Fenwal Detector 12-G27121-000-450F

Fenwal Detector 12-G27121-000-450F

The Fenwal 12-G27121-000-450F is a rate-compensated thermal (heat) fire detector from the Detect-A-Fire® series. It is designed for industrial fire protection, activating fire alarms or suppression systems when ambient temperature reaches 450°F (232°C) .


Key Features

  • Rate-Compensated Design – Accurately senses air temperature regardless of fire growth rate, reducing false alarms common with standard rate-of-rise detectors 

  • Normally Open (NO) Contacts – Closes on temperature rise to activate alarms or extinguishing systems 

  • Vertical Mount – Designed for vertical installation 

  • Explosion-Proof Rating – Suitable for hazardous locations: Class I, Groups B, C, D; Class II, Groups E, F, G (when mounted in approved junction box) 

  • Hermetically Sealed – Factory set, self-restoring stainless steel element for durability 

  • Approvals – UL, cUL, and FM listed 


Technical Specifications

ParameterValue
Model12-G27121-000-450F
Activation Temperature450°F (232°C)
Contact TypeNormally Open (closes on rise)
MountingVertical
Electrical Rating5.0 A @ 125 VAC / 0.5 A @ 125 VDC / 2.0 A @ 24 VDC 
Shell MaterialStainless Steel
Mounting HeadBrass
ApprovalsUL, ULC, FM 
Explosion-Proof RatingClass I, Groups B, C, D; Class II, Groups E, F, G 
Self-RestoringYes 

Applications

  • Fire suppression systems (clean agents, CO₂, water, dry chemicals) 

  • Industrial process and equipment overheat protection

  • Hazardous area fire detection 

  • Power generation and engine compartments 



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