Main Transformer

Assembly

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Underfloor oil-cooled transformer stepping 25-kV catenary down to traction and auxiliary windings.

Direct parts	6
Total parts	62
Used in	1 assembly
Class	Assembly

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Underfloor oil-cooled transformer stepping 25-kV catenary down to traction and auxiliary windings. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Main Transformer parts and their functions

6 top-level parts · 62 parts in total · full bill of materials below

Main Transformer parts diagram: 1 laminated transformer core, 2 copper winding, 3 oil tank housing, 4 transformer oil cooler, 5 coolant pump, 6 HV bushing. 62 parts in 6 top-level items. — Main Transformer 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	Laminated Transformer Core	1×
2	Copper Winding	4×	Primary + traction + aux windings
3	Oil Tank Housing	1×
4	Transformer Oil Cooler 3 parts	1×
5	Coolant Pump	1×	Electric or belt-driven centrifugal pump that circulates coolant through the engine, motor, battery, or heat exchanger.
6	HV Bushing	2×

3D model

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Build & assembly graph

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Bill of materials for Main Transformer

6 top-level lines · 12 rows shown · 62 parts total · indented to 3 levels

#	Item / sub-assembly	Part no.	Qty/assy	Ext. qty	Parts	Type
1	Laminated Transformer Core	commuter-emu-transformer-core	1×	1	·	part
2	Copper Winding	copper-winding	4×	4	·	part
3	Oil Tank Housing	commuter-emu-transformer-tank	1×	1	·	part
4	Transformer Oil Cooler 3 parts	commuter-emu-oil-cooler	1×	1	53	assembly
4.1	Radiator	radiator	1×	1	·	part
4.2	Oil Cooler Fan 3 parts	commuter-emu-cooler-fan	2×	2	24	assembly
4.2.1	Stator Assembly 3 parts + deeper ›	stator-assembly	1×	2	3	assembly
4.2.2	Rotor Assembly 4 parts + deeper ›	rotor-assembly	1×	2	19	assembly
4.2.3	Ball Bearing	ball-bearing	2×	4	·	part
4.3	Oil Seal	oil-seal	4×	4	·	part
5	Coolant Pump	coolant-pump	1×	1	·	part
6	HV Bushing	commuter-emu-bushing	2×	2	·	part

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Where the main transformer is used

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

Rail & Transit 1 Commuter EMU

Used in 1 assembly

Commuter EMU

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