Free shipping for orders over $290.63
Skip to content
100%
Behind what we sell,
by offering one year warranty
SAME DAY SHIPPING
CUT-OFF TIME 3PM EST
LET US BE YOUR  NEXT SECURITY  PARTNER
Next Security, LLC BBB Business Review
LET US BE YOUR  NEXT SECURITY PARTNER

SYSTEM SENSOR

Filters

  • 2151 SYSTEM SENSOR

    SYSTEM SENSOR
    $77.35 - $77.35
    $77.35
    $77.35 - $77.35
    $77.35
    DISCONTINUED

    Smoke Detector Head, Photo, Low-Profile

    $77.35 - $77.35
    $77.35
    $77.35 - $77.35
    $77.35
  • Sold out

    2D51 SYSTEM SENSOR

    SYSTEM SENSOR
    $105.85 - $105.85
    $105.85
    $105.85 - $105.85
    $105.85

    4- WIRE DUCT PHOTO DETECTOR HEAD

    $105.85 - $105.85
    $105.85
    $105.85 - $105.85
    $105.85
    Sold out
  • Sold out

    2W-B SYSTEM SENSOR

    SYSTEM SENSOR
    $55.53 - $55.53
    $55.53
    $55.53 - $55.53
    $55.53

    i3 smoke detector, 2-wire photoelectric with base

    $55.53 - $55.53
    $55.53
    $55.53 - $55.53
    $55.53
    Sold out

  • 2WT-B SYSTEM SENSOR

    SYSTEM SENSOR
    $72.86 - $72.86
    $72.86
    $72.86 - $72.86
    $72.86

    I³ PHOTO DETECTOR, 2-WIRE, 12/24 VDC, PHOTO THERMAL

    $72.86 - $72.86
    $72.86
    $72.86 - $72.86
    $72.86
  • Sold out

    2WTA-B SYSTEM SENSOR

    SYSTEM SENSOR
    $93.09 - $93.09
    $93.09
    $93.09 - $93.09
    $93.09

    2-Wire Photoelectric Smoke Detector

    $93.09 - $93.09
    $93.09
    $93.09 - $93.09
    $93.09
    Sold out

  • 2WTR-B SYSTEM SENSOR

    SYSTEM SENSOR
    $84.59 - $84.59
    $84.59
    $84.59 - $84.59
    $84.59

    I3 PHOTO DETECTOR, PLUG-IN, 2-WIRE, 12/24 VDC, 135 °F THERMAL, FORM-C RELAY.

    $84.59 - $84.59
    $84.59
    $84.59 - $84.59
    $84.59
  • Sold out

    4W-B SYSTEM SENSOR

    SYSTEM SENSOR
    $57.75 - $57.75
    $57.75
    $57.75 - $57.75
    $57.75

    4-wire Photoelectric i3 Smoke Detector

    $57.75 - $57.75
    $57.75
    $57.75 - $57.75
    $57.75
    Sold out
  • Sold out

    4WT-B SYSTEM SENSOR

    SYSTEM SENSOR
    $74.40 - $74.40
    $74.40
    $74.40 - $74.40
    $74.40

    I³ PHOTO DETECTOR, 4-WIRE, 12/24 VDC, PHOTO THERMAL.

    $74.40 - $74.40
    $74.40
    $74.40 - $74.40
    $74.40
    Sold out
  • Sold out

    4WTA-B SYSTEM SENSOR

    SYSTEM SENSOR
    $105.21 - $105.21
    $105.21
    $105.21 - $105.21
    $105.21

    Photoelectric Smoke and Heat Detector / Sounder

    $105.21 - $105.21
    $105.21
    $105.21 - $105.21
    $105.21
    Sold out
  • Sold out

    4WTAR-B SYSTEM SENSOR

    SYSTEM SENSOR
    $121.43 - $121.43
    $121.43
    $121.43 - $121.43
    $121.43

    I3 PHOTO DETECTOR, PLUG-IN, 4-WIRE, 12/24 VDC, 135 °F THERMAL, TEMPORAL 85 DBA SOUNDER, FORM-C RELAY.

