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Single Phase Transformers
21 Series · 232 Models
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Single Phase Transformers Overview
Single-phase control transformers provide galvanic isolation and a dedicated control voltage for machine tools, automation equipment, lighting systems, and control circuits. QDTB units span 25 VA to 50 kVA with input voltages up to 1000 V at 50/60 Hz, manufactured to ISO 9001 standards with high-grade steel cores that reduce no-load losses and noise. Product lines include DK, BK, JBK3, JBK5, JBK6, EI, OD, R-type, DTZ, UDG, SLB, JMB, DM, and JY, covering factory, workshop, CNC, and medical equipment applications.
Available Series
DK Series
The DK series single-phase control transformers provide stable voltage output for industrial control circuits, signal lighting, and auxiliary power supply applications. Compact design with high reliability.
BK Series
The BK series single-phase control transformers are widely used for machine tool control circuits and signal lighting power supply. Available in 25VA to 5000VA ratings.
JBK3 Series
The JBK3 series machine tool transformers are designed for CNC machines and automated equipment, providing isolated and stable power for control circuits.
JBK5 Series
The JBK5 series is an upgraded machine tool transformer with enhanced insulation and thermal performance, suitable for high-precision industrial automation.
JBK6 Series
The JBK6 series represents the latest generation machine tool transformers with superior performance, compact size, and enhanced safety features.
EI Series
EI laminated-core control transformers power low-voltage control and lighting circuits. 15-100 VA, 220 V primary to 24 V secondary, compact for panel mounting.
OD Series
OD isolation transformers provide 1:1 galvanic isolation to protect equipment and personnel. 25-1000 VA, 220 V to 220 V, low leakage current for sensitive loads.
Microwave Series
Microwave oven transformers step up 220 V AC to 2100 V to drive the magnetron. 500-3000 W output for household and commercial microwave ovens.
R-type Series
R-type transformers use a round R-core for low leakage flux, low noise and low loss. 10-2000 VA, 220 V primary, ideal for precision instruments and audio equipment.
DTZ Series
DTZ high-capacity isolation transformers provide 630-1600 VA of galvanic isolation for industrial equipment, suppressing noise and transients.
UDG Series
UDG 1:1 isolation transformers isolate sensitive equipment from mains noise. 1-10 kVA, 220 V to 220 V, for machinery and control systems.
UN Series
UN transformers deliver 25-200 kVA with fully custom secondary voltages for heavy industrial and utility applications.
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Certification
The values below are computed from what you selected above. Anything that cannot be computed yet is shown as an em dash — never as zero.
Iₙ = S / (√3·U) · I_sc = 100·Iₙ / uₖ · S_sc = √3·U·I_sc · I_p = k·Iₖ
Still required to complete the calculation: rated capacity S, impedance voltage uₖ, short-time or peak withstand current.
Per-model values (P0 / Pk / uₖ declared by the factory, losses, noise, temperature rise, dimensions, weight) are not in the product library: those rows stay at an em dash until the factory parameter sheet is supplied. An em dash means the value is unavailable — it is never rendered as zero.
Read-only: no price factor, not part of the sum — the loss-grade cost is already carried by the efficiency (subtype) base price, so charging here would double-bill. Values come from the product library type-test data, interpolated between published capacities; grades the library does not cover show an em dash, never zero.
Reference prices are for estimation only and do not constitute a formal offer.
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Application Scenarios
Machine Tools & CNC
Safe isolated control power for CNC machines, lathes and milling machines, protecting sensitive electronics from mains noise.
Industrial Automation
Dedicated control voltage for PLCs, sensors, relays and actuators in automated production lines.
Control Circuits
Galvanic isolation between power and control circuits, powering contactors, relays and indicator lamps.
Lighting Systems
Low-voltage supplies for safe lighting, machine work lamps and signal lighting installations.
Medical Equipment
Isolated, low-leakage power for diagnostic and treatment equipment where patient safety is critical.
HVAC & Building Automation
Control transformers for building management, HVAC actuators and access control systems.
