The Fenwal 12-E27121-000-03 is a fixed-temperature, rate-compensated Detect‑A‑Fire thermal switch rated for 160 °F. It’s a vertical‑mount style with a brass head and closes on temperature rise.  The switch is designed to operate reliably even under shock, vibration, and varied ambient conditions and is UL, ULC, FM, and CE certified .

This normally-open SPST device is rated for 5 A at 125 VAC and 0.5 A at 125 VDC. The rate-compensated design ensures it trips precisely at its setpoint, whether temperature rises quickly or slowly. It threads into a junction box via ½‑14 NPT and includes 6-inch leads for easy wiring.

Applications

• Protection of schools, factories, offices, libraries, etc.
• Power generation
• Gas station islands
• Range hoods

Ideal for fire detection and control in commercial and industrial settings, this switch is used in systems such as clean-agent release panels, CO₂ systems, pump panels, paint booths, and engine compartments.  The 12-E27121-000-03 directly replaces part number 12-X27121-000-160.