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  • 1 Zone Switching Relay Product Image
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    1 Zone Switching Relay SR501-4 1 Zone Switching Relay
    SKU: SR501-4
    Brand: Taco
    (120)
    $60.00 each
    164
    Tue, Apr 14
    1,567
    QtyArrives
    164 Tue, Apr 14
    1,403 Thu, Apr 16 – Fri, Apr 17
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  • 2 Zone Switching Relay Product Image
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    2 Zone Switching Relay SR502-4 2 Zone Switching Relay
    SKU: SR502-4
    Brand: Taco
    (20)
    $142.00 each
    109
    Tue, Apr 14
    1,351
    QtyArrives
    109 Tue, Apr 14
    1,242 Thu, Apr 16 – Fri, Apr 17
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  • 3 Zone Switching Relay Product Image
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    3 Zone Switching Relay SR503-4 3 Zone Switching Relay
    SKU: SR503-4
    Brand: Taco
    (36)
    $150.00 each
    68
    Tue, Apr 14
    1,126
    QtyArrives
    68 Tue, Apr 14
    1,058 Thu, Apr 16 – Fri, Apr 17
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  • 4 Zone Switching Relay Product Image
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    4 Zone Switching Relay SR504-4 4 Zone Switching Relay
    SKU: SR504-4
    Brand: Taco
    (120)
    $182.00 each
    80
    Tue, Apr 14
    833
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    80 Tue, Apr 14
    753 Thu, Apr 16 – Fri, Apr 17
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  • 6 Zone Switching Relay Product Image
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    6 Zone Switching Relay SR506-4 6 Zone Switching Relay
    SKU: SR506-4
    Brand: Taco
    (120)
    $240.00 each
    50
    Tue, Apr 14
    351
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    50 Tue, Apr 14
    301 Thu, Apr 16 – Fri, Apr 17
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  • 2 Zone 120V Switching Relay with DPST switching Product Image
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    2 Zone 120V Switching Relay with DPST switching RA832A1066 2 Zone 120V Switching Relay with DPST switching
    SKU: RA832A1066
    Brand: Honeywell
    (27)
    $75.89 each
    295
    Tue, Apr 14
    295
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    295 Tue, Apr 14
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  • 6 Zone Switching Relay<br>w/ Priority Product Image
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    6 Zone Switching Relay w/ Priority SR506-EXP-4 6 Zone Switching Relay w/ Priority
    SKU: SR506-EXP-4
    Brand: Taco
    (12)
    $248.00 each
    26
    Tue, Apr 14
    121
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    26 Tue, Apr 14
    95 Thu, Apr 16 – Fri, Apr 17
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  • 4 Zone Switching Relay<br>w/ Priority Product Image
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    4 Zone Switching Relay w/ Priority SR504-EXP-4 4 Zone Switching Relay w/ Priority
    SKU: SR504-EXP-4
    Brand: Taco
    (26)
    $190.00 each
    35
    Tue, Apr 14
    117
    QtyArrives
    35 Tue, Apr 14
    82 Thu, Apr 16 – Fri, Apr 17
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  • 3 Zone Switching Relay<br>w/ Priority Product Image
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    3 Zone Switching Relay w/ Priority SR503-EXP-4 3 Zone Switching Relay w/ Priority
    SKU: SR503-EXP-4
    Brand: Taco
    (26)
    $158.00 each
    51
    Tue, Apr 14
    287
    QtyArrives
    51 Tue, Apr 14
    236 Thu, Apr 16 – Fri, Apr 17
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  • 1 Zone 120V Switching Relay w/ Internal Transformer, 1 SPST Product Image
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    1 Zone 120V Switching Relay w/ Internal Transformer, 1 SPST RA89A1074 1 Zone 120V Switching Relay w/ Internal Transformer, 1 SPST
    SKU: RA89A1074
    Brand: Honeywell
    (13)
    $60.99 each
    132
    Tue, Apr 14
    132
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    132 Tue, Apr 14
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  • Switching Relay w/ Internal Transformer DPST Line Voltage Relays Product Image
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    Switching Relay w/ Internal Transformer DPST Line Voltage Relays R845A1030 Switching Relay w/ Internal Transformer DPST Line Voltage Relays
    SKU: R845A1030
    Brand: Honeywell
    (9)
    $77.99 each
    120
    Tue, Apr 14
    120
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    120 Tue, Apr 14
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  • Replacement Fuse - <br>5 Amp (10 Pack) Product Image
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    Replacement Fuse - 5 Amp (10 Pack) SR5A-005RP Replacement Fuse - 5 Amp (10 Pack)
    SKU: SR5A-005RP
    Brand: Taco
    (2)
    $13.99 each
    68
    Tue, Apr 14
    163
    QtyArrives
    68 Tue, Apr 14
    95 Thu, Apr 16 – Fri, Apr 17
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  • Universal Switching Relay w/ Internal Transformer Product Image
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    Universal Switching Relay w/ Internal Transformer R8845U1003 Universal Switching Relay w/ Internal Transformer
    SKU: R8845U1003
    Brand: Honeywell
    (17)
    $58.99 each
    230
    Tue, Apr 14
    230
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    230 Tue, Apr 14
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  • Replacement Fuse - <br>6 Amp (10 Pack) Product Image
