Potted Compact EI76 Low Frequency Transformer High Isolation Stable
Controls
The following values are common international buyer inquiry
references. They are not fixed or guaranteed ratings for every
potted EI76 transformer. Final electrical, insulation, thermal,
mechanical, certification, and test requirements are confirmed
through the approved specification, drawing, certification record,
and sample-validation process.
| Industry | Typical Application | Typical Input Requirement | Typical Output Requirement | Typical Capacity Inquiry | Frequency | Key Parameters Evaluated | Safety and Environmental Focus | Available Customization |
|---|
| Industrial automation | Encapsulated control power for PLC panels sensors and relays | 110 V 115 V 120 V 220 V 230 V or 240 V AC | 6 V 9 V 12 V 15 V 18 V 24 V 36 V or 48 V AC | Approximately 20 VA to 200 VA | 50 Hz 60 Hz or dual frequency | Regulation no-load current losses temperature rise dielectric
strength and leads | Industrial insulation humidity vibration and cabinet temperature | Taps dual primaries outputs reinforced insulation thermal fuse
leads connectors and potting |
| Control cabinets | Supply for contactors interfaces and cabinet auxiliaries | 110 V 120 V 220 V 230 V 240 V or 380 V AC | 12 V 24 V 48 V 110 V or customized AC | Approximately 20 VA to 250 VA | 50 Hz or 60 Hz | Regulation inrush no-load loss dielectric strength noise and
thermal margin | Creepage clearance pollution degree and cabinet temperature | Multi-tap input center tap thermal protector shield harness and
mounting |
| Emergency power and UPS | Potted auxiliary supply for controls relays and monitoring | Utility inverter or generator-derived AC input | Isolated control monitoring fan relay or charger-support voltage | Approximately 20 VA to 250 VA | 50 Hz or 60 Hz | Standby loss inrush regulation dielectric strength and temperature
rise | Continuous standby surge thermal endurance and humidity | Low-inrush design shield outputs thermal protection leads and
traceability |
| Energy storage systems | Control transformer for PCS cabinets cooling and contactors | Grid inverter or specified auxiliary AC supply | 12 V 24 V 48 V 110 V or customized control voltage | Approximately 20 VA to 250 VA | 50 Hz or 60 Hz | Isolation regulation losses temperature rise and mechanical fit | High-voltage cabinet humidity vibration and thermal cycling | Reinforced insulation shield protection connectors mounting and
potting |
| HVAC and building controls | Transformer for thermostats valves relays and actuators | 120 V 208 V 220 V 230 V or 240 V AC | 12 V 24 V or 48 V AC | Approximately 20 VA to 150 VA | 50 Hz or 60 Hz | Regulation no-load current temperature rise noise and overload
profile | Humidity condensation vibration and enclosure temperature | Dual primary 24 V output thermal fuse harness connector and
moisture-resistant potting |
| EV charging equipment | Encapsulated auxiliary transformer for charger controls | Customer-defined charger auxiliary input | Isolated control contactor cooling or service output | Approximately 20 VA to 200 VA | 50 Hz or 60 Hz | Isolation dielectric strength regulation inrush temperature rise
and lead routing | Charger surge humidity vibration and insulation coordination | Reinforced insulation shield protection connectors mounting and
documented tests |
| Medical and laboratory equipment | Isolation supply for diagnostic and laboratory subsystems | Regional mains with specified tolerance | One or more isolated AC outputs | Approximately 20 VA to 150 VA | 50 Hz 60 Hz or dual frequency | Capacitance dielectric strength regulation no-load current magnetic
field and temperature rise | Coordination with applicable end-equipment requirements | Reinforced insulation shield low-capacitance winding protection and
documented tests |
| Security and access control | Supply for alarms locks and access panels | 110 V 120 V 220 V 230 V or 240 V AC | 12 V 16 V 18 V 24 V or 30 V AC | Approximately 20 VA to 150 VA | 50 Hz or 60 Hz | Regulation standby loss temperature rise lock current and connector
reliability | Continuous duty humidity enclosure temperature and protection
coordination | Fused primary protection multiple outputs harness mounting and
labeling |
| Industrial instrumentation | Isolation supply for measurement and sensor systems | Customer-specified regional mains input | Isolated AC for rectification regulation or direct circuits | Approximately 10 VA to 150 VA | 50 Hz 60 Hz or dual frequency | Ratio accuracy regulation losses dielectric strength capacitance
and noise | Measurement-system insulation humidity and documentation | One-to-one isolation shield reinforced insulation connectors and
custom tests |
Major customizable parameters include input and output voltage,
rated VA, frequency, voltage taps, regulation, no-load current,
no-load loss, copper loss, efficiency, temperature rise, insulation
class, dielectric strength, creepage and clearance, thermal
protection, electrostatic shielding, leads, connectors, housing
dimensions, mounting, potting compound, flammability, moisture
resistance, labeling, certification scope, and production tests.