    $121.43 - $121.43
    $121.43
    $121.43 - $121.43
    $121.43
    Sold out
  • Sold out

    4WTR-B SYSTEM SENSOR

    SYSTEM SENSOR
    $89.95 - $89.95
    $89.95
    $89.95 - $89.95
    $89.95

    4-wire, photoelectric i3 smoke detector with thermal sensor and Form C relay.

    $89.95 - $89.95
    $89.95
    $89.95 - $89.95
    $89.95
    Sold out
  • Sold out

    5151 SYSTEM SENSOR

    SYSTEM SENSOR
    $50.11 - $50.11
    $50.11
    $50.11 - $50.11
    $50.11

    100 SERIES PLUG-IN TERMINAL

    $50.11 - $50.11
    $50.11
    $50.11 - $50.11
    $50.11
    Sold out

  • 5251H SYSTEM SENSOR

    SYSTEM SENSOR
    $160.69 - $160.69
    $160.69
    $160.69 - $160.69
    $160.69

    ADDRESSABLE HEAT DETECTOR HEAD, 190F FIXED, REQUIRES BASE

    $160.69 - $160.69
    $160.69
    $160.69 - $160.69
    $160.69
  • Sold out

    5601P SYSTEM SENSOR

    SYSTEM SENSOR
    $27.16
    $27.16 - $27.16
    $27.16
    $24.28
    $24.28 - $24.28
    $24.28

    135 °F (57° C) FIXED AND RATE-OF-RISE. (PLAIN)

    $27.16
    $27.16 - $27.16
    $27.16
    $24.28
    $24.28 - $24.28
    $24.28
    Sold out
  • Sold out

    5602 SYSTEM SENSOR

    SYSTEM SENSOR
    $25.33 - $25.33
    $25.33
    $25.33 - $25.33
    $25.33

    SINGLE CIRCUIT 194"F(90"C) RATE OF RISE AND FIXED TEMP

    $25.33 - $25.33
    $25.33
    $25.33 - $25.33
    $25.33
    Sold out

  • 5603 SYSTEM SENSOR

    SYSTEM SENSOR
    $23.95 - $23.95
    $23.95
    $23.95 - $23.95
    $23.95

    135°F FIXED TEMPERATURE....CAN REPLACE 283B-PL

    $23.95 - $23.95
    $23.95
    $23.95 - $23.95
    $23.95
  • Sold out

    5604 SYSTEM SENSOR

    SYSTEM SENSOR
    $23.57 - $23.57
    $23.57
    $23.57 - $23.57
    $23.57

    194 °F (90° C) fixed temperature.