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    Replacement Fuse - 6 Amp (10 Pack) SR6A-001RP Replacement Fuse - 6 Amp (10 Pack)
    SKU: SR6A-001RP
    Brand: Taco
    (5)
    $16.99 each
    65
    Tue, Apr 14
    141
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    65 Tue, Apr 14
    76 Thu, Apr 16 – Fri, Apr 17
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  • 2 Zone Pump Controller Switching Relay with Priority Protection Product Image
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    2 Zone Pump Controller Switching Relay with Priority Protection SP-82 2 Zone Pump Controller Switching Relay with Priority Protection
    SKU: SP-82
    Brand: Azel Technologies
    (7)
    $103.95 each
    44
    Tue, Apr 14
    44
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    44 Tue, Apr 14
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  • 6 Zone Expandable Switching Relay Product Image
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    6 Zone Expandable Switching Relay ARM6P 6 Zone Expandable Switching Relay
    SKU: ARM6P
    Brand: Argo
    (25)
    $234.99 each
    166
    Tue, Apr 14
    166
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    166 Tue, Apr 14
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  • 1 Zone Switching Relay Product Image
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    1 Zone Switching Relay AR822II 1 Zone Switching Relay
    SKU: AR822II
    Brand: Argo
    (5)
    $56.99 each
    185
    Tue, Apr 14
    185
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    185 Tue, Apr 14
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  • 4 Zone Expandable Switching Relay Product Image
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    4 Zone Expandable Switching Relay ARM4P 4 Zone Expandable Switching Relay
    SKU: ARM4P
    Brand: Argo
    (25)
    $205.99 each
    169
    Tue, Apr 14
    169
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    169 Tue, Apr 14
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  • Isolation Relay<br>(Up to 3 Zones) Product Image
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    Isolation Relay (Up to 3 Zones) IR882 Isolation Relay (Up to 3 Zones)
    SKU: IR882
    Brand: Argo
    (14)
    $67.99 each
    40
    Tue, Apr 14
    40
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    40 Tue, Apr 14
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  • 3 Zone Pump Controller Switching Relay with Priority Protection Product Image
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    3 Zone Pump Controller Switching Relay with Priority Protection SP-83 3 Zone Pump Controller Switching Relay with Priority Protection
    SKU: SP-83
    Brand: Azel Technologies
    (5)
    $125.95 each
    16
    Tue, Apr 14
    16
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    16 Tue, Apr 14
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  • 1 Zone Pump Controller Switching Relay w/ Surge & Fuse Protection (DPDT) Product Image
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    1 Zone Pump Controller Switching Relay w/ Surge & Fuse Protection (DPDT) SP-81 1 Zone Pump Controller Switching Relay w/ Surge & Fuse Protection (DPDT)
    SKU: SP-81
    Brand: Azel Technologies
    (5)
    $53.75 each
    15
    Tue, Apr 14
    15
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    15 Tue, Apr 14
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  • 3 Zone Expandable Switching Relay Product Image
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    3 Zone Expandable Switching Relay ARM3P 3 Zone Expandable Switching Relay
    SKU: ARM3P
    Brand: Argo
    (25)
    $167.99 each
    176
    Tue, Apr 14
    176
    QtyArrives
    176 Tue, Apr 14
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  • 24v Replacement Relay Product Image
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    24v Replacement Relay SR024-001RP 24v Replacement Relay
    SKU: SR024-001RP
    Brand: Taco
    (6)
    $24.99 each
    48
    Tue, Apr 14
    141
    QtyArrives
    48 Tue, Apr 14
    93 Thu, Apr 16 – Fri, Apr 17
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  • UPZCP-1 Single Zone Pump Control  Product Image
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    UPZCP-1 Single Zone Pump Control 98996400 UPZCP-1 Single Zone Pump Control
    SKU: 98996400
    Brand: Grundfos
    $59.99 each
    11
    Tue, Apr 14
    11
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    11 Tue, Apr 14
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FAQs, Manuals & Videos

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  • Switching relays are used to control the flow of water in a heating system by monitoring temperatures and adjusting boiler water temperature to match the demand. They are used in coordination with circulator pumps and programmable thermostats to control zoning in a hydronic heating system. This makes them ideal for indirect water heaters and priority zoning applications. They maximize efficiency and reduce fuel usage, which saves money. In addition, they provide intermediate switching of a line voltage device from a low voltage controller. Switching relays are available in one to six zone models, and if additional zones are required expandable models provide the ability to expand up to 20 zones.

    We offer a wide selection of Taco, Honeywell , Argo, and Bell & Gossett switching relays for residential and light commercial applications.

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