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  • Kidde | 302 Series Rate Compensation Heat Detector, 135°F Fixed Temperature, FM & UL Listed, Interior Surface Mount | 302-135

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Kidde | 302 Series Rate Compensation Heat Detector, 135°F Fixed Temperature, FM & UL Listed, Interior Surface Mount | 302-135

Kidde | 302 Series Rate Compensation Heat Detector, 135°F Fixed Temperature, FM & UL Listed, Interior Surface Mount | 302-135

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SKU:
KD-302-135

The Kidde 302-135 is a rate compensation heat detector rated at 135°F (57.2°C) for interior vertical surface mount applications. Rate compensation offsets the thermal lag inherent in conventional fixed-temperature detectors, improving response time on both slow and fast temperature rises without false alarms from normal ambient fluctuations.

Built for the commercial fire alarm installer

FM and UL listed with MEA acceptance, the 302-135 drops into conventional two-wire fire alarm circuits as a normally-open initiating device. Hermetically sealed, shock and corrosion resistant, and tamperproof - built for environments where reliability matters and maintenance access is limited. Self-restoring operation means no truck roll to manually reset after activation; the detector resets automatically once temperatures drop below the rated threshold.

Key features

  • Rate compensation design: responds accurately to both slow-building and fast-rising heat events, offsetting the thermal lag that trips up conventional fixed-temperature detectors
  • Self-restoring: no manual reset required after activation - contacts open automatically when temperature drops below rated level
  • Hermetically sealed construction: shock resistant, corrosion resistant, and tamperproof for low-maintenance installations
  • FM and UL listed: 50' x 50' vertical spacing, 40' x 40' horizontal spacing (UL); 30' x 30' (FM) on smooth ceilings up to 10'
  • Simple two-wire wiring: normally-open contact ties directly to the conventional fire alarm initiating circuit
  • Low maintenance: dust and dirt accumulation does not affect sensor operation

System requirements

Connects to any conventional fire alarm control panel via standard two-wire initiating circuit with end-of-line resistor. For interior mounting in environments where ambient ceiling temperature does not exceed 100°F (38°C). Optional AP-P adapter plate available for mounting to 3" or 4" octagon outlet boxes.

Brand:
Kidde Commercial
Form factor:
Interior vertical surface mount heat detector
Detection type:
Rate compensation, fixed temperature
Temperature rating:
135°F (57.2°C)
Electrical rating:
6-125 VAC / 5A, 6-25 VDC / 1A, 125 VDC / 0.5A
Circuit type:
Normally-open, two-wire conventional
Operating temp:
-40°F (-40°C) minimum ambient
Maximum ceiling temp:
100°F (38°C)
UL vertical spacing:
50' x 50' (15.2 x 15.2 m)
UL horizontal spacing:
40' x 40' (12.2 x 12.2 m)
FM spacing:
30' x 30' (9.1 x 9.1 m)
Construction:
Anodized aluminum shell, fine silver contacts
Listings:
FM, UL, MEA
Mounting:
Surface mount; AP-P adapter plate for 3" or 4" octagon outlet box
Ship weight:
0.2 lb (0.09 kg)
What is rate compensation and why does it matter?
Rate compensation offsets thermal lag in fixed-temp detectors. The outer shell expands faster than internal struts on fast fires, activating closer to rated temp. On slow fires, responds at fixed rating. Better accuracy across all fire growth rates.
Does the 302-135 require manual reset after activation?
No. The 302-135 is self-restoring. Once the ambient temperature drops below the rated threshold, the contacts open automatically. No truck roll or manual intervention required.
What detector spacing should I use?
UL spacing: 50' x 50' on vertical surfaces, 40' x 40' on horizontal surfaces (smooth ceilings up to 10' high). FM spacing: 30' x 30'. Always consult NFPA 72 and the local AHJ for site-specific spacing requirements.
What wiring does the 302-135 need?
Standard two-wire conventional initiating circuit. The detector has a normally-open contact that closes on heat activation. Wire colors are black and white. Requires an end-of-line resistor per your FACP's specifications.
Can this detector be used outdoors?
No. The 302-135 is listed for interior mounting only. For exterior or weather-exposed locations, consider the 302-AW (weather-resistant) or 302-ET (explosion-proof) variants.
How do I test this detector?
Per NFPA 72, use a UL-listed heat source (hair dryer) held 6-8 inches from the shell. Do not use open flame. The detector self-restores after testing - no manual reset needed.

Spec Sheet

Download File

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