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  • Kidde | 302 Series Rate Compensation All-Weather Heat Detector, 194F Fixed Temperature, Vertical Box Mount, 1/2" NPT, FM & UL Listed | 302-ET-194
302 Series Rate Compensation All-Weather Heat Detector, 194F Fixed Temperature, Vertical Box Mount, 1/2" NPT, FM & UL Listed
Kidde Commercial

302 Series Rate Compensation All-Weather Heat Detector, 194F Fixed Temperature, Vertical Box Mount, 1/2" NPT, FM & UL Listed

SKU KD-302-ET-194

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The Kidde 302-ET-194 is a rate compensation heat detector rated at 194F (90C) for all-weather installations where moisture, dust, or condensation would compromise a standard detector. Its hermetically sealed construction and plastic hex-grip bushing with 1/2" NPT conduit threads let you mount directly to a threaded hub cover or standard outlet box - no special backbox required.

Built for the commercial fire alarm installer

The 302-ET series handles indoor and outdoor applications where a watertight seal is critical. Rate compensation technology offsets the thermal lag inherent in conventional fixed-temperature detectors, improving response time during fast-rising fire conditions without false alarms from normal temperature swings. The detector is self-restoring - once ambient temperature drops below the rated threshold, the contacts open automatically without manual reset. FM and UL listed, MEA accepted.

Key features

  • Rate compensation: offsets thermal lag for faster, more accurate response to genuine fire conditions
  • All-weather construction: hermetically sealed against moisture, dust, and internal condensation
  • Self-restoring: contacts reset automatically when temperature drops below 194F - no manual reset needed
  • 1/2" NPT box mount: plastic hex-grip bushing threads directly into hub covers or standard outlet boxes
  • FM & UL listed: approved for commercial fire alarm systems with verified spacing tables
  • Wide operating range: functions down to -40F, suitable for cold storage and exterior installations

System requirements

Normally-open contact design - wires in series on a conventional two-wire initiating circuit with end-of-line resistor. Rated for 6-125 VAC (5A) and 6-25 VDC (1A). Requires a STONCO27 or equivalent weatherproof box for outdoor installations. Maximum ceiling temperature for the 194F model is 150F (66C).

Specifications

SKUKD-302-ET-194
BrandKidde Commercial
Form factorVertical box mount heat detector, 1/2" NPT
Detection typeRate compensation, fixed temperature 194°F (90°C)
Contact typeNormally open, self-restoring
Electrical rating6-125 VAC / 5A, 6-25 VDC / 1A, 125 VDC / 0.5A
Operating temp-40°F (-40°C) to 150°F (66°C) max ceiling
Tube length3" (76.2 mm)
Tube diameter0.5" (12.7 mm)
NPT thread1/2" (12.7 mm)
Hex base1" (25.4 mm) plastic
UL spacing (vertical)50' x 50' (15.2 x 15.2 m)
UL spacing (horizontal)40' x 40' (12.2 x 12.2 m)
FM spacing30' x 30' (9.1 x 9.1 m)
ConstructionHermetically sealed, anodized aluminum shell
ComplianceFM, UL, MEA
Required accessoriesSTONCO27 or equivalent weatherproof box
Ship weight0.2 lb (0.09 kg)

Documents and resources

FAQs

Does this detector require manual reset after activation?
No. The 302-ET-194 is self-restoring. When the surrounding air temperature drops below 194°F, the outer shell contracts and the contacts open automatically. No reset button, no truck roll.
Can I use this detector outdoors?
Yes. The 302-ET model is hermetically sealed and rated for all-weather use. For outdoor installations requiring a watertight seal, mount it in a STONCO27 or equivalent weatherproof box with the 1/2" NPT threaded entry.
What is rate compensation and why does it matter?
Rate compensation offsets thermal lag in fixed-temperature detectors. In a fast fire, the outer shell expands faster than the internal struts, closing contacts at or before the rated temperature. Faster detection without false alarms.
What spacing should I use for FM-approved installations?
FM spacing is 30' x 30' (9.1 x 9.1 m) on smooth ceilings up to 10' high. UL vertical is 50' x 50', UL horizontal is 40' x 40'. Refer to NFPA 72 for high or beamed ceilings.
What wiring does the 302-ET-194 require?
Normally-open, two-wire device. Wire in series on a conventional initiating circuit with end-of-line resistor. Rated for 6-125 VAC (5A) or 6-25 VDC (1A). Standard fire alarm circuit practice.
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