Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
TACO SR502-5 2-Zone Switching Relay, 120V AC Primary, 24V AC Secondary, 6 A FLA - Zone-Switching Relays
TACOZone-Switching Relays

TACO SR502-5 2-Zone Switching Relay, 120V AC Primary, 24V AC Secondary, 6 A FLA

The TACO SR502-5 is a 2-zone switching relay designed for HVAC zone control, operating with a 120V AC primary and 24V AC secondary. It supports a full-load amperage (FLA) rating of 6 A at 120V AC. This zone-switching…

SKU 3G-OTH-67191

Also listed as: SR5025 · SR502 5

Brand
TACO
Item
SR502-5 2-Zone Switching Relay, 120V AC Primary, 24V AC Secondary, 6 A FLA
Category
Zone-Switching Relays
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

TACO
Manufacturer Part Number
SR502-5
Number of Zones
2
Current Ratings @ Voltages
FLA: 6 A @ 120V AC

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

TACO Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The TACO SR502-5 is a 2-zone switching relay designed for HVAC zone control, operating with a 120V AC primary and 24V AC secondary. It supports a full-load amperage (FLA) rating of 6 A at 120V AC. This zone-switching relay provides straightforward on/off switching for two zones.

Frequently Asked Questions

What is the TACO SR502-5 zone switching relay used for?

The TACO SR502-5 is used for HVAC zone control, providing on/off switching for two heating or cooling zones. It is commonly installed in residential and light commercial systems to manage zone valves or circulator pumps, ensuring independent temperature control in different areas of a building.

What are the specifications of the TACO SR502-5?

The TACO SR502-5 is a 2-zone switching relay with a 120V AC primary and 24V AC secondary. It has a full-load amperage (FLA) rating of 6 A at 120V AC. The manufacturer part number is SR502-5, and it is designed for straightforward on/off switching for two zones.

Where to buy the TACO SR502-5 worldwide?

You can source the TACO SR502-5 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; we provide reliable sourcing for this zone switching relay.

How to install the TACO SR502-5 zone switching relay?

Install the TACO SR502-5 by mounting it securely and connecting the 120V AC primary power and 24V AC secondary control wiring per the wiring diagram. Ensure all connections match the zone valve or circulator specifications. Follow standard HVAC safety practices, including disconnecting power before installation.

Used in

Common applications for TACO
Hydronic heating systems — TACO 007 series circulator pumps for residential boiler water circulation.
Commercial HVAC — TACO 2400-60-3P inline pump for chilled water loops in large buildings.
Industrial process cooling — TACO 1630EAE10132096 pump for high-flow (110 gpm) cooling applications.
Zone control in radiant floor heating — TACO V075T2G2ZA024Q4A2 zone valve for regulating flow to individual zones.
Pump replacement and maintenance — TACO 007-045RP cartridge assembly for servicing existing 007 series pumps.
Piping connections in hydronic systems — TACO 110-251F-1 flange for joining pumps to pipework.

TACO 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.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Compatible alternatives & equivalents

Cross-referenced by specification & description
24V AC on/off electric actuator for normally closed zone valves. Part of the Zone Sentry series. Used in hydronic heating and cooling systems to regulate water flow through zone valves
TACO
24V AC on/off electric actuator for normally closed zone valves. Part of the Zone Sentry series. Used in hydronic heating and cooling systems to regulate water flow through zone valves
The TACO Zone Sentry actuator is a 24V AC on/off electric zone valve actuator designed for normally open valve action. It is used to control the opening and closing of zone valves in hydronic HVAC systems for residential and commercial heating and cooling zones
TACO
The TACO Zone Sentry actuator is a 24V AC on/off electric zone valve actuator designed for normally open valve action. It is used to control the opening and closing of zone valves in hydronic HVAC systems for residential and commercial heating and cooling zones
This 2-way zone valve features 1/2 in female NPT connections and a 24V AC electric actuator. It is non-spring return and normally open, allowing flow when de-energized. Suitable for controlling hot or chilled water flow in hydronic zoning, fan-coil units, and radiant heating systems
TACO
This 2-way zone valve features 1/2 in female NPT connections and a 24V AC electric actuator. It is non-spring return and normally open, allowing flow when de-energized. Suitable for controlling hot or chilled water flow in hydronic zoning, fan-coil units, and radiant heating systems
This 2-way motorized zone valve is designed for on/off control of hot or chilled water flow in hydronic HVAC systems. It features a 1/2 in female NPT connection, 24V AC actuator, and is normally closed with non-spring return operation
TACO
This 2-way motorized zone valve is designed for on/off control of hot or chilled water flow in hydronic HVAC systems. It features a 1/2 in female NPT connection, 24V AC actuator, and is normally closed with non-spring return operation
2-way, normally open, non-spring return electric zone valve with 1/2 in female NPT connections. Operates on 24V AC actuator voltage. Used in hydronic HVAC systems for on/off control of hot or chilled water flow in zoning, fan-coil units, and radiant heating loops
TACO
2-way, normally open, non-spring return electric zone valve with 1/2 in female NPT connections. Operates on 24V AC actuator voltage. Used in hydronic HVAC systems for on/off control of hot or chilled water flow in zoning, fan-coil units, and radiant heating loops
This 2-way zone valve features a 1 in female NPT connection and operates with a 24V AC actuator. It is normally closed, non-spring return, and controlled by an on/off signal. Used in hydronic HVAC systems to regulate hot or chilled water flow in zoning applications
TACO
This 2-way zone valve features a 1 in female NPT connection and operates with a 24V AC actuator. It is normally closed, non-spring return, and controlled by an on/off signal. Used in hydronic HVAC systems to regulate hot or chilled water flow in zoning applications

More from TACO

View all TACO parts →
6-zone switching relay for HVAC control systems. Operates with 120V AC primary and 24V AC secondary. Locked rotor amperage rating of 36 A at 120V AC. Suitable for multi-zone heating and cooling applications
TACO
6-zone switching relay for HVAC control systems. Operates with 120V AC primary and 24V AC secondary. Locked rotor amperage rating of 36 A at 120V AC. Suitable for multi-zone heating and cooling applications
Single-zone switching relay for HVAC zone control. Operates with 120V AC primary and 24V secondary, rated 12 A FLA at 120V AC. Used to switch zone valves or circulator pumps based on thermostat signals
TACO
Single-zone switching relay for HVAC zone control. Operates with 120V AC primary and 24V secondary, rated 12 A FLA at 120V AC. Used to switch zone valves or circulator pumps based on thermostat signals
Four-zone switching relay with priority zoning for load management. Primary 120V AC, secondary 24V AC switching, rated 20 A @ 120V AC. Used in HVAC zone control for heating or cooling systems
TACO
Four-zone switching relay with priority zoning for load management. Primary 120V AC, secondary 24V AC switching, rated 20 A @ 120V AC. Used in HVAC zone control for heating or cooling systems
TACO
TACO
Zone-switching relay for hydronic heating systems. Provides 3 zones with priority, operating on 120V AC primary supply. Supports full-load amperage of 20 A at 120V AC. Switches circulator pumps or valves based on thermostat calls