Control Transformer
A Control Transformer is a type of isolation transformer specifically designed to supply low-voltage power to control circuits, relays, contactors, solenoids, indication lamps, and other auxiliary equipment in industrial and commercial systems.
Unlike main power transformers, control transformers are optimized for high inrush current handling during the initial energization of electromagnetic devices (e.g., motor starter coils), ensuring stable and reliable operation even under momentary overload conditions.
Product Details
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Features
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Specification
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Type
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Isolation Transformer (Control Duty)
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Input Voltage
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295V – 465V / 340V – 480V (other ranges available)
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Function
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Step-down voltage for control & auxiliary circuits
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Capacity (kVA)
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0.1 kVA to 10 kVA (typical); up to 50 kVA on request
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Input Voltage
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415V, 690V, or as per customer requirement (±1%)
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Output Voltage
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24V, 48V, 110V, 230V AC (customizable)
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Frequency
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50 Hz / 60 Hz ±3%
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Core
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CRGO, Rectangular Core
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Winding Material
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Copper (standard) or Aluminum
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Cooling
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Air-cooled (natural convection)
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Voltage Regulation
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<5% (under inrush conditions)
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Efficiency
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>98%
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Dielectric Strength
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2.5 kV, 60 sec
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Key Features
- Electrical Isolation: Full galvanic isolation between primary and secondary windings.
- Compact & Robust: CRGO core with copper/aluminum windings in a rigid enclosure.
- Multiple Output Voltages: Custom secondary voltages (e.g., 24V, 110V, 230V AC).
- Class ‘F’/‘H’ Insulation: Ensures thermal stability under continuous or intermittent duty.
- Safety Compliance: Meets IS:2026 and international safety standards.
- Front Terminal Block: Easy wiring and maintenance access.
Quality & Testing
- ISO 9001:2015 Certified manufacturing
- Dielectric Strength: 2.5 kV for 60 seconds
- Insulation Resistance: >1000 MΩ
- Leakage Current: <5 mA
- Efficiency: >98%
Applications
- Motor Control Centers (MCCs) – Powering contactor coils and overload relays
- Industrial Automation Systems – PLCs, sensors, and HMI panels
- HVAC Control Circuits – Thermostats, dampers, and valve actuators
- Machine Tools – CNC machines, presses, and conveyors
- Elevators & Lifts – Safety and control relays
Three Phase Air-Cooled Servo Voltage Stabilizer
Beta Power Controls in India?
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Frequently Asked Questions
Standard transformers may sag or trip under the high inrush current of relay/coil loads. Control transformers are specially designed to withstand inrush without output collapse.
Yes—they are true isolation transformers with separate primary and secondary windings.
Typical secondary voltages include 24V, 48V, 110V, 230V AC, as per customer requirement.
Yes—custom kVA rating, input/output voltages, IP rating (IP21–IP54), and mounting options are available.
Standard models are indoor-rated (IP21), but outdoor enclosures (IP54) can be provided on request.
Standard units include 3-pole MCCB on input and 4-pole MCP on output for short-circuit and overload protection.