Control Transformers
Control Transformers supply an identified control circuit at the required secondary voltage and duty.
Product-type reference. The supplied make and configuration are confirmed in your quotation.
Control transformer supply for panels and machinery
Tirupati Power Enterprises supplies control transformer requirements for industrial control panels, machine circuits and maintenance spares. Send the existing transformer reference or identify the primary supply, secondary voltage, continuous burden and pickup demand. A control transformer enquiry should describe what the secondary circuit must supply, rather than only a VA number.
This page covers the transformer component. An electronic DC power supply, current transformer and complete control panel have different functions and buying requirements. Procurement teams in Kolkata, West Bengal, Odisha and Assam can send a control-load schedule and the required delivery location for a configuration-based quotation.
Information to include in your RFQ
Selection requirements for this product type |
|---|
Primary supply and secondary voltages |
Continuous VA and inrush burden |
Isolation, frequency and temperature requirement |
Mounting, protection and terminal arrangement |
Replacement and quotation checks
For a replacement, send the existing control transformers reference and photographs of its markings, connections and mounting. Include the equipment drawing or datasheet where available. Identify which functions must remain unchanged and whether an alternative make is acceptable.
Related products and buying guidance
Browse switchgear requirements
Miniature Circuit Breakers (MCB)
Moulded Case Circuit Breakers (MCCB)
Request a line-by-line quotation
Sources and further reading
Schneider Electric low-voltage products
Control transformer specification schedule
Contactor and relay coils can have different pickup and holding burdens. Match the transformer to the operating sequence and the required secondary-voltage performance.
Buying detail | Include in your RFQ | Confirmation to request |
|---|---|---|
Input supply | Primary voltage, frequency, phases and required taps | Confirm the input arrangement and connection diagram |
Output | Secondary voltage(s), current/burden and number of windings | Identify separate outputs and required isolation arrangement |
Continuous demand | Sealed/holding VA of loads energised together | Confirm the continuous thermal rating for the actual load schedule |
Pickup/inrush | Simultaneous coil pickup and permitted voltage dip | Check the manufacturer’s inrush selection data rather than adding only holding VA |
Installation | Mounting centres, dimensions, enclosure space and ambient | Verify physical fit, clearances and environmental limits |
Accessories and documents | Terminal covers, fuse/protection scope and required test data | Quote the complete component and accessory requirement |
Compare quotations for the same supply scope
Control transformer prices depend on voltage arrangement, VA rating, construction, mounting and accessory scope. Two units with the same continuous VA may not have the same inrush or regulation performance. Compare the proposed reference and output arrangement, including terminal covers, protective accessories and documentation. Separate a transformer-only price from a complete wired panel or assembly offer.
Prepare your requirement for a quotation
For a spare, send the nameplate and photographs of the terminals and mounting. Include the machine reference, wiring diagram and whether the original dimensions must be retained.
For a new panel, provide the holding and pickup burdens and indicate which loads energise together. Have the designer state the allowable secondary-voltage behaviour and protection requirements before the final purchase selection.
- Primary supply, secondary voltages and required taps/windings.
- Continuous burden and simultaneous pickup/inrush schedule.
- Mounting dimensions, ambient and enclosure constraints.
- Accessories, required documentation, quantity and delivery details.
Checks before you approve the order
Include both load conditions
Eaton’s control-power-transformer selection guidance distinguishes sealed VA from pickup/inrush requirements and checks secondary voltage during pickup.
Do not substitute by voltage alone
A matching voltage ratio does not establish continuous burden, inrush capability, isolation or physical fit.
Define the supplied scope
List terminal covers, protection accessories and mounting parts when required. A bare transformer price does not include the complete control circuit.
Buying guidance and technical reference
Related buying ranges and detailed guidance
Contactors & Overload (O/L) Relays
HRC Fuses, Fuse Links & Fuse Holders (DIN/Bolt type)
Contactor Selection Guide: Load Duty, Coil Voltage and Coordination
PLC Control Panel Specification Checklist: I/O, Sequences and Handover
Manufacturer technical reference
Eaton: control power transformer sealed and inrush VA selection
Questions about Control Transformers
What should I check before selecting control transformers?
Continuous VA alone may not cover contactor pickup demand. Specify simultaneous inrush and the required voltage regulation.
What information is needed to quote control transformers?
Provide primary supply and secondary voltages; continuous VA and inrush burden; isolation, frequency and temperature requirement; mounting, protection and terminal arrangement. Include the quantity, requested make or existing reference and delivery PIN code.
What information is needed for a control transformer quotation?
Provide primary voltage/frequency, secondary arrangement, continuous VA, pickup burden, mounting and environmental requirements. Send the old reference for an exact replacement.
Is continuous VA enough to select a control transformer?
Not always. Coil pickup demand and allowable secondary-voltage dip can affect selection. Use the load sequence and manufacturer’s inrush data.
Can a control transformer replace a 24V DC SMPS?
They perform different conversion functions. Confirm the circuit’s AC/DC output and regulation requirements rather than substituting on a voltage label.
Can I request more than one secondary output?
State every required output, voltage, burden and winding/isolation arrangement. The proposed construction and availability must be confirmed in the quotation.
What helps identify a replacement transformer?
Send the nameplate, wiring/terminal diagram, mounting centres, overall dimensions and connected-load information, with the machine or panel reference.
Relevant products and guidance
A PLC control panel specification should define the process sequence, operating modes, tagged I/O, field interfaces, communications and acceptance tests.
Read articleBuying GuidesContactor Selection: Load Duty, Coil and ProtectionContactor selection depends on the load, utilisation category, operating voltage and current, switching duty and coil supply.
Read articleNeed this for your application?
Send the specification, quantity and delivery PIN code. Our Kolkata team quotes supply across India, including eastern India, with availability and freight confirmed for your order.