SR501-4 Switching Relay Replacement YILISAWIN Direct Fit for Taco HVAC

Description

Product Overview

The YILISAWIN SR501-4 Switching Relay Replacement is engineered as a precise, drop‑in solution for the Taco SR501‑4, SR501, 501‑4, and 501 series relays. Its compact dimensions of 7.09 x 6.3 x 2.37 inches and lightweight design (1.08 lbs) make it easy to handle during installation. Constructed from high‑temperature resistant polymer and fully enclosed snap‑out relays, the unit delivers consistent electrical performance while protecting internal components from dust and moisture.

Designed for 24 V AC thermostat systems, this relay supports single‑zone heating and cooling applications across residential and light commercial environments. The integrated LED indicator lights provide immediate visual feedback on power status and zone activation, simplifying troubleshooting and reducing downtime. Each unit undergoes rigorous full‑load testing to verify reliability under continuous operation.

Compatibility is a core strength: the relay matches the pin layout and wiring scheme of original Taco models, allowing a seamless replacement without rewiring or additional adapters. This eliminates the risk of installation errors and ensures that the system returns to optimal performance quickly.

With a price point of $66.99, the YILISAWIN relay offers a cost‑effective alternative to OEM parts while maintaining the same functional standards. Its durability, ease of installation, and clear diagnostics make it a preferred choice for HVAC technicians and DIY enthusiasts alike.

Usage

Ideal for hydronic heating systems, boilers, and air‑conditioning units, this relay controls a single zone, making it perfect for homes with zone‑based temperature management. Install it in furnace control panels, boiler rooms, or any HVAC enclosure where a 24 V AC thermostat is present.

During seasonal changes, the relay reliably switches the heating or cooling circuit on demand, responding to thermostat signals with minimal latency. Its heat‑resistant housing ensures stable operation even when placed near high‑temperature components such as burners or heat exchangers.

Technicians often use this relay in retrofit projects, upgrading older systems to improve reliability without replacing the entire control board. The LED status indicators help verify correct wiring and operation during commissioning, reducing the time spent on field diagnostics.

Why Choose Us

YILISAWIN commits to quality through strict manufacturing standards and comprehensive testing. Every relay is subjected to a full‑load endurance test that simulates real‑world operating conditions, guaranteeing performance over the lifespan of the HVAC system.

Our focus on material selection means the relay’s enclosure resists heat, corrosion, and mechanical stress, extending service life and reducing the need for frequent replacements. The snap‑out relay design also facilitates easy maintenance, allowing technicians to replace individual contacts without discarding the entire unit.

Customer support is a cornerstone of our service. Our responsive team is available to answer technical questions, provide installation guidance, and address any concerns post‑purchase, ensuring a smooth experience from order to long‑term operation.

Key Features

• Direct drop‑in fit for Taco SR501‑4, SR501, 501‑4, and 501 models eliminates rewiring.
• Heat‑resistant housing protects the relay in high‑temperature environments.
• Bright LED indicators give instant visual status of power and zone activation.
• Reliable single‑zone control works with any standard 24 V AC thermostat.
• Responsive customer support and comprehensive warranty for peace of mind.

FAQ

Is this relay compatible with all Taco SR501 series models?

Yes, the YILISAWIN SR501-4 Switching Relay is engineered to match the pin configuration and electrical characteristics of every Taco SR501‑4, SR501, 501‑4, and 501 model, providing a true drop‑in replacement.

Can I install this relay myself, or do I need a professional?

The relay is designed for straightforward installation. If you have basic electrical knowledge and access to the existing thermostat wiring, you can replace the original relay yourself. However, for safety and compliance with local codes, many users prefer to have a licensed HVAC technician perform the installation.

What does the LED indicator tell me?

The LED lights show two key states: a steady light indicates that the relay is receiving power from the thermostat, while a flashing light confirms that the zone is actively engaged. This visual feedback helps quickly verify correct operation and diagnose issues.

How does the relay handle high‑temperature conditions?

The enclosure is made from a high‑temperature polymer that can withstand the heat generated by nearby burners or heat exchangers. This material choice prevents deformation and maintains reliable contact performance even in demanding environments.

What warranty and support are provided?

Each relay comes with a one‑year limited warranty covering defects in materials and workmanship. Our support team is available via email or phone to assist with installation questions, troubleshooting, and any warranty claims.