc, while AC/AC frequency converters support both 1-phase and 3-phase input voltages. The IT Series is available in wall-mount configurations or as Euro-Cassette modules for integration within a 6U subrack, with optional standalone output transformers for enhanced versatility. Cooling options include natural convection or fan-assisted designs, ensuring optimal performance in various operating environments. All models feature integrated transformers, providing robust isolation and voltage transformation, ensuring reliable and precise operation for demanding industrial applications.

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Schaefer IT Series Inverter
Features
  • Power ratings from 0.2 kVA to 15 kVA for DC/AC inverters and AC/AC frequency converters.
  • 1-phase outputs of 115Vac or 230Vac, with frequencies of 50Hz, 60Hz, 400Hz, 800Hz, and programmable 40-400Hz options.
  • DC input voltages range from 20Vdc to 800Vdc; AC input supports 1-phase and 3-phase configurations.
  • Flexible mounting options: wall-mount or Euro-Cassette for 6U subrack integration, with standalone output transformers.
  • Cooling options: natural convection or fan-assisted designs for varied environments.
  • Can be used in conjunction with Schaefer Static Switch (SS) or UPS Module for use within Industrial UPS system.
Specifications
INPUT
Input voltage

20-800Vdc or 
115/ 230Vac, 1ph, 47-400Hz or
200/ 400/ 480Vac, 3ph, 47-400Hz
See selection table
For Input Voltages 160 - 800Vdc, Contact Powerbox Units will turn off with under or over input voltage.
No-load input power 10 - 30W model (series dependent)
Inrush current for AC input and DC input >160V: limited by thermistor
Hold-up time AC input: 10 ms typical
Input Options

