BK Control Transformer 100VA 300VA 500VA for Machine Control
Construction drawing: EI laminated core, double-section copper winding on a glass-filled bobbin, numbered screw terminals and a zinc-plated panel-mount bracket. The exact outline drawing and terminal…
- Factory-direct pricing, no middleman markup
- Custom voltage, capacity and branding (OEM)
- MOQ from 1 pc (10 pcs for custom voltage), stock units ship in 3–5 days, production 15–25 days
- 12-month warranty with reliable support
Construction drawing: EI laminated core, double-section copper winding on a glass-filled bobbin, numbered screw terminals and a zinc-plated panel-mount bracket. The exact outline drawing and terminal layout for your rating are sent with the quotation.
The BK-100/300/500 series is our machine control transformer line, wound and 100% tested in our own factory in Yueqing, China. These are the workhorse BK control transformers that panel builders, machine builders, and maintenance teams use to step 220V or 380V mains down to the control voltages that relays, contactors, solenoids, and PLCs run on.
Key Specifications
| Specification | Value |
|---|---|
| Models | BK-100 / BK-300 / BK-500 (100VA / 300VA / 500VA) |
| Input Voltage | 220V / 380V AC (selectable) |
| Output Voltage | 24V / 36V / 48V / 110V AC (custom on request) |
| Frequency | 50Hz / 60Hz |
| Winding Type | Copper, varnish-dipped |
| Mounting | Panel mount, standard fixing centres |
| Protection | Thermal cut-out |
| Warranty | 12 months, replacement-first |
What You Get
- Genuine BK control transformer with copper windings
- Input and output terminals clearly marked, wiring diagram printed on the unit
- Panel-mount fixing, standard centres for drop-in replacement
- Batch test certificate with every order
- 12-month replacement-first warranty
Why Choose This Model
The BK series is the standard choice for machine control circuits because it is simple, robust, and easy to replace. When a contactor or a solenoid pulls current, the coil inrush is several times the holding current, and the BK handles it because it is a real transformer with margin, not a cheap power supply. We build the BK range for the loads that actually appear in control panels: PLC power supplies, relay and contactor coils, solenoid valves, indicator lamps, and small motors. If your panel uses BK transformers today, ours are a direct replacement with the same fixing centres and terminal layout.
Typical Applications
- CNC machines and machine tools
- PLC and relay control panels
- Conveyor and packaging lines
- HVAC control circuits
- Lighting and small motor control
BK control transformers, wound and 100% tested in Yueqing, China. MOQ 1 pc for stock units, 10 pcs for custom voltage, lead time 15-25 days, FOB Ningbo or Shanghai.
More from This Range
JBK Machine Control TransformerTerminal-board type for machine tools
TC-1000 Control TransformerHigher capacity control power
TC-D500 Step Up & Step DownDual-direction 500VA control power
ZBK Rectifier Control TransformerAC and DC control power in one unit
JMB Lighting Control TransformerFixed lighting and control power
FAQ
What is a BK control transformer?
A BK control transformer steps mains voltage down to the control voltage used by relays, contactors, solenoids and PLCs in machine control panels.
What sizes are available?
We supply BK-100, BK-300 and BK-500 (100VA, 300VA, 500VA), and larger custom ratings on request.
What input and output voltages?
Input is 220V or 380V AC, output is 24V, 36V, 48V or 110V AC. Custom windings are available.
Can it replace my existing BK transformer?
Yes. The fixing centres and terminal layout match the standard BK range, so it is a drop-in replacement.