TACO Zone Switching Relay: Switching, 3 with Priority Zones, 0 Power Port Slots
The TACO SR503-5 is a zone-switching relay with 3 zones with priority, operating on a 120V AC primary supply. It supports a full-load amperage (FLA) of 20 A at 120V AC. This switching relay is designed for zone…
SKU 3G-OTH-67263
Also listed as: SR5035 · SR503 5
Local availability & support
- Delivery
- Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
- Payment
- Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.
Need installation or engineering help?
Ask a question
Product Description
The TACO SR503-5 is a zone-switching relay with 3 zones with priority, operating on a 120V AC primary supply. It supports a full-load amperage (FLA) of 20 A at 120V AC. This switching relay is designed for zone control in hydronic heating systems.
Frequently Asked Questions
What is the TACO SR503-5 zone switching relay used for?
The TACO SR503-5 is used for zone control in hydronic heating systems. It switches circulator pumps or valves based on thermostat calls, with 3 zones including a priority zone to ensure the primary zone gets heat first.
What are the specifications of the TACO SR503-5?
The TACO SR503-5 is a 3-zone switching relay with priority, operating on 120V AC primary supply. It has a full-load amperage (FLA) of 20 A at 120V AC. The manufacturer part number is SR503-5.
Where to buy the TACO SR503-5 worldwide?
You can source the TACO SR503-5 through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time.
How to install the TACO SR503-5 zone switching relay?
Install the TACO SR503-5 by mounting it on a wall or panel, connecting the 120V AC primary supply, and wiring each zone's thermostat and circulator. Follow the wiring diagram provided by TACO. Ensure power is off before installation and consult a licensed electrician.
Used in
Common applications for TACOTACO Products
3G Electric supplies TACO zone-switching relays. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
