A JBK Series machine tool control transformer is a dry-type control transformer designed to provide suitable control and auxiliary power for machine tools, CNC machines, industrial automation equipment, electrical control panels and other industrial systems. It converts the available input voltage to the required control voltage while providing electrical isolation between the primary and secondary circuits when an isolated winding configuration is specified.

JBK control transformers are commonly used to supply power to contactors, relays, solenoid valves, electromagnetic components, PLC-related circuits, indicators, control devices and other auxiliary loads. The transformer can be configured according to the machine’s voltage, VA capacity, frequency, installation space and wiring requirements.

Voltnex Power supplies customized JBK Series machine tool control transformers for OEM equipment manufacturers, automation integrators, control-panel builders and industrial distributors.

JBK control transformers are primarily used for industrial control and auxiliary power applications where a stable and suitable control voltage is required.

Typical applications include:

• CNC machine tools
• Conventional machine tools
• Industrial automation equipment
• Electrical control cabinets
• Machine control panels
• Factory production machinery
• Motor control systems
• Relay and contactor circuits
• Solenoid and electromagnetic devices
• PLC control systems
• Industrial lighting and auxiliary circuits
• Packaging machinery
• Textile machinery
• Metalworking equipment
• Automated production lines

The transformer can step down or otherwise convert the available supply voltage to a lower control voltage suitable for the machine’s control circuit.

The main difference is the intended application and electrical design.

A standard power transformer is generally designed to transfer larger amounts of electrical power for distribution or equipment power supply. A JBK control transformer is optimized for control circuits and auxiliary loads, where voltage stability, electrical isolation, compact installation and the ability to handle control-circuit inrush loads are important.

JBK control transformers are typically installed inside or alongside machine control cabinets, CNC equipment, electrical panels and industrial automation systems. Their VA ratings are generally selected according to the control load rather than the main motor power of the machine.

For example, a large CNC machine may use a relatively small control transformer to supply its contactors, relays, solenoids, control electronics and other auxiliary circuits.

JBK Series machine tool control transformers can be manufactured with different primary and secondary voltages according to the application.

Common industrial primary voltages include:

220V, 380V, 400V, 415V, 440V, 480V and 660V

Common control voltages may include:

12V, 24V, 36V, 110V, 115V, 120V, 220V and other customized voltages.

The actual voltage combination should be selected according to the machine’s electrical schematic and control-circuit requirements. Voltnex Power can customize the primary voltage, secondary voltage, frequency, VA rating, terminal configuration and mounting dimensions for different industrial equipment.

For international OEM projects, the transformer can also be configured according to the electrical requirements of the destination market.

The correct VA rating should be selected based on the total continuous control load plus the inrush VA requirements of components such as contactors, relays, solenoids and electromagnetic devices.

A basic selection process is:

Transformer VA Rating ≥ Continuous VA Load + Allowance for Inrush VA

Simply adding the wattage of every control component may not provide an accurate transformer size because some inductive control devices can draw considerably higher current during energization.

For a machine tool control transformer, it is important to consider:

• Continuous control load
• Contactor pickup VA
• Solenoid inrush current
• Relay coil requirements
• Motor starter requirements
• Simultaneous energization
• Control voltage
• Duty cycle
• Future load expansion

Voltnex Power can help select the appropriate JBK transformer capacity based on the customer’s electrical schematic, load list or equipment specifications.

Yes. Custom JBK control transformers for CNC machines are one of the important applications of this product family.

For OEM CNC equipment, the transformer can be customized according to the available installation space and electrical design. Customization may include:

• Primary voltage
• Secondary voltage
• VA capacity
• 50Hz or 60Hz frequency
• Copper or other specified winding materials
• Insulation class
• Terminal configuration
• Terminal quantity
• Mounting holes
• Mounting dimensions
• Transformer height and width
• Lead-wire configuration
• Enclosure requirements
• Nameplate information

This makes the JBK Series suitable for CNC machine builders that require a control transformer to fit a specific control cabinet or machine electrical system.

A properly designed isolating control transformer provides galvanic isolation between the primary and secondary windings.

This means there is no direct conductive connection between the primary and secondary circuits when they are electrically separated windings. Isolation can help separate the control circuit from the incoming power circuit and is commonly used for machine control and auxiliary power applications.

The actual insulation system and dielectric performance depend on the transformer design and specified requirements. For applications where electrical isolation is critical, the required insulation level, dielectric withstand voltage and applicable standard should be confirmed before production.

For industrial automation and machine-tool applications, an isolated control transformer can be an important part of the overall electrical protection and control architecture.

Yes. JBK Series control transformers are suitable for many industrial automation and electrical control applications.