Product Description
This EI76 variant is a fully potted low-frequency isolation
transformer intended for industrial control power, auxiliary
voltage conversion, galvanic isolation, building controls,
emergency-power equipment, energy-storage cabinets, and other 50 Hz
or 60 Hz applications requiring an enclosed construction.
The image shows a compact black potted housing with an elevated
upper section, an external label, and two flexible insulated leads
with different terminations. Primary and secondary lead
assignments, connector functions, dimensions, internal lamination
stack, voltage, current, and capacity must be confirmed by the
approved drawing.
The marketing image describes the product as UL Certified Fully
Potted and High Isolation. The visible label appears to carry a UL
Recognized Component marking. However, the certification file
number, exact model coverage, ratings, insulation system, and
conditions of acceptability cannot be verified from the image
alone.
Buyers should confirm the applicable UL certification record and
ensure that the ordered model and construction are included within
its scope. A customized configuration is not automatically covered
by an existing certification.
EI76 does not define a universal voltage, current, VA rating,
dielectric strength, insulation class, or thermal rating. Final
performance depends on:
- Lamination stack and core grade
- Flux density
- Frequency
- Winding configuration
- Conductor size
- Voltage regulation
- Insulation system
- Potting compound and thermal path
- Ambient temperature
- Mounting and duty cycle
- Permitted temperature rise
Product Construction
| Construction Item | Potted EI76 Customization Reference |
|---|
| Magnetic platform | EI76 silicon-steel laminated core enclosed within the potted
assembly |
| Housing | Compact black housing with material dimensions flammability and
mounting confirmed by drawing |
| Potting compound | Fully potted construction with resin chemistry thermal conductivity
hardness expansion and temperature range confirmed by specification |
| Primary winding | Single dual tapped or multiple-voltage primary |
| Secondary winding | Single dual multiple or center-tapped output |
| Winding conductor | Enameled copper wire selected according to current regulation and
temperature rise |
| Insulation system | Bobbin tape barriers sleeving margins lead insulation and potting |
| Lead wires | Two external lead assemblies are visible but their electrical
assignments require confirmation |
| Connectors | Connector family terminals keying locking and mating requirements
can be customized |
| Electrostatic shield | Optional primary-to-secondary shield with grounding lead |
| Thermal protection | Optional thermal fuse thermostat or temperature sensor |
| Mechanical reinforcement | Potting lead anchoring coil fixing and connector strain relief |
| Traceability | Custom model voltage wiring certification marking date code and lot
code |
Final body dimensions, mounting interface, lead exits, lead
lengths, connectors, clearances, weight, and tolerances must be
confirmed by the approved drawing.
Product Characteristics
Fully Potted Construction
Full potting can support moisture resistance, mechanical
protection, winding fixation, lead retention, and consistent
external dimensions. Resin selection and temperature-rise
validation remain essential.
High Isolation Design Options
Insulation barriers, creepage and clearance, sleeving, winding
separation, dielectric testing, lead routing, and potting can be
developed around the required working voltage. High isolation must
be expressed as a defined and tested specification.
Low Frequency Voltage Conversion
The EI76 platform can be developed for step-down, step-up, or
one-to-one AC isolation at 50 Hz or 60 Hz. It must not be connected
directly to DC.
Stable Voltage Regulation
Turns count, conductor size, lamination stack, and winding
arrangement can be developed around specified no-load and full-load
voltage limits.
Low Noise Oriented Construction
Potting can help restrain internal components. Lamination fit, flux
density, input waveform, mounting, and enclosure resonance also
influence audible noise.
