Temperature Limiters - Technical Details

Contact Rating : 230 V, 20 Amps.
Insulation Level : 1.0 KV for 1 minute.
Preset Temperatures available : 85ºC, 90ºC and 95ºC.
Tolerance on preset temperature : ± 3ºC
Contact configuration : Opening on temperature rise



Contact us for Temperature Limiter with other specifications and preset temperatures.

PRINCIPLE OF OPERATION

Differential linear thermal expansion available from a combination of stem of brass tube (high thermal expansion alloy) and nickel-iron wire (very low thermal expansion alloy) is used to operate a high-precision micro-gap switch. Switch contacts open when temperature of brass stem exceeds the set temperature & remain open till manually reset after stem temperature drops down to safe limits.

As the mechanism is operated by linear thermal expansion, tolerance on operating temperature improve with increase in stem length.

CONSTRUCTION

Switch is provided with heavy-duty silver cadmium oxide contacts. Contact spring is made of Beryllium Copper & scientifically heat-treated. Steatite component is used for insulation between stem & live terminals. Extra large brass terminal pillars are used for cool operation Switch base is made of high quality electrical grade material. Brass tube and nickel-iron wire are brazed together using silver alloy. 

APPLICATION

These are designed for use in electric water heaters & geysers, water baths, oil baths and similar other applications where temperature need to be limited automatically to safe limits. 

Note: Manufacturer reserves the right to modify specifications, design & materials of the product without notice.