    $23.57 - $23.57
    $23.57
    $23.57 - $23.57
    $23.57
    Sold out

  • 5621 SYSTEM SENSOR

    SYSTEM SENSOR
    $56.81 - $56.81
    $56.81
    $56.81 - $56.81
    $56.81

    135°F FIXED TEMPERATURE

    $56.81 - $56.81
    $56.81
    $56.81 - $56.81
    $56.81

  • 5622 SYSTEM SENSOR

    SYSTEM SENSOR
    $45.28 - $45.28
    $45.28
    $45.28 - $45.28
    $45.28

    DUAL CIRCUITE 194°F FIXED TEMPERATURE RATE OF RISE

    $45.28 - $45.28
    $45.28
    $45.28 - $45.28
    $45.28
  • Sold out

    5623 SYSTEM SENSOR

    SYSTEM SENSOR
    $47.87 - $47.87
    $47.87
    $47.87 - $47.87
    $47.87

    135°F FIXED HEAT DETECTOR TEMP ONLY

    $47.87 - $47.87
    $47.87
    $47.87 - $47.87
    $47.87
    Sold out

  • 5624 SYSTEM SENSOR

    SYSTEM SENSOR
    $42.06 - $42.06
    $42.06
    $42.06 - $42.06
    $42.06

    194 °F (90° C) FIXED TEMPERATURE, DUAL CIRCUIT, NORMALLY OPEN

    $42.06 - $42.06
    $42.06
    $42.06 - $42.06
    $42.06
  • Sold out

    6500-MMK-US SYSTEM SENSOR

    SYSTEM SENSOR
    $205.58 - $205.58
    $205.58
    $205.58 - $205.58
    $205.58

    MULTI MOUNT KIT

    $205.58 - $205.58
    $205.58
    $205.58 - $205.58
    $205.58
    Sold out
  • Sold out

    72377B-801 SYSTEM SENSOR

    SYSTEM SENSOR
    $442.04 - $442.04
    $442.04
    $442.04 - $442.04
    $442.04

    WALL / POLE MOUNTING BRACKET FOR TCPA-10 SERIES

    $442.04 - $442.04
    $442.04
    $442.04 - $442.04
    $442.04
    Sold out

  • A77-01-02 SYSTEM SENSOR

    SYSTEM SENSOR
    $58.11 - $58.11
    $58.11
    $58.11 - $58.11
    $58.11

    Replacement terminal block kit for WFD series waterflow detectors.

    $58.11 - $58.11
    $58.11
    $58.11 - $58.11
    $58.11

  • B110RLP SYSTEM SENSOR

    SYSTEM SENSOR
    $27.38 - $27.38
    $27.38
    $27.38 - $27.38
    $27.38
    DISCONTINUED

    B110RLP is a 2-wire base with a 470 Ohm current limiting resistor for use with 100 Series smoke detectors.

    $27.38 - $27.38
    $27.38
    $27.38 - $27.38
    $27.38
  • Sold out

    B112LP SYSTEM SENSOR

    SYSTEM SENSOR
    $51.56 - $51.56
    $51.56
    $51.56 - $51.56
    $51.56
    DISCONTINUED

    BASE, 4-WIRE, LOW-PROFILE, FORM-A&C, 24VDC

    $51.56 - $51.56
    $51.56
    $51.56 - $51.56
    $51.56
    Sold out
  • Sold out

    B114LP SYSTEM SENSOR

    SYSTEM SENSOR
    $149.10 - $149.10
    $149.10
    $149.10 - $149.10
    $149.10

    BASE 6.0" 4W RLY (FIRELITE)

    $149.10 - $149.10
    $149.10
    $149.10 - $149.10
    $149.10
    Sold out
  • Sold out

    B114LPBT SYSTEM SENSOR

    SYSTEM SENSOR
    $127.69 - $127.69
    $127.69
    $127.69 - $127.69
    $127.69

    BASE 6.0" FOR 2151

    $127.69 - $127.69
    $127.69
    $127.69 - $127.69
    $127.69
    Sold out
  • Sold out

    B200S SYSTEM SENSOR

    SYSTEM SENSOR
    $119.61
    $119.61 - $119.61
    $119.61
    $118.48
    $118.48 - $118.48
    $118.48

    Addressable, Synchronizable, Intelligent Sounder base designed for new and existing dwelling unit applications.

    $119.61
    $119.61 - $119.61
    $119.61
    $118.48
    $118.48 - $118.48
    $118.48
    Sold out
  • Sold out

    B200S-IV SYSTEM SENSOR

    SYSTEM SENSOR
    $119.60 - $119.60
    $119.60
    $119.60 - $119.60
    $119.60
    DISCONTINUED

    INTELLIGENT, ADDRESSABLE, PROGRAMMABLE PLUG-IN SOUNDER BASE HIGH OR LOW VOLUME OUTPUT WITH ANSI TEMPORAL 3 OR TEMPORAL 4, CONTINUOUS, MARCH OR CUST...

