25VA–100KVA Industrial Control & Auxiliary Power Solutions
Voltnex Power BK Series Industrial Control Transformers are dry type transformers designed to provide reliable auxiliary power for industrial machinery, electrical control cabinets, CNC equipment, automation systems, PLC circuits, relays, contactors, motor starters and other control applications.
The BK Series can be manufactured with customized primary and secondary voltages, rated capacity, frequency, winding materials, insulation class, terminals, mounting dimensions and enclosure configurations. Standard and custom designs are available for equipment manufacturers, electrical panel builders, system integrators, distributors and industrial projects.
Factory Direct | Custom Engineering | OEM / ODM | Wholesale Supply
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BK Series Control Transformer Overview
The BK Series is an industrial control power transformer developed for applications where a dedicated control voltage is required from the available electrical supply.
It uses electromagnetic induction to transfer electrical energy between primary and secondary windings while providing the required control voltage for connected equipment. The transformer can be configured to match different machine power systems and control circuit requirements.
Typical applications include industrial machinery, CNC machines, machine control panels, PLC and relay circuits, contactors, motor starters, solenoid devices, indicator lamps and auxiliary electrical systems.
Voltnex Power manufactures BK Series transformers for both standard applications and OEM equipment integration.
Key Features
Reliable Control Power
Provides a dedicated AC power source for industrial control circuits and auxiliary electrical equipment.
Dry Type Construction
Dry type construction eliminates the need for transformer oil and is suitable for installation inside electrical cabinets, control panels and industrial equipment.
Custom Voltage Configuration
Primary and secondary voltage combinations can be manufactured according to equipment and control circuit requirements.
Wide Capacity Range
BK Series transformers are available across a wide VA and kVA range for small control circuits through larger industrial auxiliary power applications.
Multiple Insulation Options
Insulation systems can be selected according to operating temperature, equipment requirements and application conditions.
Flexible Installation
Mounting dimensions, terminals, lead configurations and mechanical construction can be customized for equipment integration.
OEM & ODM Manufacturing
Voltnex Power supports custom engineering, private-label manufacturing, equipment integration and bulk production.
BK Series Technical Specifications
*Actual capacity and configuration depend on the selected BK model and application requirements.
Available Primary & Secondary Voltages
BK Series control transformers can be configured for different industrial power and control voltage systems.
Common Primary Voltages
- 110V
- 120V
- 208V
- 220V
- 230V
- 240V
- 380V
- 400V
- 415V
- 440V
- 480V
- 575V
- 600V
- 660V
Common Secondary Voltages
- 12V
- 24V
- 36V
- 48V
- 110V
- 115V
- 120V
- 220V
- Other custom control voltages
The actual primary-to-secondary voltage combination should be selected according to the machine power supply and control circuit design.
BK Control Transformer Applications
Industrial Machinery
BK Series transformers provide auxiliary control power for industrial machinery, including machine control circuits, relays, contactors, starters and electrical accessories.
CNC Machines
Suitable for CNC equipment requiring dedicated control power for controllers, relays, contactors, sensors, signal devices and auxiliary circuits.
Electrical Control Cabinets
Designed for installation inside electrical control panels and cabinets where a reliable control voltage is required.
PLC & Relay Systems
Provides AC control power for PLC-related circuits, relays, interface devices and other automation components.
Contactors & Motor Starters
Control transformers can supply the required coil voltage for contactors, motor starters and electromagnetic control devices.
Industrial Automation
Suitable for automation equipment, production lines, conveyors, robotic systems and machine control applications.
Machine Lighting & Signal Systems
Can supply dedicated control power for machine lamps, indicator lights, alarm towers, push buttons and signal circuits.
BK Series Control Transformer Model Selection
Selecting the correct control transformer requires more than matching the input voltage. The transformer should be selected according to the control voltage, connected load, inrush current, installation environment and available space.
1. Determine the Primary Voltage
Confirm the voltage available from the machine or industrial electrical system.