i: Inrush current limiting
ie:Electronic inrush current limiting 
sd: Reverse polarity protection for DC input by series diode 
ad: Reverse polarity protection for DC input by anti-parallel diode
au:Auto-ranging See selection table for details
OUTPUT
Output voltage 1ph: 115Vac, 230Vac
3ph: 3x200Vac3x400Vac, 3x480Vac
See selection table
Output power 200VA up to 45KVA
See selection table
Line regulation 2% (±10%)
Load regulation 1% typical, 3% max, load step 10-90%
Turn on rise time soft-start, 100ms typical
Waveform sine wave or any wave shape programmable by external signal
Frequency 40 – 800 Hz: adjustable or programmable or any fixed frequency (crystal stabilized)
Distortion 3 % typical 5 % @ 400 Hz
7 % @ 40 – 400 Hz, 800Hz
Surge power 2 x nominal power for 1 s
Crest factor approx. 3
Power factor cos 0.7 inductive / capacitive
Efficiency 80 – 92 %
Output Options red: Inverter parallel operation: for IT5xxx
h1: Inhibit by external closing contact, signal referred to input
h2: Inhibit by voltage signal, signal referred to output
h3: Inhibit by closing contact, signal referred to output See selection table for further details
Signal Options pr: Input voltage supervision (power ok) incl. relay contacts
ac: AC ok for inverter including relay contacts See selection table for further details
PROTECTION
Overload protection current limited to approx. 1.05 x nominal current (steady state)
Short circuit protection electronically limited to 3 x nominal current, unit switches off after 1s
MTBF 120Khrs at 40°C
acc. to MIL-HDBK-217E (notice 1)
ENVIRONMENTAL
Operating temperature -20°C to +75°C
(optional -40 to 75C)
Load derating Derate 2.5% per °C, from +55°C to 75°C
Storage temperature -40°C to +85°C
Cooling H: Heatsink - natural convection
TF: Temperature controlled Fan included
See selection table
Humidity Up to 95% RH, non-condensing
Environment Options t: Tropical protection
c: Extended temperature range
ms: Increased mechanical strength
See selection table for further details
STANDARDS
Immunity acc. to EN 61000-6-2
Safety / Construction acc. to EN60950-1 / EN50178
Protection category IP20 acc. to EN60529 NEMA or others on request
EMI standards acc. to EN61000-6-4 class A, optionally class B
MECHANICAL
Mounting Rack Mount and Wall Mounting See technical illustrations
Dimensions and weight See Technical illustration
Selection Table
INPUT 20 - 32 VDC OUTPUT KVA SIZE INPUT 40 - 64 VDC INPUT 50 - 80 VDC OUTPUT KVA SIZE INPUT 80 - 160 VDC OUTPUT KVA SIZE COOLING OUTPUT VAC
IT1626 0.2 A IT1636 IT1646 0.4 A IT1656 0.5 A H 115
IT3636 IT3646 0.5 B IT3656 1 B H 115
IT3856 1.2 C H 115
IT4836 IT4846 1.2 D IT4856 2 D H 115
IT5636 IT5646 2 E IT5656 3 E TF 115
IT5736 IT5746 3 E IT5756 5 F+T1 TF 115
IT1628 0.2 A IT1638 IT1648 0.4 A IT1658 0.5 A H 230
IT3638 IT3648 0.5 B IT3658 1 B H 230
IT3858 1.2 C H 230
IT4838 IT4848 1.2 D IT4858 2 D H 230
IT5638 IT5648 2 E IT5658 3 E TF 230
IT5738 IT5748 3 E IT5758 5 F+T1 TF 230
Cooling
H: Heatsink - natural convection
TF: Temperature controlled Fan included
Input Voltages
For Input Voltages 160 - 800VDC, Contact Powerbox
Size
For Sizes A to L, see Technical Illustrations
Model designation options: Add the designation of options to the model number, eg. C3660-dd-dr-cs Options for Input, Output, Environmental and Mechanical follow.
19" Rack Mounting Options Subrack Height 3U, 5U, 6U Wiring, Front Panels Accessories: Fuses, MCBs, Mains on/off switch Contact Powerbox for rack configuration
INPUT OPTIONS
Option “i” (inrush current limiting): A thermistor is connected in series with the input lines which changes its resistance from high to low when it gets hot. It does not reduce the current surge if the input power is interrupted for a short period of time not allowing the thermistor to cool down. Thermistors are fitted as standard to all mains input models except for 1-phase input of models > 2.5kW. Thermistors are available up to 45A. For higher input current an electronic inrush current limitation can be offered.
Option “ie” electronic inrush current limiting An electronic circuit limits the inrush current.
Option “sd” (series diode): A series diode protects the module against input voltage of wrong polarity (additional power losses).
Option “ad” (anti-parallel diode): To avoid the power losses of a series diode a diode is provided with opposite polarity in parallel to the input blowing an internal or external fuse if the module is connected to a supply with wrong polarity.
Option “au” (auto-ranging) For standard dual AC input models the range of 115/230Vac is to be selected by connecting the input line to different pins on the connector. With auto-ranging the unit senses the input voltage and provides automatically the correct connection.
Option “p” (power fail): A signal (logic or relay) is given if the input voltage (AC or DC) drops below the specified limit. In AC input units we sense the rectified input voltage so that a power fail alarm will not be triggered if at light loads mains power returns before the input capacitors are substantially discharged.
Option “r” (relay): A relay instead of a logic signal is provided for failure indication.
output options
Option “dd” (decoupling diode): For redundant operation the outputs of two or more units are paralleled behind de-coupling diodes so that an internal fault of one module does not affect the operation of the others. These diodes cause power losses.
Option “cs” (active current sharing): An additional control circuit provides active current sharing via an interconnecting wire between converters that operate in parallel. Active current sharing should be used for multi-output units operating inparallel.
Option “csi” (current sharing interrupt): Option "csi" will effect the removal of the "cs" signal. Should there be an instance where a unit is not supplying the load, then the effect of its "cs" signal is removed, and the load voltage is unaffected by this condition.
Option “h1” (inhibit): A terminal connected to the negative input line also shuts off the converter. This can also be used in conjunction with a thermal trip which shuts the unit down.
Option “h2” (inhibit): Operation of the unit is inhibited if a voltage signal (5V/10mA) is applied in reference to the negative line of the (main) output.
Option “rco” (reducing current limiting at over temperature) A circuit reduces the current limiting level at higher temperature (to be specified).
Option “d” (DC-ok, one output): A logic signal is given if the output voltage (main output in multi-output systems) is below the specified limit.
Option “m” (DC-ok, all outputs): In multi-output systems a logic signal is provided if the voltage of any output is below the specified limit.
Option “ac” (AC ok) A logic signal connected to relay contacts is given if the output voltage of an inverter is below the specified limit.
Option "y" (sys-reset): This logic signal is a combination of power fail and DC-ok as specified for VME systems.
Option "r" (relay): A relay instead of a logic signal is provided for failure indication.
environment options
Option "t" (tropical protection):The unit is given additional protection by a heavy coat of varnish on the printed circuit board(s) and components.
Option "c" (extended temperature range):The circuit is designed and tested for operation at an ambient temperature as low as –40 °C.
Option "ms" (increased mechanical strength): Screws are secured by Locktite and heavy components are fastened by ties and/or glue. Modules with the "ms" option meet the standard EN61373 regarding shock and vibration.
mechanical options
Standard mounting "Eurocassette" pluggable module for 19" sub-racks
Option "w" (wall mounting): Module is screwed against a mounting plate for installation in a cabinet. The load connections are typically a terminal block.
Technical Drawings
Technical drawing of a Eurocassette enclosure. Schaefer IT1600-SERIES DC/AC Inverter Diagram showing the standard and optional wall-mounted versions of a size B Eurocassette. Two diagrams showing Size C eurocassettes with dimensions. Diagram showing two versions of a Size D Eurocassette enclosure. Technical drawing of a Size F 19-inch plug-in module and wall-mount option. Schematic of a 3U, 19-inch rackmount chassis. Technical drawing showing dimensions for a plug-in module and a wall-mounted gizmo. Technical diagram showing transformer sizing tables and electrical component specifications.
Downloads
Schaefer_it_series_inverters.pdf
Warranty & Returns

Warranty periods vary by product. Please refer to the Powerbox Warranty Policy for the applicable coverage period against manufacturing defects from date of purchase. For returns and RMA requests, please visit our RMA support page or contact our support team directly.