Environmental and Mechanical Protection
The enclosed potted structure may provide improved resistance to
humidity, dust, vibration, and handling compared with an open-frame
transformer. Actual environmental capability must be validated.
Custom Leads and Connectors
Wire gauge, insulation, color, length, stripping, terminals,
connector family, keying, locking, sleeves, and strain relief can
be adapted to the customer assembly.
Applications
- Industrial control cabinets
- PLC and automation panels
- Emergency-power and UPS auxiliary circuits
- Energy-storage PCS cabinets
- EV charging equipment controls
- HVAC controllers relays and actuators
- Security and access-control systems
- Building-automation equipment
- Industrial instrumentation
- Medical and laboratory equipment where appropriately evaluated
- Isolated linear power supplies
- Moisture-exposed or vibration-sensitive equipment
- Step-up step-down and one-to-one AC isolation
Suitability must be confirmed according to the actual electrical,
thermal, mechanical, environmental, certification, and safety
conditions.
Quality Control
Incoming Material Inspection
Inspection may cover silicon-steel laminations, bobbins, copper
wire, insulation tape, barriers, sleeving, leads, connectors,
thermal protectors, housing materials, potting compounds, labels,
and supplier documentation.
Design Review
Engineering review can evaluate voltage, VA, frequency, flux
density, turns count, conductor size, no-load current, losses,
regulation, efficiency, inrush, insulation, creepage, clearance,
dielectric strength, potting thermal path, temperature rise, leads,
connectors, and certification scope.
In Process Control
Controls may include turns counting, winding direction, insulation
placement, lead identification, shield installation, thermal-device
placement, soldering, core fixing, housing preparation, resin
mixing, vacuum treatment, filling, curing, lead sealing, and
labeling.
Electrical Testing
Tests may include:
- Winding resistance
- Turns ratio and polarity
- No-load voltage
- Full-load voltage
- No-load current
- No-load loss
- Voltage regulation
- Dielectric strength
- Insulation resistance
- Continuity
- Thermal-device function
- Application-specific functional testing
Test voltage, duration, frequency, input conditions, load
conditions, limits, sampling level, and testing frequency must
follow the approved test plan.
Mechanical Inspection
Inspection may cover housing dimensions, lead exits, lead length,
wire gauge, connectors, terminals, strain relief, potting fill,
surface appearance, labels, weight, mounting, and workmanship.
Sample Validation
Samples should be tested at minimum and maximum input voltage,
applicable frequency, no load, full load, expected overload,
ambient-temperature range, normal mounting, humidity, vibration,
enclosure conditions, and intended connector loading.
Validation may include regulation, efficiency, temperature rise,
inrush, audible noise, dielectric performance, moisture resistance,
lead pull, and thermal-protector operation.
Traceability
Lamination lots, conductor lots, insulation batches, connectors,
potting batches, winding records, test results,
certification-controlled materials, and engineering changes can be
controlled.
Company Profile
Chipsen specializes in the development and manufacturing of custom
magnetic components for industrial equipment power electronics
automation systems and electrical control applications.
The product range includes high-frequency transformers,
low-frequency transformers, planar transformers, power inductors,
high-current inductors, toroidal inductors, common-mode chokes, EMI
filter magnetics, wireless charging coils, custom coils, and
non-standard magnetic components.
Chipsen supports drawing-based development, sample-based
replacement development, and application-requirement design.
Engineering discussions can cover low DCR, leakage inductance, EMI,
insulation, temperature rise, winding structure, footprint, pinout,
terminals, protection devices, and production-testing requirements.
The objective is to provide evaluation-ready samples and a clearly
defined specification before production approval.
Why Choose Chipsen
Application Specific Customization
The potted EI76 can be developed around voltage, VA, frequency,
regulation, dielectric strength, temperature rise, insulation,
potting, housing, leads, connectors, mounting, environment, and
certification requirements.
OEM and ODM Support
The image states that OEM and ODM customization is available.
Customized configurations must be reviewed separately for
electrical performance and certification coverage.
Drawing and Sample Based Development
Chipsen can review an existing drawing or sample. Operating
conditions, certification requirements, and acceptance limits
should also be provided.