Common systems include 208V, 220V, 380V, 400V, 415V, 440V, 480V and other custom voltages.
2. Determine the Required Secondary Voltage
Identify the voltage required by the control components.
For example, a control circuit may require 24V, 48V, 110V, 120V or 220V AC.
3. Calculate the Required VA Rating
Add the power requirements of all continuously operating control components.
For equipment containing contactors, solenoids, relays or other inductive devices, the starting or inrush VA should also be considered.
4. Check Inrush Requirements
Some control components temporarily draw significantly higher current when energized.
The transformer should have sufficient capacity to maintain the required control voltage during this period.
5. Confirm Installation Dimensions
For control cabinet and machine installation, check:
- Overall transformer dimensions
- Mounting hole spacing
- Terminal position
- Lead length
- Clearance
- Ventilation space
6. Confirm Environmental Requirements
Operating temperature, humidity, enclosure requirements, insulation class and installation conditions should be considered when selecting the final configuration.
Custom BK Industrial Control Transformer
Designed Around Your Equipment
Standard control transformer specifications do not always match the electrical and mechanical requirements of OEM machinery.
Voltnex Power provides custom BK Series transformer manufacturing based on customer drawings, electrical specifications and equipment requirements.
Custom Rated Capacity
Specify the required VA or kVA rating according to the control circuit load.
Custom Primary & Secondary Voltage
We can configure transformer windings for different input and output voltage combinations.
Custom Frequency
50Hz and 60Hz designs are available for different international electrical systems.
Copper or Aluminum Windings
Winding material can be selected according to electrical performance, cost and project requirements.
Custom Insulation Class
B, F and H class insulation options can be provided according to operating temperature and application requirements.
Custom Dimensions
Mechanical dimensions can be adjusted for installation inside machine cabinets, control panels and electrical equipment.
Custom Terminals
Terminal arrangement, connection method, lead length and terminal configuration can be customized.
OEM / ODM
Voltnex Power supports OEM and ODM manufacturing for equipment manufacturers, distributors and industrial system integrators.
BK Transformer Construction
High-Quality Magnetic Core
The magnetic core is selected to provide stable transformer performance and efficient electromagnetic energy transfer.
Precision Copper or Aluminum Windings
Windings are manufactured according to the required voltage, current and rated capacity to provide consistent electrical performance.
Insulation System
Insulation materials are selected according to the required insulation class and operating conditions.
Secure Mechanical Structure
The transformer assembly is designed for reliable mounting and integration into industrial equipment and control cabinets.
Clearly Identified Terminals
Terminal markings and connection configurations help simplify installation and maintenance.
BK Control Transformer Testing
Before shipment, BK Series transformers can be inspected according to the applicable product specification and customer requirements.
Winding Resistance Test
Checks winding resistance and helps verify winding consistency.
Insulation Resistance Test
Checks insulation resistance between windings and ground.
Dielectric Withstand Test
Verifies insulation strength under the specified test voltage.
No-Load Test
Checks no-load current and transformer operating characteristics.
Visual Inspection
Checks transformer construction, terminals, labeling, mounting points and overall appearance.
Dimensional Inspection
Confirms overall dimensions and mounting dimensions according to the approved drawing or specification.
BK Series Dimensions & Installation
BK Series transformers are available in different mechanical configurations according to rated capacity and electrical design.
For OEM applications, Voltnex Power can provide dimensional drawings showing:
- Overall length
- Overall width
- Overall height
- Mounting hole spacing
- Mounting hole diameter
- Terminal positions
- Connection configuration
- Required installation clearance
For a replacement transformer or equipment integration project, customers can provide the original transformer dimensions or drawing so that the new BK Series transformer can be manufactured to fit the existing installation.
Contact Voltnex Power for a dimensional drawing of the required BK model.
Why Choose Voltnex Power?
China Industrial Transformer Manufacturer
Voltnex Power manufactures industrial transformers and power conditioning equipment for machinery, automation, electrical systems and industrial applications.
