Transformer Accessories Series

Low Voltage Bushings for Distribution Transformers

Q: What is a low voltage bushing in a transformer?

A low voltage bushing is an insulated pass-through component that transfers current from internal transformer windings to external conductors. A low voltage transformer bushing must provide insulation integrity, mechanical stability, and interface compatibility with terminals and mounting structures.

Q: What is the difference between ANSI porcelain bushing and DIN porcelain bushing?

ANSI porcelain bushing and DIN porcelain bushing differ mainly in dimensional conventions, interface geometry, and project standard context. In low voltage bushing selection, standard-system matching is critical to avoid installation mismatch and rework.

Q: When should epoxy bushing be preferred for a low voltage transformer bushing project?

Epoxy bushing configurations are often preferred when compact structure, dry-type interface behavior, and stable sealing performance are required. For many low voltage transformer bushing applications, epoxy options provide flexible interface adaptation for modern transformer designs.

Q: Are low voltage bushing values on this page final design values?

No. The low voltage bushing specification values shown are engineering reference ranges for pre-selection and RFQ preparation. Final low voltage transformer bushing configuration is confirmed by approved drawings and project-level technical agreement.

Q: Can low voltage bushings be customized for retrofit projects?

Yes. For retrofit work, low voltage bushing solutions are typically matched to existing tank openings and interface constraints. Provide old part photos, key dimensions, and terminal details so engineering can evaluate replacement feasibility.

High-performance secondary bushings designed for reliable current transfer. Available in HTN (High Temperature Nylon), Porous Resin, and Porcelain options, featuring multiple terminal configurations for utility and industrial distribution transformers.

High-Current Stability • Flexible Terminal Options • International Export Support

Request Quote View Specifications

Voltage Class 1.2 kV – 3.0 kV

Current Rating 600A – 5000A+

Insulation Material HTN / Resin / Epoxy

Product Definition

What Is a Low Voltage Transformer Bushing?

A low voltage bushing is a critical insulation component designed to facilitate high-current transfer from a transformer’s internal secondary windings to external systems. Our solutions utilize advanced HTN (High Temperature Nylon) and Porous Resin technologies to ensure thermal stability and leak-proof performance in demanding utility environments.

01
High Current Flow — Supports secondary side currents from 600A up to 5000A+ via optimized copper conductors.
02
Advanced Insulation — Employs Zytel® HTN or Porous Resin for superior mechanical strength and low moisture absorption.
03
Superior Sealing — Features tri-clamp or pressure plate mounting with resilient Buna-N gaskets for zero-leakage reliability.

ZeeyiElec specializes in HTN-molded and resin-dry bushings, providing drop-in replacements for standard OEM configurations.

Conventional Route

External Busbar / Cable

Terminal Threaded Stud

Insulation Porcelain Body

Mounting DIN / Standard Flange

Best for standard distribution projects with traditional requirements.

High-Performance Route

External High-Amp Palm/Spade

Terminal Spade / Plate Conn.

Insulation HTN / Porous Resin

Mounting Tri-Clamp / Plate

Optimized for high-current, low-profile, and humid environments.

Engineering Series

Product Family Overview

ZeeyiElec provides comprehensive low voltage bushing solutions categorized by insulation material and standard compliance.

REF: 3BE3-SERIES Series A

ZeeyiElec 1.2kV plastic HTN molded tri-clamp secondary bushing

Plastic Bushings

HTN Molded Tri-Clamp Type

Voltage Class1.2 kV

Current Rating600A / 1200A

MaterialZytel® HTN

MountingTri-clamp (3-Bolt)

