FTR series temperature controllers Thermostats to protect against freezing, in a plastic housing for use in damp environments. The FTR-E3121 is an electro-mechanical frost monitor, whereas the FTR 1207 is an electronic thermostat with indoor and outdoor settings. Settings on front panel Cable entry via PG13 cable gland. FTR-E 3121 FTR 1207 Voltage: 230 VAC 230 VAC Temperature range: -20 °C → +35 °C 0 → 40 °C Hysteresis: 3 °K 1.5 °K Contact: 1 C/O 10 (4) A 1 C/O 116 (4) A Protection index: IP 65 IP 54