Name: DIN 20NF630A Transformer Bushing 440mm Creepage
Brand: Pingxiang Risheng Electric Porcelain Co., Ltd.

High Voltage Transformer Bushings production

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DIN 20NF630A Transformer Bushing 440mm Creepage

Product Overview

A DIN-pattern 20NF630A outdoor bushing for 20/24 kV transformers carrying up to 630 A. It brings the winding lead through the tank wall and holds it against the mechanical pull of the external connection. The 440 mm creepage distance is the figure to check against your site pollution level, and the 6.1 kg weight keeps the terminal board load modest for a 630 A part.

Why Buyers Choose This Part

630 A continuous rating covers the larger distribution transformer sizes
440 mm creepage suits normally polluted outdoor air without an extended shed
Dual 20/24 kV rating lets one part number serve two network voltages
125 kV BIL with 50 kV wet withstand on a 385 mm tall body

Where It Is Used

20 kV and 24 kV distribution transformers up to 630 A terminal current
Substation transformers where the DIN terminal pattern is already standardised
Export orders that must match an existing DIN 20NF630A fitting
Stock holding for transformer builders serving European specifications

Who It Suits

Transformer manufacturers building to DIN terminal patterns
Distributors supplying European and Middle Eastern utility projects
Maintenance teams matching an installed DIN bushing footprint

What Goes Wrong Without The Right Part

Sourcing a 630 A bushing that still drops into the DIN mounting pattern
Creepage that is too short for the site and starts tracking within a season
Mixed 20 kV and 24 kV fleets that would otherwise need two part numbers
Conductor joints that heat because the bushing stem is undersized for 630 A

How It Is Built

Rated 20/24 kV at 630 A
440 mm nominal creepage distance
125 kV BIL, 50 kV wet power frequency withstand
385 mm height and 165 mm diameter
6.1 kg net weight
Porcelain shell with copper or aluminium alloy conductor

Published Figures For This Product

Every value below comes from the manufacturer data for this item. Figures not listed are confirmed against the drawing before an order is placed.

Nominal Creepage Distance	440 mm
Net Weight	6.1 kg
Height	385 mm
Diameter	165 mm
Rated Voltage	20/24 kV
Rated Current	630 A
BIL	125 kV
Power Frequency Withstand Voltage Wet	50 kV

Materials

Alumina electrical porcelain shell
Electrolytic copper or aluminium alloy conductor

Process

Porcelain forming
Glaze and fire
Conductor machining
Assembly and sealing
Electrical routine test

Testing

Creepage distance verified against the 440 mm drawing figure
Power frequency withstand test at 50 kV wet
Contact resistance check on the 630 A conductor path

Certification

ISO 9001 quality management system

Customisation Options

Alternative creepage distances on request
Copper or aluminium alloy conductor to suit your busbar metal
Customer marking under OEM or ODM arrangements

How It Compares

DIN 20NF250A	Same voltage class, but the 630 A conductor path handles roughly two and a half times the continuous current, so it belongs on larger transformer ratings.
DIN 24KV630A CD525	Shorter creepage at 440 mm against 525 mm. Choose this one for ordinary outdoor air and the CD525 where salt or industrial fallout is heavy.

Before You Order And After It Arrives

Confirm the 165 mm diameter clears your terminal board cut-out
Match the conductor metal to the cable lug to avoid a bimetallic joint
Keep the shed surface clean during storage so the glaze is not scratched
Support the body during transport, do not let it hang on the stem