Technical Advantages
Safe Galvanic Isolation
Primary-to-secondary isolation protects control circuits and personnel from mains faults.
Low No-Load Loss
High-grade silicon steel cores reduce standing losses and audible noise.
Compact Footprint
EI, R-type and toroidal cores offer high power density for space-constrained panels.
Custom Voltages
Multiple taps and custom secondary voltages up to 1000V input for any equipment spec.
FAQ - Single Phase Transformers
What is the difference between a control transformer and a distribution transformer?
How do I select the right capacity?
Can they run at 60 Hz?
What is the minimum order quantity (MOQ) for Single Phase Transformers?
What is the delivery time for Single Phase Transformers?
Which standards and certifications do your Single Phase Transformers comply with?
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All specifications and dimensions can be customized upon request
Control vs Single-Phase Distribution vs Isolation: How to Choose
| Control Transformer (BK/JBK) | Single-Phase Distribution (Pole/Pad) | Isolation Transformer (DK) | |
|---|---|---|---|
| Purpose | Holds a control voltage steady for coils, relays and lamps | Steps the feeder down for a residential or rural load | Breaks the galvanic path for equipment or medical loads |
| Rating | VA to a few kVA, panel mounted | Up to tens of kVA at distribution voltage | VA to tens of kVA, floor or panel mounted |
| Winding | Multi-tap primary to trim the control voltage | Distribution windings with low no-load loss | Same-voltage or step-down ratio, with an electrostatic shield |
| Mounting | DIN rail or panel inside a control cabinet | Pole, pad or platform outdoors | Cabinet, floor or wall |
| Loads | Contactors, PLC supplies and indication | Lighting, small motors and households | Sensitive instruments, medical and test gear |
| Losses | Small absolute loss on a low no-load loss core | No-load loss matters because the unit runs around the clock | Modest, on a shielded core |
| Typical application | Machine tools, CNC and automation panels | Rural feeders and residential networks | Laboratories, medical rooms and marine panels |
Where QDTB® Single-Phase Transformers Are Specified
The panel-mount ratings are specified inside machine tools, CNC cabinets and automation panels, where the control circuit needs its own steady voltage and its own isolation from the machine supply. A multi-tap primary lets the commissioning engineer trim the secondary to the voltage the coils and PLC supply actually want.
Lighting systems and HVAC or building-automation panels use the same transformer family for local control and isolation. The 50/60 Hz rating means one part number serves equipment built for either grid frequency, which matters for imported panels.
Pole-mounted and pad-mounted single-phase units serve rural feeders and residential networks where a three-phase supply is not justified by the load. On those circuits no-load loss runs continuously, which is why the low-loss core and the loss grade are specified rather than left to the supplier.
Units are designed and tested to IEEE C57.12.00, GB1094 and JB/T10318. Every QDTB® unit leaves the factory with routine test data, which is what the panel builder files for the installation inspection.
Frequently Asked Questions
What is the difference between a control transformer and a distribution transformer?
A control transformer is small (VA to tens of kVA) and powers control circuits with tight regulation. A distribution transformer is large (kVA to MVA) and feeds whole buildings or grids.
How do I select the right capacity?
Sum the inrush VA of all coils and lamps the transformer will feed, then add a 20-30% margin. Under-sizing causes voltage sag on energisation.
Can they run at 60 Hz?
Yes. All QDTB control transformers are rated 50/60 Hz; confirm the required taps and voltage when ordering.
What is the minimum order quantity (MOQ) for Single Phase Transformers?
One unit for standard products. Custom-designed equipment is quoted on specifications — send your parameters or drawings and our sales team will confirm the MOQ for your configuration.
What is the delivery time for Single Phase Transformers?
Standard units are delivered in 30-45 days. Custom or large-capacity units follow a project-specific schedule confirmed at quotation. Rush orders can be accommodated for urgent projects.
Which standards and certifications do your Single Phase Transformers comply with?
They are designed and tested to IEEE C57.12.00, GB1094, JB/T10318. All QDTB® equipment is ISO 9001 certified and CE marked, and the company operates ISO 9001, ISO 14001 and ISO 45001 management systems.