{"product_id":"18-0-18-stepdown-transformer-3a","title":"18-0-18 Stepdown Transformer 3A","description":"\u003cmeta name=\"description\" content=\"Buy 18-0-18 Stepdown Transformer 3A online in India at best price from The Engineer Store, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n\n\u003ch1\u003e18-0-18 Stepdown Transformer 3A\u003c\/h1\u003e\n\n\u003cp\u003eThe 18-0-18 Stepdown Transformer 3A is a center-tapped power transformer designed to convert 230V AC mains voltage to 18V AC output with a maximum current rating of 3 amperes, making it ideal for low-voltage power supply applications. Professional electronics engineers and hobbyists use this transformer extensively in audio amplifiers, power supply circuits, battery chargers, and laboratory testing equipment where regulated low-voltage AC is required. This transformer solves the critical problem of safely stepping down high mains voltage to safe, manageable levels while providing the center-tap configuration necessary for full-wave rectification in power supply designs.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe 18-0-18 Stepdown Transformer operates on the fundamental electromagnetic induction principle where alternating current flowing through the primary winding induces a proportional voltage in the secondary winding based on the turns ratio. With an 18-0-18V configuration, the transformer provides two 18V windings from a center tap, allowing users to obtain either 18V AC single-ended output or 36V AC peak-to-peak for full-wave rectification circuits. The 3A current rating indicates the maximum RMS current the secondary can safely deliver without exceeding temperature limits, making this model suitable for medium-power applications requiring robust performance and reliability.\u003c\/p\u003e\n\n\u003cp\u003eThis stepdown transformer features a laminated silicon steel core construction that minimizes eddy current losses and reduces heat generation during continuous operation. The primary winding is wound for 230V AC input standard in India, while the secondary windings are precision-wound to deliver accurate 18V output with minimal voltage regulation variation under load. The center-tap configuration is particularly valuable in bridge rectifier and full-wave rectifier circuits, enabling efficient power conversion with reduced ripple voltage compared to half-wave designs. The robust construction with proper insulation between windings ensures electrical safety and extended operational lifespan in demanding industrial and educational environments.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecification\u003c\/td\u003e\n\u003ctd\u003eDetails\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eCenter-Tapped Stepdown Power Transformer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e230V AC, 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Voltage\u003c\/td\u003e\n\u003ctd\u003e18V-0-18V AC (Center-Tapped)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Current Rating\u003c\/td\u003e\n\u003ctd\u003e3A (Maximum RMS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Rating\u003c\/td\u003e\n\u003ctd\u003e108VA (Volt-Amperes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCore Type\u003c\/td\u003e\n\u003ctd\u003eLaminated Silicon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency\u003c\/td\u003e\n\u003ctd\u003e50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTurns Ratio\u003c\/td\u003e\n\u003ctd\u003e12.78:1 (Primary to Secondary)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInsulation Class\u003c\/td\u003e\n\u003ctd\u003eClass B (130 degrees Celsius)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eStandard Quality\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eOriginal\/Authentic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e7 days on manufacturing defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping\u003c\/td\u003e\n\u003ctd\u003e1-5 days from Bengaluru\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDelivery\u003c\/td\u003e\n\u003ctd\u003e7-8 days across India\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport\u003c\/td\u003e\n\u003ctd\u003e24\/7 via Email and WhatsApp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCenter-Tapped Secondary Configuration: Enables full-wave rectification with 36V peak-to-peak output, reducing ripple voltage and improving power supply efficiency compared to half-wave designs\u003c\/li\u003e\n\u003cli\u003e3A Current Capacity: Delivers up to 3 amperes RMS current safely, supporting medium-power applications including audio amplifiers, battery chargers, and laboratory power supplies\u003c\/li\u003e\n\u003cli\u003eLaminated Silicon Steel Core: Minimizes eddy current and hysteresis losses, reducing heat generation and improving transformer efficiency to approximately 85-90 percent\u003c\/li\u003e\n\u003cli\u003ePrecise Voltage Regulation: Maintains stable 18V output across load variations, ensuring consistent performance in sensitive electronic circuits and measurement equipment\u003c\/li\u003e\n\u003cli\u003eClass B Insulation: Rated for continuous operation at elevated temperatures up to 130 degrees Celsius, ensuring reliability in enclosed cabinets and continuous-duty applications\u003c\/li\u003e\n\u003cli\u003eHeavy-Duty Construction: Robust design with proper insulation between primary and secondary windings provides electrical safety and extended operational lifespan\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplications and Use Cases\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAudio Amplifier Power Supplies: The center-tapped configuration is ideal for powering push-pull audio amplifier stages, providing symmetric positive and negative voltage rails from a single transformer\u003c\/li\u003e\n\u003cli\u003eLaboratory Power Supply Units: Electronics technicians and engineers use this transformer as the core component in adjustable DC power supplies, providing stable low-voltage AC for rectification and regulation circuits\u003c\/li\u003e\n\u003cli\u003eBattery Charging Systems: The 3A rating makes this transformer suitable for charging lead-acid batteries, lithium-ion packs, and NiMH batteries with proper rectification and control circuitry\u003c\/li\u003e\n\u003cli\u003eEducational Electronics Projects: Perfect for student projects, hobby circuits, and prototyping applications where safe low-voltage AC power is required for learning transformer principles and power supply design\u003c\/li\u003e\n\u003cli\u003eIndustrial Control Circuits: Used in relay control systems, solenoid drivers, and automation equipment requiring isolated low-voltage AC power for safe operation of control components\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow to Use\u003c\/h2\u003e\n\u003cp\u003eTo use the 18-0-18 Stepdown Transformer 3A, first ensure your mains supply is 230V AC at 50Hz, which is standard throughout India. Connect the primary winding terminals to your mains supply through appropriate overcurrent protection such as a fused switch or circuit breaker rated for at least 500mA. Never operate the transformer without proper fusing as this protects both the transformer and your circuit from fault conditions. Allow adequate ventilation around the transformer during operation as it will generate heat proportional to the load current.\u003c\/p\u003e\n\n\u003cp\u003eFor the secondary side, connect your load across either the full 18V-0-18V terminals for center-tap operation, or between one 18V terminal and the center tap for single-ended 18V output. If you are building a rectifier circuit, use the center-tap configuration with a full-wave rectifier bridge to obtain approximately 25V DC after filtering, which can then be regulated using linear or switching regulators. Always ensure that the secondary current does not exceed 3A RMS, as exceeding this rating will cause excessive heating and potential transformer damage. For applications requiring higher current, connect multiple transformers in parallel with current-sharing resistors or use a higher-rated transformer model.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between 18-0-18V and a standard 18V transformer?\u003c\/summary\u003e\n\u003cp\u003eThe 18-0-18V center-tapped configuration provides two separate 18V windings connected at a common center point, allowing you to obtain either 18V single-ended output or 36V peak-to-peak for full-wave rectification. A standard 18V transformer has only one secondary winding, limiting you to half-wave rectification which produces higher ripple voltage and lower efficiency. The center-tap design is essential for audio amplifiers and quality power supplies requiring low-ripple DC output.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this transformer with 110V or 120V mains supply?\u003c\/summary\u003e\n\u003cp\u003eNo, this transformer is specifically designed for 230V AC input at 50Hz, which is the standard mains voltage in India. Using it with 110V or 120V supplies will result in only half the rated secondary voltage (approximately 9V instead of 18V), making it unsuitable for your application. If you require a transformer for 110-120V input, please contact our team for alternative models designed for that voltage range.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat happens if I exceed the 3A current rating?\u003c\/summary\u003e\n\u003cp\u003eExceeding the 3A RMS current rating will cause excessive heating in the transformer windings due to increased I-squared-R losses. This leads to insulation degradation, potential winding failure, and risk of fire in extreme cases. The transformer may also develop a burning smell and become too hot to touch. Always ensure your load current stays within the 3A limit by using proper current limiting or by selecting a higher-rated transformer for high-current applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this transformer suitable for continuous 24\/7 operation?\u003c\/summary\u003e\n\u003cp\u003eYes, the 18-0-18 Stepdown Transformer 3A is rated for continuous duty operation with proper ventilation. The Class B insulation allows sustained operation at elevated temperatures up to 130 degrees Celsius. However, ensure adequate airflow around the transformer, avoid stacking other components on top of it, and monitor temperature during extended operation. If the transformer becomes excessively hot (too hot to touch), reduce the load current or improve ventilation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen will I receive my order?\u003c\/summary\u003e\n\u003cp\u003eOrders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is your return and warranty policy?\u003c\/summary\u003e\n\u003cp\u003eWe offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre bulk discounts available?\u003c\/summary\u003e\n\u003cp\u003eYes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eWhy Buy from The Engineer Store\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Products: Sourced directly from authorized distributors with authentication\u003c\/li\u003e\n\u003cli\u003eExpert Team: Our technical team validates every product before listing\u003c\/li\u003e\n\u003cli\u003eFast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse\u003c\/li\u003e\n\u003cli\u003ePan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata\u003c\/li\u003e\n\u003cli\u003ePayment Options: COD, UPI, credit\/debit cards, net banking, EMI available\u003c\/li\u003e\n\u003cli\u003eTechnical Support: 24\/7 expert guidance via email and WhatsApp\u003c\/li\u003e\n\u003cli\u003eReturns: 7-day return policy on manufacturing defects only\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBuy 18-0-18 Stepdown Transformer 3A Online in India\u003c\/h2\u003e\n\u003cp\u003ePurchase the \u003cstrong\u003e18-0-18 Stepdown Transformer 3A\u003c\/strong\u003e online at \u003ca href=\"https:\/\/theengineerstore.in\"\u003eThe Engineer Store\u003c\/a\u003e, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on \u003cstrong\u003e18-0-18 Stepdown Transformer 3A\u003c\/strong\u003e with fast shipping and expert support.\u003c\/p\u003e\n\u003cp\u003eOur team in Bengaluru is available 24\/7 to support your journey from product selection to project completion.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":43854069924003,"sku":"TES-EV0882713","price":1195.68,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/4479\/7091\/products\/IMG_2633-314x252.jpg?v=1704200585","url":"https:\/\/www.theengineerstore.in\/ta\/products\/18-0-18-stepdown-transformer-3a","provider":"The Engineer Store","version":"1.0","type":"link"}