They can provide control power for:

• PLC control systems
• Contactors
• Relays
• Solenoid valves
• Electromagnetic brakes
• Control switches
• Sensors and auxiliary devices
• Machine interface circuits
• Industrial indicators
• Automation control panels

The transformer is typically integrated into a control cabinet or machine electrical system. The required output voltage and VA capacity should be selected based on the actual automation circuit.

For automated production lines, the control transformer can be designed together with the control cabinet’s voltage, terminal arrangement and available mounting space.

JBK, BK and JMB are commonly used Chinese industrial control-transformer designations, but their exact specifications and naming conventions can vary by manufacturer and market.

In a typical product classification:

• BK Series – general low-voltage control transformers for industrial machinery and electrical control circuits.
• JBK Series – machine tool control transformers commonly associated with machine tools, CNC equipment and control cabinets.
• JMB Series – commonly used for lighting and control applications, including auxiliary lighting circuits.

For international customers, it is more useful to specify the actual input voltage, output voltage, VA rating, frequency, insulation requirements and application rather than relying only on the model designation.

Voltnex Power can manufacture the appropriate control transformer according to the customer’s electrical requirements and application.

Yes. JBK control transformers are commonly used to supply control power to contactors, relays, solenoid valves and other electromagnetic control components.

However, the transformer must be correctly sized for both the normal operating load and the temporary inrush current generated when inductive devices are energized.

For example, if several contactors or solenoids can be energized simultaneously, their pickup VA should be included when selecting the transformer capacity. A transformer that is sized only according to the steady-state VA may experience excessive voltage drop during simultaneous starting.

Providing the contactor model, coil voltage, quantity and simultaneous operating conditions allows the transformer VA rating to be selected more accurately.

JBK Series control transformers can be designed for 50Hz or 60Hz industrial power systems.

The frequency should be specified when ordering because transformer magnetic design, losses and operating characteristics are related to the operating frequency.

For export applications, customers should provide the electrical system requirements of the destination country or machine. Voltnex Power can configure JBK control transformers for different international voltage and frequency requirements.

For example, a transformer for a 60Hz North American industrial machine may require a different specification from a transformer intended for a 50Hz European or Asian machine.

Yes. Voltnex Power provides OEM and ODM manufacturing of JBK Series machine tool control transformers for industrial equipment manufacturers, automation companies, electrical panel builders and distributors.

Custom engineering can cover:

• Voltage conversion
• VA rating
• Winding configuration
• Copper winding
• Frequency
• Insulation class
• Terminal arrangement
• Lead-wire length
• Mounting dimensions
• Mounting holes
• Nameplate
• Protective enclosure
• Mechanical structure
• Packaging requirements

For OEM projects, customers can provide an existing transformer sample, electrical drawing, technical specification, nameplate information or installation dimensions. The transformer can then be developed according to the required electrical and mechanical parameters.

The applicable standard depends on the destination market, transformer design and customer’s technical requirements.

For machine-tool and industrial control transformer applications, standards such as IEC 61558-2-2 may be relevant to the safety requirements for control transformers, while other IEC, UL or customer-specific requirements may apply depending on the project.

For export orders, the required certification and compliance should be confirmed before production. Voltnex Power can discuss applicable standards, insulation requirements, dielectric withstand testing, temperature-rise requirements and other technical specifications with customers.

If a customer requires a transformer for a specific market such as the USA, Canada, Europe, Australia or other regions, the required compliance requirements should be specified during the quotation stage.

Each JBK control transformer should undergo appropriate quality-control and electrical testing according to its design and applicable requirements before shipment.

Typical transformer inspection and testing may include:

• Winding resistance testing
• Insulation resistance testing
• Dielectric withstand testing
• Voltage ratio verification
• No-load current testing
• Output-voltage verification
• Terminal and wiring inspection
• Visual and dimensional inspection
• Nameplate verification
• Mechanical mounting inspection

For OEM and bulk orders, additional inspection and testing requirements can be discussed according to the customer’s quality specification.

The goal is to ensure that the finished machine tool control transformer meets the specified electrical, mechanical and application requirements before delivery.

Voltnex Power supplies custom JBK Series machine tool control transformers directly from the manufacturer and factory for industrial customers, OEM equipment manufacturers, control-panel builders, automation companies, distributors and wholesale buyers.

Customers can request customized specifications for CNC machines, machine tools, industrial automation systems, control cabinets and auxiliary power applications.

For a quotation, provide as much of the following information as possible:

• Primary voltage
• Secondary voltage
• VA rating or estimated load
• 50Hz or 60Hz
• Single-phase or required configuration
• Insulation requirements
• Terminal configuration
• Mounting dimensions
• Quantity
• Application
• Destination country
• OEM or standard requirement

Based on these details, the manufacturer can recommend a suitable JBK control transformer configuration and provide a quotation for custom, OEM, ODM, wholesale and bulk orders.