BK Series Industrial Machine Tool Control Transformer

Description

1.Application

BK series machine tool control transformer is suitable for circuit of 50~60Hz, voltage up to 500V, usually applied as power supply for machine tool electrical appliances, local lightings and indicator lamps.

2.Structure character
According to different structures, BK transformer belongs to shell type, and according to the installation mode, it belongs to vertical type.
3.Working environment
1.Ambient air temperature: -5^oC~+40^oC, the highest monthly mean temperature should not exceed +30^oC;
2.Altitude for installing place should not exceed 1000m;
3.When the ambient air temperature is +40, the relative humidity should not exceed 50%, and it allows higher relative humidity under lower temperature. Max average humidity in the dampest month is 90%, meanwhile the lowest average temperature of this month is +25^oC, and condensation on the product surface caused by temperature change should be taken into consideration.
4.Specification

Model	Overall size(mm)			Hole distance for installation(mm)		Installation hole (mm)K x J
Model	Bmax	Dmax	Emax	A	C	Installation hole (mm)K x J
BK-50	76	76	83	61±0.4	54±3	5 × 12
BK-100	84	92	100	70±0.4	60±2.5	6 × 12
BK-150	96	105	110	80±0.4	62±2.5	6 × 12
BK-250	105	120	125	88±0.4	73±3	9 × 11.5
BK-300	115	125	125	95±0.4	76±3	9 × 11.5
BK-400	120	130	130	100±0.4	80±3	9 × 11.5
BK-500	134	144	150	100±0.4	86±3	9 × 11.5
BK-700	150	150	158	125±0.4	100±3	9 × 11.5
BK-1000	150	153	160	125±0.4	110±3.5	9 × 11.5
BK-1500	160	240	137	134±0.4	116±3.5	9 × 11.5
BK-2000	189	270	145	158±0.4	122±3.5	9 × 11.5

Type	Outline(mm)	Mounting size(mm)	Primary voltage	Secondary voltage	Weight(kg)	QTY/CTN
BK-25VA	76×80×75	63×44	220V 380V	380V,220V,110V,36V,24V,12V,6V (TO BE CHOSEN)	1.97	16
BK-50VA	85×90×80	71×61			3.3	16
BK-100VA	103×92×95	87×69			5.5	12
BK-150VA	103×100×95	87×76			6.4	8
BK-200VA	103×106×95	87×81			7.3	8
BK-250VA	115×110×130	95×84			9	6
BK-300VA	115×115×130	95×86			9.87	6
BK-400VA	134×132×150	107×93			13.9	4
BK-500VA	134×137×150	107×98			15.5	4
BK-1000VA	153×149×168	128×115			25	2
BK-1500VA	175×185×185	140×135			17	1
BK-2000VA	175×195×185	140×145			21	1
BK-2500VA	207×250×230	168×163			25	1
BK-3000VA	207×250×230	168×173			28	1
BK-4000VA	240×240×250	200×160			40	1
BK-5000VA	240×250×250	200×170			41	1

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for BK Series Industrial Machine Tool Control Transformer.

📥

Official Technical Datasheet (PDF) Complete electrical ratings, tripping characteristics, dimensions, and compliance specifications.

📐

2D/3D CAD & Dimensional Drawings STEP, DXF, and PDF CAD drawing files for panel builders and switchgear designers.

Technical FAQ & Selection Guide

💡 Frequently Asked Technical Questions & Selection Guide

Pure engineering specifications, tripping curve parameters, and electrical selection guidance for panel builders and system designers.

Voltage & Load Sizing

How to verify rated operational voltage, frequency, and load duty cycle?

Verify that the nominal line voltage (AC 230V single-phase or 400V/415V/690V three-phase at 50/60Hz, or DC voltage ratings) falls within the continuous maximum operating limits of the device. Check duty cycle ratings (continuous vs intermittent duty) to ensure thermal stability under full load.

Protection & Environment

What ingress protection (IP Rating) and environmental enclosures are recommended?

For clean indoor electrical rooms, standard IP20 modular DIN-rail housings are recommended. For outdoor, industrial washdown, or dusty environments, mount components inside weatherproof enclosures rated IP65/IP66 with UV-resistant polycarbonate or powder-coated steel enclosures equipped with compression cable glands.

Selectivity & Grading

How to ensure upstream and downstream coordination in power distribution boards?

Ensure proper discrimination by grading current thresholds and tripping time delays: upstream devices should have higher current ratings and intentional short-time delays (Class S), allowing downstream branch MCBs to clear localized faults without blacking out the entire facility.

Installation & Mounting

What mounting rails, busbars, and spatial clearances are required?

Components mount on standard symmetrical 35mm DIN rail (EN 60715 / TH35-7.5) or backplate screw fixings. Maintain recommended top/bottom ventilation gaps (typically 30–50mm) to ensure unrestricted air convection, and use standard pin/fork comb busbars to minimize contact resistance and wiring errors.

Conductor & Torque Sizing

What conductor sizes and terminal tightening torques should be applied?

Select copper or aluminum conductor cross-sections complying with IEC 60364-5-52 current-carrying capacity tables based on continuous load. Always use a calibrated torque screwdriver or torque wrench to tighten terminal screws to the manufacturer-specified torque to prevent hot-spot degradation and loose connections.