JBK3 series machine tool control transformers

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.

product details

Type Designation

1	Machine tool transformer
2	Control
3	Design serial number
4	Rated capacity (VA)

1	Single-phase
2	Control
3	Design serial number
4	Rated 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 machine tool control transformers back

Technical Parameters

Parameter	Value
Efficiency	≥95%
Insulation Resistance	≥20 MΩ
Overload Capacity	2x rated current for 1 minute
Dielectric Strength	2000V AC for 1 minute (no breakdown/flashover)
Insulation Class	Class 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 Dimensions and Installation Dimensions

JBK3 Series Control Transformers Dimensions

Model	Bmax	Dmax	Emax	Mounting Hole Spacing		Mounting Hole K or K×J	Fmax
Model	Bmax	Dmax	Emax	A	C	Mounting Hole K or K×J	Fmax
JBK3-40/63VA	78	75	89	56±0.4	51±2	4.8×9	12
JBK3-100VA	85	90	91	64±0.4	68±2	4.8×9	12
JBK3-160VA	96	97	105	84±0.4	73±2	5.8×11	14
JBK3-250VA	96	105	105	84±0.4	85±2	5.8×11	14
JBK3-400VA	120	105	123	103±0.4	82±2	7×12	18
JBK3-630VA	150	105	145	128±0.5	86±2	7×12	22
JBK3-1000VA	160	195	145	140±2	158±2	7×12	18
JBK3-1600VA	180	225	155	155±2	180±2	7×12	18
JBK3-2500VA	200	250	171	165±2	210±2	7×12	18