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12-0-12 Center Tapped Transformer - 3A Step Down

Specification	Details
Input Voltage	220V - 240V AC
Output Voltage	12V - 0 - 12V AC
Output Current	3.0 Amperes (3A)
Type	Center-Tapped Step-Down
Core Material	High-Grade Silicon Steel
Winding	Heavy-Duty Copper / Copper-Clad

Price

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₹ 271.19

(Tax included)

Barcode: 3998304

Product Description

The 12-0-12 3A Center-Tapped Transformer is a high-power electromagnetic solution designed for robust AC-to-AC voltage reduction. With a substantial 3-Ampere current rating, this transformer is built for applications that demand significant power, such as multi-channel audio amplifiers, high-torque DC motor power supplies, and battery chargers for lead-acid cells. The center-tapped secondary winding allows for the creation of symmetrical dual-rail DC power supplies (+15V, 0, -15V after rectification), which are essential for high-fidelity op-amp circuits and professional audio equipment.

Key Features

High Current Delivery: Provides a powerful 3A output, making it capable of driving heavy inductive and resistive loads without excessive voltage sag.
Dual-Rail Versatility: Features a 12V-0-12V configuration, allowing for flexible wiring as a 12V full-wave or a 24V bridge-rectified supply.
Industrial Build Quality: Constructed with a thick, laminated silicon steel core to maximize flux density and minimize magnetic humming during operation.
Heavy-Duty Mounting: Equipped with a reinforced metal frame and wide mounting tabs for secure installation in heavy-duty enclosures.
Thermal Resilience: Precision-wound coils are designed to handle high current loads with stable thermal performance over long periods of use.

Technical Details

Secondary Configuration: 3-wire center-tapped output.
Insulation Class: High-grade polyester film for safety between primary and secondary stages.
Phase: Single-Phase AC operation.

Prototyping and Engineering Tips from Robogears

Rectification Choice: For a standard 12V DC supply, using the center-tap (0) as ground and two diodes on the 12V legs is highly efficient. However, if you need the full 24V potential, ignore the center tap and use a 4-diode bridge rectifier across the two outer 12V wires.
Safety & Fusing: At 3A, a short circuit on the secondary side can generate intense heat and fire hazards. Always install a 3A or 4A fuse on the secondary DC output and a 1A fuse on the primary 220V AC input for comprehensive protection.
Smoothing Capacitors: To maintain a clean DC signal under a 3A load, you will need large electrolytic capacitors. A rule of thumb is 2200uF to 4700uF per Ampere of current to keep voltage ripple within acceptable limits for logic circuits.
Voltage Overhead: Note that the "12V AC" output will peak at approximately 17V DC after rectification. If you are using linear regulators like the 7812, ensure they are mounted on large heatsinks, as they will need to dissipate the 5V difference as heat at 3A.

Package Includes

1 x 12-0-12 12V 3A Center-Tapped Step-Down Transformer

Disclaimer: This device handles lethal 220V AC mains and high-current secondary outputs. Installation must be performed by individuals with proper electrical training. Ensure all high-voltage connections are fully insulated with heat-shrink tubing and that the transformer is mounted in a well-ventilated metal or fire-retardant enclosure.

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