Name: Busway Tap-off Box
Brand: ZHERUTONG
Availability: InStock
Rating: 5 (1 reviews)

Description

Busway Tap-off Box for Busbar Trunking Systems

Our busway tap-off box is an important accessory in a busbar trunking system. It is used at designated plug-in points to connect branch circuits and support power distribution to equipment, panels, and other downstream loads.

This product is designed with practical installation and maintenance requirements in mind. It provides internal space for cable connection and can accommodate protective devices according to project requirements. For busway systems that require flexible branch distribution, the tap-off box offers a reliable solution for electrical connection, disconnection, and circuit protection.

Key Features

Designed for Branch Power Distribution

The busway tap-off box is used to draw power from the main busbar trunking run and distribute it to branch circuits in industrial and commercial facilities.

Supports Plug-in and Bolted Connection Concepts

According to the current rating and system design, the product can be used in plug-in or bolted connection arrangements as described in the technical data below.

Space for Protective Devices and Cable Termination

The tap-off box is designed to accommodate protective devices and provide sufficient internal space for cable connection, helping simplify downstream distribution design.

Safety-Oriented Structure

The box is equipped with door locking and connection safety features as shown in the product data. These details support safer operation and help prevent improper opening or removal during use.

Technical Data

Plug-in Shunt System

To support power distribution applications, the RT-MYC wire busbar system uses a shunt box that can accommodate protective devices.

The plug-in system has undergone temperature rise and short-circuit testing and complies with the standards listed on this page:

Test standard: IEC439 Parts 1-1992; GB7251.2 Parts 1-1997

Rated current:

20A to 400A (plug-in or bolted connection)

400A to 800A (bolted connection type)

Rated voltage: 500VAC (50Hz)

Special requirements: available upon request

The position of the shunt box can be designed according to project requirements. A 3.6-meter standard linear component can accommodate up to three shunt points.

Plug-in electrical boxes can be installed or removed under the power supply state of the busbar. The electrical box itself provides enough space for wire connection. It is also equipped with dedicated interlock features to help prevent opening or removal during operation.

Safety Design

The grounding contact connects first to the wire busbar

Door locking is provided for the box

The connection between the wire harness and the electrical box includes safety-oriented locking design

Dimensions

The available dimensions vary according to the load current and protective switch arrangement.

Load Current of Plug-in Box	Length L (mm)	Width W (mm)	Depth H (mm)
50 to 250A load protection switch	500	330	270
250 to 400A load protection switch	550	450	340
400 to 630A load protection switch	650	450	340

Installation Diagram

Rated Current (A)	Minimum Size (mm)
Copper (Cu)	1250 and below
	310
	360

Rated Current (A)	Minimum Size (mm)
Copper (Cu)	1250 and below
	650
	700

Rated Current (A)	Minimum Size (mm)
Copper (Cu)	1250 and below
	450
	500

Spacing

If there are electrical boxes in adjacent wire transfer rows, the spacing between them must be increased

Load current of plug-in electrical box	Minimum spacing
Copper (Cu)	Millimeters (mm)
250 ampere load protection switch	210
250-400 ampere load protection switch	280
400-630 ampere load protection switch	480

Distance between wire transfer lines

Toensuresufficient heat dissipationand facilitateinstallation,thefollowingminimumspacing requirements must be followed for installation.

The distance required when passing through walls or floors

Copper	Minimum Spacing (mm)
400	L1: 640	L2:
500	L1: 640	L2:
630	L1: 640	L2:
800	L1: 640	L2:
1000	L1: 640	L2:
1250	L1: 640	L2:
1600	L1: 640	L2: 300
2000	L1: 660	L2:
2500	L1: 660	L2:
3200	L1: 680	L2:
4000	L1: 680	L2:
4500	L1: 680	L2:
5000	L1: 680	L2:
5500	L1: 680	L2:
6300	L1: 680	L2:

Applications

Our busway tap-off box is suitable for low-voltage power distribution projects using busbar trunking systems, including:

Industrial plants

Commercial buildings

Workshops

Distribution rooms

Facilities requiring branch power distribution from busway systems

FAQ

What is a bus duct tap box?

A bus duct tap box is a box-type accessory used with a bus duct or busbar trunking system to draw power from the main run and distribute it to branch circuits or downstream loads. In many projects, the terms bus duct tap box, busway tap-off box, and tap-off unit for busway are used for closely related products.

What is the difference between a tap box and a bus plug?

A bus plug usually refers to the plug-in unit that connects directly to the busway at a plug-in point. A tap box is a broader term that may refer to the enclosure or assembly used for power take-off and cable connection. In practical project discussions, the terms can overlap, but the exact meaning depends on the busway system design and the manufacturer’s product structure.

Need a busway tap-off box for your project?

Contact ZHERUTONG for technical documents, dimensional confirmation, and product matching support for your busbar trunking system.

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Busway Tap-off Box