EI114 Low Frequency Control Transformer 230V 50/60Hz For Industrial Machine Tool

The EI114 control transformer is a single phase, low frequency isolation transformer built on an EI114 laminated silicon steel core, designed to supply the control circuits of industrial machinery. It steps a 230V AC mains input down to safe low voltage control levels and provides galvanic isolation between the mains side and the control side, which protects operators, contactors, relays, PLCs and indicator circuits from line disturbances.

The unit shown is built with a 230V 50/60Hz primary (RED-RED) and two independent secondary groups: 12.0V x 2 rated at 1.0A (YELL-BLK-YELL) and 24.0V x 2 rated at 8.0A (BLU-BLK-BLU). Each secondary group has a centre tap, so it can be wired for the nominal voltage, for a doubled voltage in series, or for a higher current in parallel. This flexible winding arrangement lets one transformer feed several control rails at once instead of using two separate units.

Construction is open frame with a bolt-on mounting bracket and colour-coded flying leads, which makes installation inside a control cabinet straightforward. The core is stacked from cold-rolled silicon steel laminations, the windings use full copper enamelled wire, and the whole assembly is varnish impregnated to lower audible hum and resist humidity. The design is manufactured under UL file E332338 and produced in our own factory under an ISO 9001 quality system.

• Galvanic isolation between the mains and the control circuit protects operators and sensitive control electronics from line surges and earth faults.
• Dual independent secondary groups let one transformer supply two different control rails, saving cabinet space and simplifying the wiring layout.
• Centre-tapped windings give three connection options per group: nominal voltage, series for double voltage, or parallel for higher current.
• Robust EI laminated core with a large iron cross-section handles the inrush current of contactors and solenoids without saturating.
• Full copper windings keep the temperature rise within 60 K at full load and give stable output voltage under sustained duty.
• Varnish impregnation locks the laminations and windings together, which reduces the mechanical hum typical of low frequency transformers.
• Open frame construction with a bolt-on bracket allows fast DIN panel or base plate mounting inside a control cabinet.
• Colour-coded flying leads shorten installation time and reduce wiring mistakes during panel assembly.
• Built under UL file E332338, which shortens the safety review when your equipment is exported to North America.
• Continuous duty design rated for 100% load, suitable for machines that run in long shifts.
• 100% electrical testing on every unit: turns ratio, no-load current, hi-pot and insulation resistance.

• Machine tool control circuits: CNC machines, lathes, milling machines, presses and cutting equipment.
• Industrial control cabinets: PLC supplies, relay and contactor coils, indicator lamps, push button and signal circuits.
• Automation lines: conveyors, packaging machines, robotic cells, sorting and labelling equipment.
• Elevator, escalator and hoist control systems.
• HVAC and building services: air handling units, pumps, chillers and boiler control panels.
• Welding equipment, textile machinery, printing machinery and woodworking machines.
• Test benches, laboratory equipment and instrumentation power supplies.
• Safety and isolation applications where a low voltage supply must be separated from the mains.
• Retrofit and maintenance replacement for existing control transformers in installed machinery.

• Established in 2000, with 26 years focused on magnetic components for industrial control and power electronics; we are a manufacturer, not a trading company.
• Self-owned 10,000 square metre factory with 8 complete production lines, which keeps lead times and quality consistent on repeat orders.
• A 20-person R&D team supports you from drawing review and sample building through to mass production, and a 20-person QC team controls the process.
• Complete certification framework: ISO 9001 and ISO 14001 system certification, with CE, CB, UL, cUL and RoHS product certification available. This model is produced under UL file E332338.
• Annual export value of USD 42 million, shipping to North America (50%), Northern Europe (18%), South America (15%) and Southeast Asia (15%), including OEM customers such as Midea and Federal Signal.
• Flexible cooperation: MOQ from 1,000 pcs, DDP and DDU terms supported, direct factory delivery.

• Built to your drawing rather than sold as a fixed part: primary voltage, secondary voltages, VA rating and tap positions all follow your control schematic.
• One unit replaces two: the dual secondary design covers a low current 12V rail and a high current 24V rail in a single transformer.
• Generous core and copper sizing gives thermal headroom, so the transformer keeps its output voltage stable when several contactors pull in at once.
• Produced under an existing UL file, which reduces the certification burden on your finished machine.
• Consistent stacking and winding process keeps the turns ratio and no-load current repeatable from batch to batch.
• Free engineering support before the design is frozen: send us your control voltage requirements, total VA and mounting space, and we will recommend the right core size and winding arrangement.