Engineering Collaboration
Engineering discussions can address rated VA, no-load current,
regulation, losses, dielectric strength, insulation, capacitance,
temperature rise, potting, housing, leads, connectors, mounting,
and testing.
Flexible Prototype Support
The image states an MOQ starting from 1 piece. Final availability
and pricing remain subject to materials, tooling, design
complexity, certification-controlled materials, and quotation
confirmation.
Responsive Project Handling
The image states a quotation target within 3 days and sample
production within 7 days. These targets apply after complete
information is received and the specification, certification scope,
tooling, and materials are confirmed.
Warranty Support
The image states a 5-year warranty and a 20-year warranty for
special industries. Final coverage and eligibility require
application review, validation, operating limits, and written
agreement.
Controlled Specification Process
The approved drawing, electrical specification, insulation system,
certification-controlled construction, materials, validation
results, and test plan form the basis for production control.
Mechanical Integration Support
Housing dimensions, mounting, leads, connectors, lead exits, strain
relief, potting, markings, and labels can be reviewed for the
customer assembly.
FAQ
Is this EI76 version fully potted?
The image describes the product as fully potted and shows an
enclosed housing. Potting material, fill method, thermal
properties, and environmental performance must be confirmed by the
approved specification.
Is this product UL certified?
The image states UL Certified and the visible label appears to
carry a UL Recognized Component marking. Buyers should request the
applicable UL file or certification record and confirm that the
exact ordered model, ratings, materials, construction, and
conditions of acceptability are covered.
Does EI76 define a fixed VA rating?
No. Rated VA depends on lamination stack, core material, flux
density, frequency, winding design, regulation, potting thermal
path, cooling, insulation, ambient temperature, and temperature
rise.
What information is required for quotation?
Provide input voltage, output voltage and current, VA, frequency,
duty cycle, regulation, no-load limits, dielectric requirements,
insulation class, temperature rise, dimensions, leads, connectors,
mounting, certification requirements, demand, and tests.
Can the input and output voltages be customized?
Yes. Single-primary, dual-primary, tapped, multiple-output,
center-tapped, and regional-voltage configurations may be
developed.
Can it operate at both 50 Hz and 60 Hz?
A dual-frequency design may be developed, but it must be designed
and validated for the lower frequency.
Can it operate from DC input?
No. A conventional low-frequency laminated transformer requires AC
input.
Is the secondary output AC or DC?
The secondary output is AC. Rectification and filtering are
required when the equipment needs DC.
Can high isolation be customized?
Yes. The required dielectric voltage, test duration, creepage,
clearance, insulation category, and certification scope must be
specified.
Can regulation and no-load loss be controlled?
They can be optimized through turns count, conductor size,
lamination grade, stack size, flux density, and winding
arrangement.
Can an electrostatic shield be added?
Yes. Its grounding lead and insulation relationship must be
defined.
Can a thermal fuse or thermostat be installed?
Yes. Device type, temperature rating, position, connection, and
certification requirements must be agreed.
Can leads and connectors be customized?
Yes. Wire gauge, insulation, color, length, terminals, connector
family, keying, locking, and strain relief can be customized.
Can Chipsen develop a replacement from a sample?
Yes. Operating conditions, certification requirements, and critical
limits should also be provided.
What tests are available?
Tests may include winding resistance, turns ratio, polarity,
no-load and full-load voltage, no-load current, losses, regulation,
dielectric strength, insulation resistance, temperature rise,
dimensions, connectors, and application validation.
What is the MOQ?
The image states an MOQ starting from 1 piece. Final availability
and price depend on materials, tooling, certification requirements,
and quotation confirmation.
What is the quotation and sample time?
The image states quotation within 3 days and sample production
within 7 days after complete requirements are received.
What warranty is available?
The image states a 5-year warranty and a 20-year warranty for
special industries. Final coverage is subject to application
review, validation, operating limits, and written agreement.
The EI76 model or potted construction does not by itself define a
fixed power, voltage, current, frequency, dielectric strength,
certification, insulation, environmental, or thermal rating. Final
performance and certification coverage are confirmed only through
the approved drawing, electrical specification, insulation and
material systems, applicable certification record, test plan, and
customer sample-validation process.
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