Taco SR501-4 Switching Relay 1 Zone Compact Plug In UL CSA Certified

Description

Product Overview

The Taco SR501-4 Switching Relay is engineered for precise 1‑zone control in modern heating, ventilation, and air‑conditioning (HVAC) applications. Constructed with a rugged polymer housing and a compact plug‑in form factor, the relay fits easily into tight control panels while providing a reliable connection point for thermostat wiring. It operates on a 24 V power source, meeting both UL and CSA safety standards, and includes a built‑in fuse for added protection. The device is factory‑tested at 100 % to guarantee performance, and it carries a three‑year extended warranty, reflecting Taco’s confidence in durability and long‑term service life. Dimensions of 9 × 5.8 × 3 inches and a weight of just one pound make it lightweight yet robust, suitable for both new installations and retrofits.

Usage

Designed for professional HVAC technicians and experienced DIY installers, the SR501-4 excels in residential furnace replacement projects, commercial boiler control, and any system requiring a single‑zone thermostat interface. Its plug‑in mounting type simplifies wiring: connect the thermostat leads to the designated terminals, secure the relay in the control board, and power up the system. The relay’s isolated end switch prevents cross‑talk between circuits, ensuring clean signal transmission even in electrically noisy environments. Because the unit is compatible with universal thermostats, it can be paired with programmable, smart, or legacy devices without additional adapters. The compact design also reduces panel space usage, allowing more components to be housed within the same enclosure, which is especially valuable in space‑constrained commercial installations.

Why Choose Us

Choosing the Taco SR501-4 means selecting a product backed by decades of industry expertise and a commitment to quality. Each relay is manufactured in the USA, adhering to strict quality control processes that include automated testing and manual inspection. The unit’s UL and CSA certifications provide assurance of compliance with North American safety regulations, while the 24 V power handling capability aligns with standard HVAC control voltages, eliminating the need for additional transformers. Taco’s extended three‑year warranty offers peace of mind, covering defects in materials and workmanship, and the company’s dedicated technical support team is available to assist with installation questions, troubleshooting, and warranty claims. This combination of robust construction, regulatory compliance, and after‑sales service distinguishes the SR501-4 from generic, off‑brand alternatives.

Key Features

• Compact plug‑in design saves panel space and speeds up installation.
• UL and CSA certifications guarantee safety and code compliance.
• 24 V power handling matches standard HVAC control voltages for easy integration.
• Built‑in fuse and isolated end switch protect your system from overloads.
• Three‑year extended warranty backed by responsive technical support.

FAQ

Is the SR501-4 compatible with smart thermostats?

Yes, the relay works with universal, programmable, and smart thermostats because it follows standard 24 V wiring conventions and provides isolated switching contacts.

What does the “plug in” mounting type mean?

Plug‑in mounting allows the relay to be inserted directly into a compatible slot on the control board without the need for screws or additional hardware, simplifying the installation process.

Can the relay be used in commercial HVAC systems?

Absolutely. Its robust construction, UL/CSA approvals, and ability to handle 24 V make it suitable for both residential and commercial applications where reliable single‑zone control is required.

What is covered under the three‑year warranty?

The warranty covers any defects in materials or workmanship. If the relay fails under normal operating conditions within three years of purchase, Taco will repair or replace it at no cost.

Do I need any additional components to install the SR501-4?

No additional components are required for standard installations. The relay includes all necessary terminals and a built‑in fuse, so you only need the appropriate thermostat wiring and a compatible control board slot.