Teknim TFD-4245 Conventional Rate-of-Rise Heat Detector

A conventional heat detector that responds to the rate of temperature rise per unit time rather than absolute temperature value; it is class A2R and performs measurement with two NTCs. For volumes normally cool but with rapidly rising temperatures during fire—such as storage areas, archives, and technical rooms—it provides earlier warning compared to fixed threshold models. Used with the TFA-0120 base; alarm current is 50 mA at 24 V.