Trade Professional? Apply to become a TradeMaster!

Switching Relays

  • 1 Zone Switching Relay Product Image
    Add to List
    Add to List
    1 Zone Switching Relay SR501-4 1 Zone Switching Relay
    SKU: SR501-4
    Brand: Taco
    (115)
    $52.99 each
    $209.96 box of 4
    $52.49 each
    354
    Mon, Oct 28
    1,479
    QtyArrives
    354 Mon, Oct 28
    1,125 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • 1 Zone Switching Relay, High Current Capacity Product Image
    Add to List
    Add to List
    1 Zone Switching Relay, High Current Capacity SR501-HC-4 1 Zone Switching Relay, High Current Capacity
    SKU: SR501-HC-4
    Brand: Taco
    (115)
    $85.79 each
    $243.87 box of 3
    $81.29 each
    12
    Mon, Oct 28
    28
    QtyArrives
    12 Mon, Oct 28
    16 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • 2 Zone Switching Relay Product Image
    Add to List
    Add to List
    2 Zone Switching Relay SR502-4 2 Zone Switching Relay
    SKU: SR502-4
    Brand: Taco
    (18)
    $115.59 each
    $335.97 box of 3
    $111.99 each
    240
    Mon, Oct 28
    1,395
    QtyArrives
    240 Mon, Oct 28
    1,155 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • 3 Zone Switching Relay Product Image
    Add to List
    Add to List
    3 Zone Switching Relay SR503-4 3 Zone Switching Relay
    SKU: SR503-4
    Brand: Taco
    (32)
    $127.49 each
    $371.07 box of 3
    $123.69 each
    153
    Mon, Oct 28
    1,007
    QtyArrives
    153 Mon, Oct 28
    854 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • 4 Zone Switching Relay Product Image
    Add to List
    Add to List
    4 Zone Switching Relay SR504-4 4 Zone Switching Relay
    SKU: SR504-4
    Brand: Taco
    (115)
    $153.59 each
    $297.98 box of 2
    $148.99 each
    159
    Mon, Oct 28
    801
    QtyArrives
    159 Mon, Oct 28
    642 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • 6 Zone Switching Relay Product Image
    Add to List
    Add to List
    6 Zone Switching Relay SR506-4 6 Zone Switching Relay
    SKU: SR506-4
    Brand: Taco
    (115)
    $193.79 each
    $383.78 box of 2
    $191.89 each
    72
    Mon, Oct 28
    272
    QtyArrives
    72 Mon, Oct 28
    200 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • 1 Zone Switching Relay Product Image
    Add to List
    Add to List
    1 Zone Switching Relay SR501-EXP-4 1 Zone Switching Relay
    SKU: SR501-EXP-4
    Brand: Taco
    (24)
    $114.99 each
    $335.97 box of 3
    $111.99 each
    12
    Mon, Oct 28
    21
    QtyArrives
    12 Mon, Oct 28
    9 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • 3 Zone Switching Relay<br>w/ Priority Product Image
    Add to List
    Add to List
    3 Zone Switching Relay w/ Priority SR503-EXP-4 3 Zone Switching Relay w/ Priority
    SKU: SR503-EXP-4
    Brand: Taco
    (24)
    $129.99 each
    $249.98 box of 2
    $124.99 each
    77
    Mon, Oct 28
    228
    QtyArrives
    77 Mon, Oct 28
    151 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • 4 Zone Switching Relay<br>w/ Priority Product Image
    Add to List
    Add to List
    4 Zone Switching Relay w/ Priority SR504-EXP-4 4 Zone Switching Relay w/ Priority
    SKU: SR504-EXP-4
    Brand: Taco
    (24)
    $169.99 each
    $325.58 box of 2
    $162.79 each
    72
    Mon, Oct 28
    137
    QtyArrives
    72 Mon, Oct 28
    65 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • 6 Zone Switching Relay<br>w/ Priority Product Image
    Add to List
    Add to List
    6 Zone Switching Relay w/ Priority SR506-EXP-4 6 Zone Switching Relay w/ Priority
    SKU: SR506-EXP-4
    Brand: Taco
    (8)
    $213.29 each
    $422.38 box of 2
    $211.19 each
    74
    Mon, Oct 28
    177
    QtyArrives
    74 Mon, Oct 28
    103 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • 24v Replacement Relay Product Image
    Add to List
    Add to List
    24v Replacement Relay SR024-001RP 24v Replacement Relay
    SKU: SR024-001RP
    Brand: Taco
    (6)
    $23.99 each
    $137.94 box of 6
    $22.99 each
    76
    Mon, Oct 28
    125
    QtyArrives
    76 Mon, Oct 28
    49 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • FuelMizer SR501-OR-4 Switching Relay with Outdoor Reset Product Image
    Add to List
    Add to List
    FuelMizer SR501-OR-4 Switching Relay with Outdoor Reset SR501-OR-4 FuelMizer SR501-OR-4 Switching Relay with Outdoor Reset
    SKU: SR501-OR-4
    Brand: Taco
    (6)
    $145.99 each
    $419.97 box of 3
    $139.99 each
    4
    Mon, Oct 28
    21
    QtyArrives
    4 Mon, Oct 28
    17 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • 120v Replacement Relay Product Image
    Add to List
    Add to List
    120v Replacement Relay SR120-001RP 120v Replacement Relay
    SKU: SR120-001RP
    Brand: Taco
    (1)
    $22.99 each
    $132.54 box of 6
    $22.09 each
    17
    Mon, Oct 28
    55
    QtyArrives