    View full details
    $119.60 - $119.60
    $119.60
    $119.60 - $119.60
    $119.60
    Sold out
  • Sold out

    B200S-LF-IV SYSTEM SENSOR

    SYSTEM SENSOR
    $161.75 - $161.75
    $161.75
    $161.75 - $161.75
    $161.75
    DISCONTINUED

    INTELLIGENT, ADDRESSABLE, PROGRAMMABLE LOW FREQUENCY PLUG-IN SOUNDER BASE. HIGH OR LOW VOLUME OUTPUT WITH ANSI TEMPORAL 3 OR TEMPORAL 4, CONTINUOUS...

    View full details
    $161.75 - $161.75
    $161.75
    $161.75 - $161.75
    $161.75
    Sold out
  • Sold out

    B200S-LF-WH SYSTEM SENSOR

    SYSTEM SENSOR
    $134.11 - $134.11
    $134.11
    $134.11 - $134.11
    $134.11

    INTELLIGENT, ADDRESSABLE, PROGRAMMABLE LOW FREQUENCY PLUG-IN SOUNDER BASE. HIGH OR LOW VOLUME OUTPUT WITH ANSI TEMPORAL 3 OR TEMPORAL 4, CONTINUOUS...

    View full details
    $134.11 - $134.11
    $134.11
    $134.11 - $134.11
    $134.11
    Sold out
  • Sold out

    B200S-WH SYSTEM SENSOR

    SYSTEM SENSOR
    $86.29
    $86.29 - $86.29
    $86.29
    $83.33
    $83.33 - $83.33
    $83.33

    INTELLIGENT, ADDRESSABLE, PROGRAMMABLE PLUG-IN SOUNDER BASE HIGH OR LOW VOLUME OUTPUT WITH ANSI TEMPORAL 3 OR TEMPORAL 4, CONTINUOUS, MARCH OR CUST...

    View full details
    $86.29
    $86.29 - $86.29
    $86.29
    $83.33
    $83.33 - $83.33
    $83.33
    Sold out
  • Sold out