Request Quote Specifications

REF: ANSI-STD-02 Series B

ANSI standard porcelain low voltage transformer bushing

ANSI Porcelain

American Standard Series

Voltage Class1.2 kV – 2.5 kV

Max Current6500 A

StandardIEEE / ANSI C57

TerminalsSpade / Stud / Palm

Request Quote Specifications

REF: DIN-42530 Series C

DIN standard wafer type porcelain low voltage bushing

DIN Porcelain

European Wafer Type

Voltage Range1.0 kV – 3.0 kV

Current Range315A – 6300A

ConfigurationWafer Type

SealingFull Ring Protection

Request Quote Specifications

REF: RESIN-DRY Series D

Epoxy Bushings

Resin Dry Type

MaterialPorous Resin / Epoxy

Max Current6500 A

FeatureLeak-Proof Dry Type

InterfaceFully Customizable

Request Quote Specifications

Engineering Specifications

Low Voltage Bushing Specifications by Family

Review key electrical, mechanical, and interface parameters across Plastic, ANSI Porcelain, DIN Porcelain, and Epoxy low voltage bushing families. Final dimensions and terminal details can be customized based on transformer design and project standards.

Family	Plastic Bushings
Typical Application	Transformer LV secondary pass-through
Voltage Class	1.2 kV
Current Rating	600A / 1200A
Withstand (1 min)	10 kV
Lightning Impulse (BIL)	30 kV
Insulation Material	HTN molded insulation body (Zytel®)
Conductor Interface	Copper stud (5/8″ or 1″)
Mounting Pattern	Tri-clamp (3-bolt pattern)
Sealing Structure	Gasket included (Buna-N)
Standard Reference	ANSI / IEEE C57.12.00
Typical Model	3BE3-600-1.2 / 3BE3-1200-1.2

Family	ANSI Porcelain Bushings
Typical Application	ANSI transformer LV terminals
Voltage Class	1.2 kV / 2.5 kV
Current Range	63A – 6500A
Withstand (1 min)	10 kV (1.2kV class) / 15 kV (2.5kV class)
Lightning Impulse (BIL)	30 kV / 45 kV
Creepage Distance	55 mm / 70 mm (typical)
Insulation Material	C-110 High-grade wet process porcelain
Conductor Interface	Spade / Stud / Palm-hole variants
Mounting Pattern	Threaded / bolt interface
Standard Reference	ANSI / IEEE system context

Family	DIN Porcelain Bushings
Typical Application	DIN-style distribution transformer terminals
Voltage Class	1.2 kV – 3.0 kV
Current Range	315A – 6300A
Configuration	Wafer type
Connection Types	Screw connected / T-type connected
Sealing Structure	Full sealing ring protection
Shield Option	Single shield / 2 shields (by model)
Mounting Pattern	Plate / screw route
Series References	BF / BFJ type references
Standard Reference	DIN 42530

Family	Epoxy Bushings (Resin Dry)
Typical Application	Compact transformer LV outlet interfaces
Voltage Class	Project-dependent LV class
Current Range	Up to 6500A (series dependent)
Insulation Material	Epoxy / Porous resin dry type
Mechanical Characteristic	High structural strength
Moisture Characteristic	Superior moisture resistance (low absorption)
Sealing Behavior	Dry-type, no oil-side porcelain body dependency
Maintenance Statement	Low maintenance / Long-term stability
Interface	Configurable terminal and mounting by project
Typical Model	LEB Series (Porous)

Values shown are engineering reference ranges for pre-selection and inquiry preparation.
Final dimensions, hole patterns, and terminal configurations are confirmed by approved drawings.
For retrofit projects, please provide transformer nameplate data, opening dimensions, and connection photos.

Recommended RFQ Inputs

Electrical Rating

Required current rating (A) & Voltage class.

Material Preference

Plastic / ANSI Porcelain / DIN / Epoxy.

Mounting Interface

Opening size & bolt pattern dimensions.

Terminal Type

Stud / Spade / Palm / Custom request.

Engineering Capability

Reliable Delivery for Every Project

ZeeyiElec streamlines the low voltage bushing supply chain with precise engineering coordination, from initial selection to final export documentation.

Application Matching

We align Plastic, Porcelain, or Epoxy routes directly to your transformer's interface requirements and current demands.

Design Verification

Every order includes a review of opening patterns, terminal forms, and mounting details before production begins.

Flexible Configuration

Full support for custom stud, spade, or palm options, along with adaptable sealing structures for any tank design.