    17 Mon, Oct 28
    38 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • Taco Boiler Reset Control Product Image
    Add to List
    Add to List
    Taco Boiler Reset Control PC700-2 Taco Boiler Reset Control
    SKU: PC700-2
    Brand: Taco
    (3)
    $227.99 each
    8
    Mon, Oct 28
    23
    QtyArrives
    8 Mon, Oct 28
    15 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • Taco Boiler Reset Control 2-Stage Product Image
    Add to List
    Add to List
    Taco Boiler Reset Control 2-Stage PC702-1 Taco Boiler Reset Control 2-Stage
    SKU: PC702-1
    Brand: Taco
    (1)
    $285.99 each
    1
    Tue, Oct 29 – Wed, Oct 30
    1
    QtyArrives
    1 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • Taco PC705 Variable Speed Pump Control Product Image
    Add to List
    Add to List
    Taco PC705 Variable Speed Pump Control PC705-2 Taco PC705 Variable Speed Pump Control
    SKU: PC705-2
    Brand: Taco
    (2)
    $322.99 each
    3
    Mon, Oct 28
    12
    QtyArrives
    3 Mon, Oct 28
    9 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • Replacement Fuse - <br>1 Amp (10 Pack) Product Image
    Add to List
    Add to List
    Replacement Fuse - 1 Amp (10 Pack) SR1A-001RP Replacement Fuse - 1 Amp (10 Pack)
    SKU: SR1A-001RP
    Brand: Taco
    $15.99 each
    $152.90 box of 10
    $15.29 each
    10
    Mon, Oct 28
    38
    QtyArrives
    10 Mon, Oct 28
    28 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • Replacement Fuse - <br>5 Amp (10 Pack) Product Image
    Add to List
    Add to List
    Replacement Fuse - 5 Amp (10 Pack) SR5A-005RP Replacement Fuse - 5 Amp (10 Pack)
    SKU: SR5A-005RP
    Brand: Taco
    (2)
    $13.69 each
    $130.90 box of 10
    $13.09 each
    78
    Mon, Oct 28
    114
    QtyArrives
    78 Mon, Oct 28
    36 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • Replacement Fuse - <br>6 Amp (10 Pack) Product Image
    Add to List
    Add to List
    Replacement Fuse - 6 Amp (10 Pack) SR6A-001RP Replacement Fuse - 6 Amp (10 Pack)
    SKU: SR6A-001RP
    Brand: Taco
    (4)
    $17.99 each
    $171.90 box of 10
    $17.19 each
    40
    Mon, Oct 28
    84
    QtyArrives
    40 Mon, Oct 28
    44 Tue, Oct 29 – Wed, Oct 30
    Questions? Call 1-888-757-4774
    Add to List
  • 2 Zone 120V Switching Relay with DPST switching Product Image
    Add to List
    Add to List
    2 Zone 120V Switching Relay with DPST switching RA832A1066 2 Zone 120V Switching Relay with DPST switching
    SKU: RA832A1066
    Brand: Honeywell
    (25)
    $75.89 each
    $295.96 box of 4
    $73.99 each
    645
    Mon, Oct 28
    645
    QtyArrives
    645 Mon, Oct 28
    Questions? Call 1-888-757-4774
    Add to List
  • 1 Zone 120V Switching Relay w/ Internal Transformer, 1 SPST Product Image
    Add to List
    Add to List
    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
    (11)
    $60.99 each
    $117.98 box of 2
    $58.99 each
    271
    Mon, Oct 28
    271
    QtyArrives
    271 Mon, Oct 28
    Questions? Call 1-888-757-4774
    Add to List
  • Switching Relay w/ Internal Transformer DPST Line Voltage Relays Product Image
    Add to List
    Add to List
    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
    $224.97 box of 3
    $74.99 each
    348
    Mon, Oct 28
    348
    QtyArrives
    348 Mon, Oct 28
    Questions? Call 1-888-757-4774
    Add to List
  • Universal Switching Relay w/ Internal Transformer Product Image
    Add to List
    Add to List
    Universal Switching Relay w/ Internal Transformer R8845U1003 Universal Switching Relay w/ Internal Transformer
    SKU: R8845U1003
    Brand: Honeywell
    (17)
    $58.99 each
    $113.98 box of 2
    $56.99 each
    363
    Mon, Oct 28
    363
    QtyArrives
    363 Mon, Oct 28
    Questions? Call 1-888-757-4774
    Add to List
  • 120V, 60 Hz Switching Relay with SPDT switching Product Image
    Add to List
    Add to List
    120V, 60 Hz Switching Relay with SPDT switching RA889A1001 120V, 60 Hz Switching Relay with SPDT switching
    SKU: RA889A1001
    Brand: Honeywell
    (6)
    $54.89 each
    $268.95 box of 5
    $53.79 each
    62
    Mon, Oct 28
    62
    QtyArrives
    62 Mon, Oct 28
    Questions? Call 1-888-757-4774
    Add to List

Resources

Videos

Articles

  • 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, Bell & Gossett, and Erie switching relays for residential and light commercial applications.
1-888-757-4774
We're here to help
()
Monday – Thursday
8am–7:45pm ET
Friday
9am–7:45pm ET
  • Product Image

  • Product Image

    Select 2 to 3 items to compare

  • Product Image

    Compare up to 1 more item

Why don't we show the price of this item?

We try to always offer you the lowest prices possible, but some manufacturers require that we only show these low prices once you take further action.

To see the price, simply add the item to your cart or sign in.