Single Phase Dry Type Control Isolation Transformer Manufacturer

JBK 25va-5000va Single Phase Dry Type Machine Control Isolation Transformer 220v to 110v

The JBK series is a compact dry-type control transformer designed for machine control and isolation in industrial panels. Typical use is 220 V → 110 V control circuits for contactors, relays, PLCs and sensors. Built for low noise, high reliability and easy cabinet mounting, JBK protects control circuits from mains disturbances while simplifying wiring and maintenance.

Key benefits (what you get)

Stable control voltage: low-distortion, repeatable output that keeps relays and PLCs behaving predictably.
True galvanic isolation: separate primary and secondary windings block common-mode noise and improve safety.
Dry-type & safe for cabinets: no oil — lower fire risk and minimal maintenance (open-frame IP00 models; enclosed versions available).
High build quality: cold-rolled silicon-steel core, precision winding, optional vacuum impregnation (VPI) for mechanical strength.
Factory testing & documentation: hi-pot, turns-ratio (TTR), insulation resistance and temperature-rise reports available per order.
Flexible options: multiple taps, alternate output voltages (6–220 V), custom input voltages and enclosures on request.

Typical applications

CNC & machine tool control cabinets
Contactor and relay coil supplies in industrial panels
PLC and control logic power for automation lines
Test benches, laboratory equipment and OEM control systems
Local lighting control inside machinery

Model Meaning

Model	JBK3 □
JBK	Machine control transformer
3	Design serial number
□	Rated capacity
□	Tropical Product Code Humid Tropics Dry Tropics

Technical Parameter

Model	JBK5-25VA~10KVA
Phase	Single phase
Input voltage	220V/380V (customizable voltage)
Output voltage	6V/12V/24V/36V/110V/220V (customizable voltage)
Frequency	50Hz/60Hz
Efficiency	≥98%
IP Rating	IP00
Power	25VA	50VA	100VA	200KVA	250VA	300VA
Size(mm) BDE	150160130	150160130	150160130	160170135	130210155	130210155
Mounting Dimensions A*C	64*47	70*57	84*68	84*84	95*80	95*90
Power	500VA	1000VA	2000VA	3000VA	4000VA	5000VA
Size(mm) BDE	210230175	218290185	260330235	280350230	360355288	360355288
Mounting Dimensions A*C	110*110	125*128	143*140	170*160	190*155	200*140
The size and weight vary depending on the voltage range, and are subject to the customized actual product.

Dimensional-drawing-of-low-voltage-dry-type-machine-tool-control-transformer

Installation & wiring (quick practical notes)

Mount with adequate ventilation and clearance inside the control cabinet.
Connect primary to 220 V L/N per nameplate; secondary supplies 110 V control loads.
Bond transformer frame to protective earth. If grounding the secondary neutral is required, consult engineering — grounding may change isolation behavior.
Protect primary with appropriate fuses or breakers sized to carry inrush and rated current; consider inrush mitigation for large contactor banks.
Commissioning checks: polarity/phase, insulation resistance (megger), and turns-ratio test (TTR).

How to choose the right JBK model

Sum up all control circuit loads in VA (coils, PLCs, sensors).
Add a 20–30% safety margin for inrush and future expansion.
Match input/output voltages and confirm mounting space and enclosure needs.
Request factory test reports and confirm any regulatory or IP requirements.

If you’d like, send your load list and panel dimensions — our engineers will size the exact JBK model and provide wiring diagrams.

FAQs

Q1 — Can the JBK be used in CNC machine control panels?
A: Yes. JBK is designed for machine control — stable output for contactor coils, PLCs and sensors. For heavy inrush (many contactors), pick a higher VA rating or consider inrush-limiting measures.

Q2 — Is the secondary isolated from the mains?
A: Yes. JBK is a true isolation transformer with separate primary and secondary windings, providing galvanic separation to reduce common-mode noise and improve safety. If you need a grounded secondary neutral, consult our engineers for the correct earthing approach.

Q3 — Can you provide custom voltages or enclosed housings?
A: Absolutely. We offer custom input/output voltages, multi-tap options, enclosed housings, IP ratings and OEM labeling. Tell us your specs and we’ll supply datasheets, drawings and lead-time.

Need a datasheet, wiring diagram or model recommendation for your control panel? Send your system voltages, full control-circuit load (VA), and mounting constraints — our technical sales team will return a sizing proposal, CAD drawing and factory test data.