    B200SR-IV SYSTEM SENSOR

    SYSTEM SENSOR
    $93.77 - $93.77
    $93.77
    $93.77 - $93.77
    $93.77
    DISCONTINUED

    INTELLIGENT PLUG-IN SOUNDER BASE WITH ANSI TEMPORAL 3 OR CONTINUOUS TONE; IVORY

    $93.77 - $93.77
    $93.77
    $93.77 - $93.77
    $93.77
    Sold out

  • B200SR-LF-IV SYSTEM SENSOR

    SYSTEM SENSOR
    $183.51 - $183.51
    $183.51
    $183.51 - $183.51
    $183.51
    DISCONTINUED

    Addressable Low Frequency Sounder Base, Ivory

    $183.51 - $183.51
    $183.51
    $183.51 - $183.51
    $183.51

  • B200SR-LF-WH SYSTEM SENSOR

    SYSTEM SENSOR
    $144.65 - $144.65
    $144.65
    $144.65 - $144.65
    $144.65

    INTELLIGENT LOW-FREQUENCY PLUG-IN SUNDER BASE WITH ANSI TEMPORAL 3 OR CONTINOUS TONE; WHITE

    $144.65 - $144.65
    $144.65
    $144.65 - $144.65
    $144.65

  • B200SR-WH SYSTEM SENSOR

    SYSTEM SENSOR
    $97.49 - $97.49
    $97.49
    $97.49 - $97.49
    $97.49

    INTELLIGENT PLUG-IN SOUNDER BASE WITH ANSI TEMPORAL 3 OR CONTINUOUS TONE; WHITE

    $97.49 - $97.49
    $97.49
    $97.49 - $97.49
    $97.49

  • B224BI SYSTEM SENSOR

    SYSTEM SENSOR
    $65.77 - $65.77
    $65.77
    $65.77 - $65.77
    $65.77
    DISCONTINUED

    INTELLIGENT ISOLATOR BASE

    $65.77 - $65.77
    $65.77
    $65.77 - $65.77
    $65.77

  • B224BI-IV SYSTEM SENSOR

    SYSTEM SENSOR
    $24.18 - $24.18
    $24.18
    $24.18 - $24.18
    $24.18
    DISCONTINUED

    ISOLATOR BASE; IVORY

    $24.18 - $24.18
    $24.18
    $24.18 - $24.18
    $24.18

  • B224BI-WH SYSTEM SENSOR

    SYSTEM SENSOR
    $68.39 - $68.39
    $68.39
    $68.39 - $68.39
    $68.39

    INTELLIGENT ISOLATOR BASE; WHITE

    $68.39 - $68.39
    $68.39
    $68.39 - $68.39
    $68.39

  • B224RB SYSTEM SENSOR

    SYSTEM SENSOR
    $65.96 - $65.96
    $65.96
    $65.96 - $65.96
    $65.96
    DISCONTINUED

    SENSOR INTELLIGENT RELAY BASE

    $65.96 - $65.96
    $65.96
    $65.96 - $65.96
    $65.96
  • Sold out

    B224RB-IV SYSTEM SENSOR

    SYSTEM SENSOR
    $54.77 - $54.77
    $54.77
    $54.77 - $54.77
    $54.77
    DISCONTINUED

    INTELLIGENT RELAY BASE; IVORY

    $54.77 - $54.77
    $54.77
    $54.77 - $54.77
    $54.77
    Sold out

  • B224RB-WH SYSTEM SENSOR

    SYSTEM SENSOR
    $70.15 - $70.15
    $70.15
    $70.15 - $70.15
    $70.15

    REPLACEMENT FOR B224RB

    $70.15 - $70.15
    $70.15
    $70.15 - $70.15
    $70.15

  • B300-6 SYSTEM SENSOR

    SYSTEM SENSOR
    $10.40 - $10.40
    $10.40
    $10.40 - $10.40
    $10.40

    6" BASE LOW-PROFILE, STANDARD FLANGED, WHITE

    $10.40 - $10.40
    $10.40
    $10.40 - $10.40
    $10.40
  • Sold out

    B300-6-IV SYSTEM SENSOR

    SYSTEM SENSOR
    $22.28 - $22.28
    $22.28
    $22.28 - $22.28
    $22.28
    DISCONTINUED

    6" BASE; IVORY

    $22.28 - $22.28
    $22.28
    $22.28 - $22.28
    $22.28
    Sold out
  • Sold out

    B406B SYSTEM SENSOR

    SYSTEM SENSOR
    $45.34 - $45.34
    $45.34
    $45.34 - $45.34
    $45.34
    DISCONTINUED

    Conventional Plug-In Detector BaseCompatible with detectors 1451 / 2451 / 2451TH / 5451

    $45.34 - $45.34
    $45.34
    $45.34 - $45.34
    $45.34
    Sold out

  • B501 SYSTEM SENSOR

    SYSTEM SENSOR
    $6.05 - $6.05
    $6.05
    $6.05 - $6.05
    $6.05
    DISCONTINUED

    INTELLIGENT DETECTOR BASE WITHOUT FLANGE; IVORY; SOLD WITHOUT INDIVIDUAL PACKAGING.

    $6.05 - $6.05
    $6.05
    $6.05 - $6.05
    $6.05

  • B501-IV SYSTEM SENSOR

    SYSTEM SENSOR
    $25.26 - $25.26
    $25.26
    $25.26 - $25.26
    $25.26
    DISCONTINUED

    INTELLIGENT 4" DETECTOR BASE, WITHOUT FLANGE, IVORY

    $25.26 - $25.26
    $25.26
    $25.26 - $25.26
    $25.26