TDK B32377G1426J000 FilterCap 3 x 42 uF Gas-Filled AC Capacitor

A gas-filled film capacitor for inverter input and output filters

The TDK B32377G1426J000 is a three-phase FilterCap MKD AC capacitor with a delta connection, 3 x 42 uF, rated 1415 V line to line with a 1000 V RMS working voltage. It belongs to TDK’s power electronic capacitor line rather than the PFC line: metallised polypropylene film in an aluminium can and top, filled with dry, non-flammable nitrogen gas instead of resin or oil, with an overpressure disconnector acting on all three phases.

Its job is described in the datasheet as input and output filters in inverter systems and filtering of harmonic distortion in power inverters. In a drive panel that means the capacitor leg of an LC or LCL sine or grid filter, where high-frequency ripple current rather than 50 Hz reactive current dominates, which is why the datasheet quotes IRMS, peak current and series resistance instead of kvar.

Technical specification

Reading the ordering code

The datasheet’s ordering-code drawing identifies B3237 as the FilterCap MKD AC series, a terminal-type digit, G for gas-filled type, the first voltage figure, the capacitance (426 means 42 x 10 to the sixth pF, so 42 uF), the tolerance letter (J is +/-5 %, K is +/-10 %) and trailing digits for the coded capacitance value and accessories. The same sheet lists neighbouring codes at 1415/1000 V: B32377G1306J000 (3 x 30 uF) and B32377G1566J000 (3 x 56 uF).

Selection points for drive filters

• Match the capacitor to the filter design current: at 70 C ambient this code permits 27 A, at 60 C 58 A, a large difference that depends on cabinet temperature.
• With 1000 V RMS rating it is intended for networks and inverter outputs well above the 400 V class; check that the filter resonance and ripple stay inside the derating curve printed for this exact code.
• Terminal D takes a 35 mm2 cable without lug; plan cable routing accordingly.
• Order quantity follows the packing unit of 2.

Installation and environment

Mount the can upright on its M12 stud with terminals up. The datasheet allows horizontal mounting only after the user has assessed electrical and mechanical performance, because all approval tests were done vertical. Operating ambient ranges from -40 to +70 C, but the can must be cooled below +50 C before it is energised after storage at the upper limit. For use in GCC drive rooms, check temperature rise in the filter cabinet against the derating curve, since a ten-degree rise changes the allowed current substantially. The maximum altitude is 2000 m.

Typical GCC applications

Variable frequency drives for pumps, compressors and fans in oil and gas and water plants, solar inverters, and active front-end drives all use filter capacitors of this type. The unit is not a substitute for a PFC capacitor: its ratings are voltage and current oriented and the table gives no kvar figure. See the electrical and power category for line reactors and EMC filters that sit in the same drive panels.

Selection and installation notes

A power factor correction component is selected from the capacitor bank rating, the supply voltage and the network harmonics. Check the rated voltage and current against the actual duty, allow for the cooling and clearances on the data sheet, tighten the terminals to the torque on the data sheet and fit the protection the maker names. Where the network has strong harmonics, a detuned bank with reactors is the safer choice.

Information needed for a quotation

Send the full model code, the quantity, the delivery location in Oman or the GCC, the intended use and any accessories needed, so that the complete package can be quoted together.

Documents and supply information

The manufacturer data sheet is attached to this page and should be read together with the project specification and the site risk assessment before a purchase is confirmed. Ratings, standards and dimensions are quoted as printed on that sheet. Lead time, stock position and certificates available with the shipment are confirmed in the quotation, and we supply to Oman and the wider GCC region for industrial, utility and building services projects.

Frequently asked questions

Is B32377G1426J000 a power factor correction capacitor?

No. It is a FilterCap power electronic capacitor for inverter input and output filters, rated by voltage, RMS current and capacitance rather than by kvar.

What does the 426 in the code mean?

It is the coded capacitance: 42 x 10 to the sixth pF, which equals 42 uF per phase for this three-phase capacitor.

What is the maximum RMS current?

The datasheet lists 27 A at 70 C and 58 A at 60 C ambient, for a hot-spot of 85 C and a harmonic spectrum up to 10 kHz.

Is the datasheet final?

The datasheet is marked Preliminary and notes that UL approval is in progress, so check current approvals with TDK documents before ordering for certified equipment.

Who supplies this part in Oman?

Seven Star LLC is an independent supplier in Muscat and not the manufacturer. Confirm code and application before ordering.