BK Transformer

About the BK Transformer

The BK Transformer is part of the ELEHPD Power Transformer range. BK Control Transformer（25VA-5000VA） Model External size Installation hole distance Installation hole KxJ B(max) D(max) E(max) A C BK-50 86 95 93 70±0.4 50±3 5×12 BK-100 100 110 113 80±0.4 60±2.5 6×12 BK-150 100 125 113 85±0.4 66±2.5 6×12 BK-250 160 107 137 100±0.4 80±3 9×11.5 BK-300 160 107 137 1000±0.4 80±3 9×11.5 BK-400 160 143 137 110±0.4 92±3 9×11.5 BK-500 160 143 137 110±0.4 92±3 9×11.5 BK-70 ELEHPD manufactures and exports low voltage electrical products from Yueqing, Zhejiang, China, supplying distributors, panel builders, M&E contractors and OEM buyers worldwide.

Typical applications

Industrial control panels and PLC power rails
LED drivers, signage and display power
Battery charging and DC backup systems
Motor drives, welding sets and rectifier assemblies
Instrumentation and test equipment

How to specify the right Power Transformer

Size the output current with at least 20-30 % headroom over the load
Check the input range covers the local supply, including brown-outs
Confirm the enclosure and cooling method for the panel temperature
Verify the protection set: over-current, over-voltage, thermal and short circuit

Specifications

BK Control Transformer（25VA-5000VA）

Model	External size	Installation hole distance	Installation hole KxJ
B(max)	D(max)	E(max)	A	C
BK-50	86	95	93	70±0.4	50±3	5×12
BK-100	100	110	113	80±0.4	60±2.5	6×12
BK-150	100	125	113	85±0.4	66±2.5	6×12
BK-250	160	107	137	100±0.4	80±3	9×11.5
BK-300	160	107	137	1000±0.4	80±3	9×11.5
BK-400	160	143	137	110±0.4	92±3	9×11.5
BK-500	160	143	137	110±0.4	92±3	9×11.5
BK-700	160	160	137	110±0.4	102±3	9×11.5
BK-1000	160	180	137	150±0.4	100±3.5	9×11.5
BK-1500	160	240	137	160±0.4	132±3.5	9×11.5
BK-2000	184	240	145	160±0.4	132±3.5	9×11.5

JBK Control Transformer（40VA-3000VA）

Model	External size	Installation hole distance	Installation hole KxJ	F(max)
B(max)	D(max)	E(max)	A	C
JBK3-40、63	78	72	89	50±0.4	51±2	4.8×9	12
JBK3-100	85	85	94	84±0.4	60±2	4.8×9	12
JBK3-100	90	91	100	84±0.4	66±2	5.8×11	14
JBK3-250	95	105	100	84±0.4	78±2	5.8×11	14
JBK3-400	120	109	123	90±0.4	87±2	7×12	15
JBK3-610	150	112	150	122±0.4	90±2	7×12	22
JBK3-1000	150	195	151	120±2	90±2	7×12	10
JBK3-1600	164	220	163	140±2	170±2	7×12	10
JBK3-2500	200	250	171	172±2	200±2	7×12	10

Frequently asked questions about the BK Transformer

How much headroom should I leave on the power rating?

For continuous industrial duty plan on 20-30 % headroom above the measured load. For loads with high inrush, such as motors or capacitive input, allow more and check the surge rating rather than only the average current.

Do these units accept 110 V and 230 V mains?

Input ranges are model-specific and shown in the specification table. Where a wide-range input is available it is stated; otherwise send your mains voltage and we will match the model.

What protection features are built in?

Typical protection covers short circuit, over-current, over-voltage and thermal shutdown. The exact set is listed per model in the specification table above.

Can you supply matching DIN-rail or enclosed versions?

Open-frame, enclosed and DIN-rail variants exist across this family. Send the model you are working from and we will confirm the equivalent mounting option.