Export Documentation

Comprehensive commercial and technical documentation coordination to ensure smooth international B2B delivery.

Note: Detailed engineering feedback is provided within 24 hours after reviewing your nameplate data and interface dimensions.

Application Scenarios

Where Low Voltage Bushings Are Commonly Applied

ZeeyiElec low voltage bushing families are used across distribution transformer projects with different interface standards, current levels, and service environments. Select the scenario closest to your project for faster engineering alignment.

Utility Distribution Transformers

Typical LV outlet interfaces for public grid distribution transformers requiring stable insulation and reliable current transfer.

ANSI / DIN
Outdoor Service
High Reliability

Recommended Families ANSI Porcelain / DIN Porcelain / Epoxy

Pole & Pad-Mounted Units

Compact transformer platforms where interface layout, sealing integrity, and maintenance access are critical.

Compact Envelope
Sealing Priority
Retrofit-Friendly

Recommended Families Epoxy / ANSI Porcelain

Industrial Power Distribution

Factory and plant transformers with higher load continuity requirements and project-specific terminal configurations.

Custom Terminals
High Current
Heavy Duty

Recommended Families ANSI Porcelain / DIN / Epoxy

Renewable & Auxiliary Systems

Transformer interfaces supporting renewable integration and auxiliary distribution systems with reliability-focused component selection.

Grid Integration
Documentation
Configurable

Recommended Families Epoxy / ANSI Porcelain

Retrofit & Replacement

Replacement cases requiring precise matching of opening dimensions, terminal style, and existing transformer interface constraints.

Opening Check
Drawing Match
Fast Feedback

Recommended Families Plastic / ANSI / DIN / Epoxy

LV Secondary Platforms

Secondary-side applications where compact mounting and cost-effective insulation structures are preferred.

Tri-clamp
1.2kV Class
600A/1200A

Recommended Families Plastic (HTN)

Selection Guide

How to Select the Right Low Voltage Transformer Bushing

This low voltage bushing selection guide helps you match application conditions, standard system, current demand, and mounting interface to the right low voltage transformer bushing family. Use this workflow to shortlist ANSI porcelain bushing, DIN porcelain bushing, epoxy bushing, or plastic bushing options before RFQ.

Confirm Application

Identify whether the low voltage bushing is used for utility distribution, industrial transformer output, or retrofit replacement.

Match Standard

Determine if the project follows ANSI or DIN conventions to avoid mismatch between bushing interface and tank design.

Check Electricals

Confirm rated current range and voltage class. Compare withstand values with project requirements before model confirmation.

Choose Family

Shortlist plastic bushing, ANSI porcelain bushing, DIN porcelain bushing, or epoxy bushing based on material preference.

Submit RFQ

Submit nameplate data and opening dimensions. Engineering uses these inputs to finalize the low voltage transformer bushing recommendation.

Which Low Voltage Bushing Family Fits Best?

Plastic Bushing

HTN Series

1.2kV class projects
600A / 1200A needs
Tri-clamp mounting

Best fit for compact low voltage bushing secondary outlets.

ANSI Porcelain

American Std

ANSI transformer jobs
Wide current span
Porcelain preference

Common choice for low voltage transformer bushing projects under ANSI.

DIN Porcelain

European Std

DIN style interfaces
Wafer configuration
Screw/T-type routes

Recommended when DIN porcelain bushing geometry is required.

Epoxy Bushing

Resin Dry Type

Compact designs
Dry-type interface
Moisture sensitive

Practical low voltage bushing option for resin-based interfaces.

Low Voltage Bushing RFQ Checklist

Transformer type and application

Required current rating (A)

Preferred family (Plastic / ANSI / DIN / Epoxy)

Tank opening dimensions and bolt pattern

Terminal form (stud / spade / palm / custom)

Quantity and target lead time

Get Engineering Selection Support Review Specifications

Quality & Documentation

Low Voltage Bushing Quality Control and Documentation Support

For each low voltage bushing project, ZeeyiElec aligns material route, interface details, and outgoing inspection with project requirements. Documentation support is provided to help buyers and engineers evaluate low voltage transformer bushing suitability before order release and shipment.

