435548 Detector, Series (Scissor Linkage) (25 Pack)

The Ansul 435548 is a 25-pack of Series heat detectors with scissor-style linkage, used in ANSUL suppression systems to trigger mechanical release when fusible links melt. In plain terms: this is the heat detection component that "pulls the trigger" on the suppression system when a fire gets hot enough above the cooking equipment. The scissor linkage holds the detection cable under tension when the fusible link in the center of the scissor assembly melts from the heat of a fire, the scissor collapses, releasing the cable tension and allowing the Automan control head to initiate system discharge.

The scissor linkage design holds two fusible link elements in a compact bracket that mounts above the protected appliance. When either fusible link melts, the scissor mechanism opens and releases the actuation cable. This design provides a clean, reliable mechanical release with minimal friction important because any binding in the detection linkage can delay system activation. The 25-pack quantity provides sufficient detectors for multiple ANSUL R-102 system installations or for restocking a service vehicle that performs semi-annual inspection replacements across multiple accounts.

Per NFPA 17A and NFPA 96, fusible link detectors must be replaced at every semi-annual inspection they are not reusable and must never be reinstalled after removal. The 435548 25-pack makes this mandatory replacement cost-effective for high-volume service operations. Available through authorized ANSUL distributors. After replacing all detectors, re-tension the detection cable per the ANSUL R-102 system documentation before returning the system to armed service.

Replace all 435548 detectors at every semi-annual NFPA 17A and NFPA 96 inspection. This is mandatory regardless of condition. Even if the fusible links haven't melted, repeated exposure to the heat cycles of a commercial kitchen can degrade the link's rated melt temperature over time, causing it to trigger at a lower temperature than designed or to become desensitized and fail to trigger at the correct temperature. Fresh detectors at every semi-annual inspection ensure the detection temperature rating is always within specification. Re-tension the detection cable after installation and document all detector replacements in the fire suppression system inspection record.

What temperature rating are these detectors?

Verify the specific temperature rating of the 435548 Series detector using the ANSUL parts documentation or by consulting authorized ANSUL distributors. ANSUL detector temperature ratings are selected based on the normal operating temperature above each type of cooking appliance. Detectors over high-heat fryers use a higher temperature rating than detectors over lower-heat appliances. Always confirm the correct temperature rating for your specific appliance and detector position before installation.

Can I reuse detectors that haven't melted?

No. NFPA 17A and NFPA 96 require replacement at every semi-annual inspection regardless of condition. The 25-pack format makes this replacement economical. Never reuse removed detectors even if they look undamaged, the internal fusible link elements may have been affected by heat cycling and the mechanical linkage may have taken a set that affects its release characteristics.