Thermostats TH 220, TH 221
Description
Thermostat consists of a stem and a switch head. Temperature-sensitive element is formed by brass tube of the stem. Temperature-depending dilatation of the tube is transferred by invar rod to switch mechanism. The switch mechanism is snap-action single-pole switch. Switch mechanism is closed in thermostat head. Temperature scale is marked directly on the regulation knob.
The thermostat can be mounted with screws using two holes at its base plate. Avoid mechanical stress of stem during installation. When used in vibrating equipment, attach the free end of the stem (but do not restrict the dilatation) and fix the set temperature by tightening of the locking screw. Contact are bridged by capacitors for switching of the DC current.
Advantages
- high sensitivity
- resistance to humid and dusty environment
Technical data
| Control range | -20 °C to +60 °C |
| Switching difference | 1-3 K |
| Setting accuracy | ±5 % from the highest rated switching temperature |
| Rated voltage, rated current | 60V, 1A DC; 120V, 0,5 A DC (TH 220) 250V, 15A AC (TH 221) |
| Stem length | 560 mm |
| Weight | approx. 0,8 kg |
| Protection | IP 44 |
| Resistance to external influences | head resistant to influences of class AB7, AE3, AM1, AN1, BE1 |
| Max. temperature of the switch head | 120 °C |
| Max. temperature of the stem | 140 °C |
| Lifetime | 10 000 cycles |
Dimensional drawings
Photos of the product