Quality Control Logic

Quality control for each low voltage bushing family follows a practical engineering sequence: material verification, dimensional check, and interface consistency review. For ANSI porcelain bushing and DIN porcelain bushing routes, dimensional tolerances are prioritized. For epoxy bushing and plastic bushing routes, insulation integrity is key.

Material and component consistency check
Critical dimension and mounting pattern verification
Terminal/interface match confirmation
Visual inspection before final packing

Documentation Package

To support low voltage transformer bushing procurement and project alignment, ZeeyiElec can provide a documentation package based on project stage and customer requirements. This helps reduce communication cycles and improves engineering handoff efficiency.

Technical datasheet (family-level)
Dimensional drawing / outline reference
Quotation sheet with configuration notes
Packing list and commercial invoice
Origin-related commercial documents (as requested)
Additional project coordination files

Pre-Production Review Inputs

Transformer application and voltage class
Required current rating
Preferred low voltage bushing family
Opening dimensions / bolt pattern
Terminal form requirement

Pre-Shipment Verification Focus

Model-family and quantity consistency
Visual condition and marking check
Interface/mounting correspondence
Packaging protection status
Document completeness check

FAQ & Resources

Common Questions & Technical References

Clear answers on interface definition, selection boundaries, and compatibility, plus quick access to official standards.

Related Resources

Internal Category: Explore Transformer Accessories
External Standard: Electrical Safety Reference

What is a low voltage bushing in a transformer?

A low voltage bushing is an insulated pass-through component that transfers current from internal transformer windings to external conductors. A low voltage transformer bushing must provide insulation integrity, mechanical stability, and interface compatibility with terminals and mounting structures.

How do I choose between plastic, porcelain, and epoxy bushing?

Selection depends on current level, interface standard, mounting pattern, and service environment. Plastic bushing options are common for compact secondary interfaces, while ANSI porcelain bushing, DIN porcelain bushing, and epoxy bushing routes are typically selected for broader current ranges and project-specific transformer interface requirements.

Difference between ANSI and DIN porcelain bushing?

ANSI porcelain bushing and DIN porcelain bushing differ mainly in dimensional conventions, interface geometry, and project standard context. In low voltage bushing selection, standard-system matching is critical to avoid installation mismatch and rework.

When to prefer epoxy bushing for a project?

Epoxy bushing configurations are often preferred when compact structure, dry-type interface behavior, and stable sealing performance are required. For many low voltage transformer bushing applications, epoxy options provide flexible interface adaptation for modern transformer designs.

Are listed bushing values final design values?

No. The low voltage bushing specification values shown are engineering reference ranges for pre-selection and RFQ preparation. Final low voltage transformer bushing configuration is confirmed by approved drawings and project-level technical agreement.

What data is needed for a bushing quote?

Please provide current rating, voltage class, preferred family (plastic, ANSI porcelain, DIN porcelain, or epoxy), opening dimensions, terminal style, quantity, and destination. These inputs significantly improve transformer bushing selection speed and accuracy.

Can bushings be customized for retrofits?

Yes. For retrofit work, low voltage bushing solutions are typically matched to existing tank openings and interface constraints. Provide old part photos, key dimensions, and terminal details so engineering can evaluate replacement feasibility.

What standards apply to these bushings?

Projects commonly reference ANSI/IEEE context, DIN system context, or IEC/GB project specifications depending on market and transformer platform. The key in low voltage transformer bushing selection is consistency between project standard, dimensions, and interface design.

Do you provide documentation?

Yes, documentation support can include technical datasheets, dimensional references, quotation details, packing list, and commercial documents as required by the project stage and destination market.

How fast is engineering confirmation?

Engineering response time depends on completeness of your RFQ inputs. In most cases, when current rating, dimensions, and interface requirements are clear, preliminary low voltage bushing family recommendations can be provided efficiently for quotation alignment.