Allanson Transformers 421-BT387

Allanson Transformers 421-BT387 is a 120 Volt Primary 10k Secondary Replacement Ignition Transformer designed for dependable ignition in heating and appliance systems, including boilers, furnaces, water heaters, and other burner assemblies. Built as a direct retrofit option, this transformer delivers a robust spark that starts reliably under varying loads and conditions, helping to keep equipment running smoothly.

This replacement ignition transformer features a compact, rugged enclosure that resists heat, vibration, and harsh service environments. Its 120V primary with a 10k secondary configuration ensures high-quality ignition performance while remaining compatible with standard control boards and safety interlocks used in residential and commercial installations.

Designed for easy installation, the Allanson 421-BT387 uses familiar mounting patterns and lead connections, enabling quick swaps without rewiring. Expect long life and low maintenance thanks to durable components and quality insulation. Ideal for technicians seeking a reliable, readily available ignition transformer for HVAC and burner systems.

• 120V primary / 10k secondary for powerful, reliable ignition across burner applications
• Replacement ignition transformer designed for easy retrofit into existing systems
• Compact, rugged enclosure built to withstand heat, vibration, and demanding environments
• Compatible with standard burner controllers, safety interlocks, and control boards
• Simple installation with standard mounting holes and lead connections