Taco switching relays combine clearly labeled PC board layouts with advanced features that allow for total system customization. Whether using basic priority switching or the advanced features of the -ExP controls, the job is made easy. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups. All switching relays are UL listed, are compatible with conventional and programmable thermostats.

• External indicator lights
• Plug-In power port cards
• Switchable priority
• Simplified wiring
• Fully enclosed snap-out relays
• Compact design
• Fuse protected
• 100% factory tested
• Isolated end switch
• Contractor friendly PC board layout
• Universal thermostat compatibility
• All circulator relay connections, including ZC/ZR, are rated 1/3 HP (6 amp full load, 36 amp locked rotor) at 120 VAC
• End switch connections are rated 24 VAC, 1 amp
• All thermostat connections supply a 24 VAC class 2 output

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Taco SR506-EXP-4

Taco SR501-4 1-Zone Switching Relay, 120 VAC at 60 Hz, 12 amp

• External indicator lights
• Universal replacement
• Snap-in PC board
• Simplified wiring
• Fuse protected outputs
• 100% factory tested
• Contractor friendly PC board layout
• Universal thermostat compatibility
• All circulator relay connections rated 1/3 HP (6 amp full load, 36 amp locked rotor) at 120 VAC
• Thermostat connection supplies a 24 VAC class 2 output

Sid Harvey Item #:SR501: Replaces Part #:'s : 5C955,
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Taco SR501

Taco SR504-4 switching relay is the best choice for all your zoning needs, with advanced powerport cards, External diagnostic lights, switchable priority and contractor friendly PC board layouts. Combined with the time proven reliability of the 00 family of circulators and thermostats, total system integrating is achieved. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups.

• External indicator lights
• Switchable priority
• Priority protection
• Simplified wiring
• Sealed relays
• Fuse protected outputs
• Compact design
• 100% factory tested
• Isolated end switch
• Contractor friendly PC board layout
• Universal thermostat compatibility
• All circulator relay connections, including ZC/ZR, are rated 1/3 HP (6 amp full load, 36 amp locked rotor) at 120 VAC
• End switch connections are rated 24 VAC, 1 amp
• All thermostat connections supply a 24 VAC class 2 output

Sid Harvey Item #:SR504: Replaces Part #:'s : SIDSSR504,
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Taco SR504

Taco SR503-4 switching relay is the best choice for all your zoning needs, with advanced powerport cards, External diagnostic lights, switchable priority and contractor friendly PC board layouts. Combined with the time proven reliability of the 00 family of circulators and thermostats, total system integrating is achieved. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups.

• External indicator lights
• Switchable priority
• Priority protection
• Simplified wiring
• Sealed relays
• Fuse protected outputs
• Compact design
• 100% factory tested
• Isolated end switch
• Contractor friendly PC board layout
• Universal thermostat compatibility
• All circulator relay connections, including ZC/ZR, are rated 1/3 HP (6 amp full load, 36 amp locked rotor) at 120 VAC
• End switch connections are rated 24 VAC, 1 amp
• All thermostat connections supply a 24 VAC class 2 output

Sid Harvey Item #:SR503: Replaces Part #:'s : ERSR301,
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Taco SR503

Taco SR506-4 switching relay is the best choice for all your zoning needs, with advanced powerport cards, External diagnostic lights, switchable priority and contractor friendly PC board layouts. Combined with the time proven reliability of the 00 family of circulators and thermostats, total system integrating is achieved. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups.

• External indicator lights
• Switchable priority
• Priority protection
• Simplified wiring
• Sealed relays
• Fuse protected outputs
• Compact design
• 100% factory tested
• Isolated end switch
• Contractor friendly PC board layout
• Universal thermostat compatibility
• All circulator relay connections, including ZC/ZR, are rated 1/3 HP (6 amp full load, 36 amp locked rotor) at 120 VAC
• End switch connections are rated 24 VAC, 1 amp
• All thermostat connections supply a 24 VAC class 2 output

Sid Harvey Item #:SR506: Replaces Part #:'s : ERSR601,
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Taco SR506

Taco SR120-001RP Line voltage Plug-In Cube Replacement Switching Relay, 120 volt

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Taco SR120-001RP

Taco SR504-ExP-1 Formed Sheet Metal 4-Zone Switching Relay with Priority, 24 volt Power Input or Output Terminal, 120 VAC Transformer Input, DPDT

• External indicator lights
• Switchable priority
• Simplified wiring
• Fully enclosed snap-out relays
• Compact design
• Fuse protected
• 100% factory tested
• Isolated end switch
• Contractor friendly PC board layout
• Universal thermostat compatibility
• Plug-in power port card slots
• Add-on power control plug
• Interface with ExP zone valve controls
• Extended 3 years warranty
• (3) power port slots, (1) power control plugs

Sid Harvey Item #:SR504ExP: Replaces Part #:'s : 6C632,
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Taco SR504EXP

Taco SR024-001RP Replacement Switching Relay, 24 volt

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  Taco SR024-001RP

Warren Technology T9C Relay

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Warren Technology T9C

Caleffi Expandable Switching Relay W/Priority 3- Zone

Caleffi ZSR103

Taco zone valve controls work with two, three or four wire zone valves. Fully fuse protected, they also include two isolated end switches and a built-in priority switch. The contractor friendly PC board layout eliminates the problems caused by incorrect wiring and the"unfinished" look of conventional zone valve installations.

• External indicator lights
• Switchable priority
• Simplified wiring
• Compact design
• Fuse protected
• Two isolated end switches
• Extra set of dry contacts
• Contractor friendly
• PC board layout
• Universal thermostat compatibility
• 2 Power port slots

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Taco ZVC403

Taco zone valve controls work with two, three or four wire zone valves. Fully fuse protected, they also include two isolated end switches and a built-in priority switch. The contractor friendly PC board layout eliminates the problems caused by incorrect wiring and the"unfinished" look of conventional zone valve installations.

• External indicator lights
• Switchable priority
• Simplified wiring Compact design
• Fuse protected
• Two isolated end switches
• Extra set of dry contacts
• Contractor friendly
• PC board layout
• Universal thermostat compatibility
• 2 Power port slots

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Taco ZVC405