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Home > Substations & Transformers > Wholesale JBK3 series machine tool control transformers Suppliers, Manufacturers
Wholesale JBK3 series machine tool control transformers Suppliers, Manufacturers
Wholesale JBK3 series machine tool control transformers Suppliers, Manufacturers
Wholesale JBK3 series machine tool control transformers Suppliers, Manufacturers
Wholesale JBK3 series machine tool control transformers Suppliers, Manufacturers
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Wholesale JBK3 series machine tool control transformers Suppliers, Manufacturers
Wholesale JBK3 series machine tool control transformers Suppliers, Manufacturers
Wholesale JBK3 series machine tool control transformers Suppliers, Manufacturers
Wholesale JBK3 series machine tool control transformers Suppliers, Manufacturers

Wholesale JBK3 series machine tool control transformers Suppliers, Manufacturers

All JBK3 series machine tool control transformers use pure oxygen-free copper coils coated with double-layer insulating varnish. They feature ultra-low wire loss, high resistance to oxidation, a long service life, and advanced manufacturing processes. With high magnetic permeability, their loss is far lower than national standards, achieving an internationally leading level in conversion efficiency.These transformers are widely used in 50–60 Hz AC circuits as control power supplies for electrical systems of machine tools and mechanical equipment, as well as power supplies for work lighting and signal lamps.

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Product Description

Type Designation
JBK3-4 Designation
1Machine tool transformer
2Control
3Design serial number
4Rated capacity (VA)
JBK3-5 Designation
1Single-phase
2Control
3Design serial number
4Rated capacity (VA)
Operating Conditions
  • Ambient air temperature: -5°C to +40°C, average not exceeding +35°C over 24 hours.
  • Installation altitude not exceeding 2000 meters.
  • Relative humidity: ≤50% at +40°C; higher humidity allowed at lower temperatures.
  • Maximum monthly average humidity: 90% with average minimum temperature of +25°C.
  • Free from severe vibration and mechanical shock.
  • Protected from rain and snow.
  • Supply voltage waveform approximately sinusoidal.
Product Display
JBK3 Series Control Transformers Front
JBK3 Series Control Transformers Back
Technical Parameters
Parameter Value
Efficiency≥95%
Insulation Resistance≥20 MΩ
Overload Capacity2x rated current for 1 minute
Dielectric Strength2000V AC for 1 minute (no breakdown/flashover)
Insulation ClassClass B (130°C), F (155°C), H (180°C)
Noise≤55 dB
Ambient Temperature-15°C to +40°C
Max Average Monthly Temp≤35°C
Installation Altitude<1000m
External and Installation Dimensions
JBK3 Dimensions Diagram
Model Bmax Dmax Emax Mounting Spacing Hole K or K×J Fmax
A C
JBK3-40/63VA78758956±0.451±24.8×912
JBK3-100VA85909164±0.468±24.8×912
JBK3-160VA969710584±0.473±25.8×1114
JBK3-250VA9610510584±0.485±25.8×1114
JBK3-400VA120105123103±0.482±27×1218
JBK3-630VA150105145128±0.586±27×1222
JBK3-1000VA160195145140±2158±27×1218
JBK3-1600VA180225155155±2180±27×1218
JBK3-2500VA200250171165±2210±27×1218
Frequently Asked Questions
What is the energy efficiency of the JBK3 series transformers?
The JBK3 series control transformers are highly efficient, maintaining an efficiency rating of ≥95% during operation.
What insulation classes are available for these transformers?
These transformers are available in multiple insulation classes to suit different requirements: Class B (130°C), Class F (155°C), and Class H (180°C).
What are the ambient temperature requirements for installation?
The recommended ambient air temperature ranges from -5°C to +40°C, with an average temperature not exceeding +35°C over any 24-hour period.
Can the JBK3 series handle temporary overloads?
Yes, these transformers feature an overload capacity that allows them to handle 2x the rated current for up to 1 minute.
What is the maximum altitude for standard operation?
The standard installation altitude should not exceed 2000 meters for optimal performance and safety.
Is the operation of these transformers loud?
No, the JBK3 series is designed for low-noise operation, with noise levels maintained at ≤55 dB.

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