Precharge & Isolation

Assembly

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Contactor and resistor network that soft-charges the DC bus through the IGBT body diodes before closing onto the grid.

Direct parts	4
Total parts	8
Used in	1 assembly
Class	Assembly

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Contactor and resistor network that soft-charges the DC bus through the IGBT body diodes before closing onto the grid. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Precharge & Isolation parts and their functions

4 top-level parts · 8 parts in total · full bill of materials below

Precharge & Isolation parts diagram: 1 main contactor, 2 precharge contactor, 3 precharge resistor, 4 semiconductor fuse. 8 parts in 4 top-level items. — Precharge & Isolation parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.

#	Part	Qty	What it does
1	Main Contactor	1×	Three-pole contactor connecting the filter to the bus once the DC link is charged.
2	Precharge Contactor	1×	Auxiliary contactor routing inrush through the precharge resistors.
3	Precharge Resistor	3×	Wirewound resistor limiting capacitor inrush at connection.
4	Semiconductor Fuse	3×	Ultra-fast fuse protecting the IGBT bridge against internal faults.

3D model

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Build & assembly graph

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Bill of materials for Precharge & Isolation

4 top-level lines · 4 rows shown · 8 parts total · indented to 3 levels

#	Item / sub-assembly	Part no.	Qty/assy	Ext. qty	Parts	Type
1	Main Contactor	harmonic-filter-main-contactor	1×	1	·	part
2	Precharge Contactor	harmonic-filter-precharge-contactor	1×	1	·	part
3	Precharge Resistor	harmonic-filter-precharge-resistor	3×	3	·	part
4	Semiconductor Fuse	harmonic-filter-semiconductor-fuse	3×	3	·	part

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Where the precharge & isolation is used

1 product across 1 domain contain it, directly or inside a sub-assembly

Power & Energy 1 Active Harmonic Filter

Used in 1 assembly

Active Harmonic Filter

Sourcing: possible vendors

Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $0.50–$100. How estimates work

Vendor	HQ	Specialty	MOQ	Lead time
🇨🇳Foxconn foxconn.com ↗	Shenzhen, CN	Electronics contract mfg	1,000 pcs	6–10 wks
🇸🇬Flex (Singapore) flex.com ↗	Singapore	Electronics contract mfg	1,000 pcs	6–10 wks
🇮🇳Dixon Technologies dixoninfo.com ↗	Noida, IN	Electronics contract mfg	1,000 pcs	6–10 wks
🇨🇳BYD Electronics bydelectronic.com ↗	Shenzhen, CN	Electronics contract mfg	1,000 pcs	6–10 wks
🇸🇬Venture Corp venture.com.sg ↗	Singapore	Electronics contract mfg	1,000 pcs	6–10 wks