Thermotech 302-ET-135 — hermetically sealed rate compensation heat detector rated 135°F, with a hexagonal grip bushing and 1/2" conduit threads.
Rate compensation sits between fixed temperature and rate of rise. A high-expansion aluminium shell encases two slower struts carrying opposing contacts, so on a rapid rise the shell lengthens first and the contacts close sooner, cancelling the thermal lag of a conventional fixed head.
- Normally open and self-restoring: contacts reopen once ambient drops below rating
- Contact rating 6–125 VAC at 5 A, 6–25 VDC at 1 A, 125 VDC at 0.5 A
- Maximum ceiling temperature 100°F at this rating
- UL smooth-ceiling spacing 50 × 50 ft on 8 to 10 ft ceilings
- Non-ferrous, shock and corrosion resistant, tamper proof; keep out of direct sunlight
- UL Listed, FM Approved, CSFM 7270-0021:001, NYC MEA 193-03-E
The 302-ET-194 is the 194°F version of the same body. The 302-AW-135 is the same sealed detector without the conduit bushing, the plain 302-135 is the interior screw-terminal model, and the 302-EPM-135 is explosion proof.