Our BK Series control transformers are supplied to equipment manufacturers, electrical panel builders, distributors, system integrators and industrial customers requiring standard or customized control power solutions.
Factory Direct Supply
Direct manufacturer supply helps simplify communication, technical confirmation and bulk purchasing.
Custom Engineering
Transformer specifications can be developed according to electrical drawings, equipment requirements and installation dimensions.
OEM & ODM Support
We support private-label production, customized specifications and long-term OEM manufacturing.
Quality Inspection
Electrical and dimensional inspections can be performed according to product specifications and customer requirements.
Global Supply
Voltnex Power provides industrial transformer solutions for customers and projects in North America, South America, Europe, Asia, Africa and other international markets.
BK Series vs JBK Series Control Transformers
BK and JBK are both designed for industrial control applications, but their typical application focus is different.
For general industrial control and auxiliary power, the BK Series provides a flexible platform. For machine tools and CNC equipment with specific machine-control requirements, the JBK Series may be configured for that application.
View JBK Series Control Transformer →
Frequently Asked Questions
What is a BK Series industrial control transformer?
The BK Series is a dry type industrial control transformer designed to provide AC control and auxiliary power for industrial machinery, electrical cabinets, automation equipment and control circuits.
What is the capacity range of BK Series transformers?
The BK Series can be manufactured across a wide capacity range. The available rating depends on the specific model and application. Custom VA and kVA ratings can also be discussed for OEM projects.
What input voltages are available?
Common primary voltages include 110V, 120V, 208V, 220V, 240V, 380V, 400V, 415V, 440V, 480V, 575V and 600V. Other voltages can be customized.
What output voltages are available?
Common secondary voltages include 12V, 24V, 36V, 48V, 110V, 120V and 220V AC. Custom secondary voltages are available.
Is the BK Series single phase or three phase?
BK transformers can be designed in single-phase or three-phase configurations depending on the required electrical system and transformer capacity.
How do I calculate the required control transformer VA?
Calculate the total continuous VA of the control circuit and consider the inrush VA of contactors, solenoids, relays and other inductive loads. The selected transformer should have sufficient capacity for both normal operation and starting conditions.
Can the BK transformer be customized?
Yes. Voltnex Power can customize rated capacity, primary voltage, secondary voltage, frequency, winding material, insulation class, dimensions, terminals and mounting configuration.
Can BK transformers be used inside electrical control cabinets?
Yes. Dry type BK Series transformers can be designed for installation inside industrial electrical cabinets and control panels, subject to the required ventilation, clearance and environmental conditions.
What is the difference between BK and JBK transformers?
BK is intended as a general industrial control transformer series, while JBK is specifically positioned for machine tools, CNC equipment and related machine-control applications.
Can you manufacture a transformer according to our drawing?
Yes. Customers can provide electrical specifications, transformer drawings, installation dimensions or an existing transformer nameplate. Voltnex Power can evaluate the requirements for a custom design.
What winding materials are available?
Copper and aluminum winding configurations can be supplied depending on the required electrical performance, cost and project requirements.
What insulation classes are available?
B, F and H class insulation options can be considered according to the transformer design and operating environment.
Can you provide OEM and ODM service?
Yes. Voltnex Power provides OEM and ODM manufacturing for equipment manufacturers, distributors, system integrators and industrial projects.
What information is needed for a quotation?
For an accurate quotation, please provide the required primary voltage, secondary voltage, rated VA/kVA, frequency, phase, quantity, installation dimensions and application. A technical drawing or existing transformer nameplate is also helpful.
Can you supply BK transformers for wholesale orders?
Yes. Voltnex Power supports wholesale, distributor and OEM orders with standard and customized transformer configurations.
Request a Custom BK Series Control Transformer
Need a control transformer for your machine, CNC equipment, control cabinet or automation system?
Send us your:
Primary Voltage + Secondary Voltage + VA/kVA + Frequency + Phase + Quantity + Application + Dimensions
Our engineering team can recommend a suitable BK Series configuration or develop a custom transformer according to your equipment requirements.
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Recensioni
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