Temperature Detector

Temperature detectors operate independent from any current supply. Temperature detection is effected by means of a bimetal disc which is dimensioned in accordance with the required cut-off temperature. When this fixed cut-off temperature is reached, the switch opens (type P) or closes (type O) the electric circuit of the device.

After cooling down at reset temperature, the contact system returns to its original position.

Technical Review: Temperature Control and Thermal Protection Solutions by LIMITOR

LIMITOR is a leading provider of temperature control and thermal protection solutions, offering a wide range of products including temperature detectors, thermal switches, current and temperature limiters, and more. These solutions are designed for various industrial applications, including electronics, electric motors, household appliances, heating and cooling systems, and more.

Operating Principle of Bimetal Switches

The products are based on bimetal technology – a dual-metal mechanism that reacts to temperature changes. When the temperature reaches a predefined value, the bimetal disc bends and changes the switch state:

• Type P Switch (Normally Closed – NC): Opens when the temperature exceeds the set value.
• Type O Switch (Normally Open – NO): Closes when the temperature exceeds the set value.
• Self-Holding Temperature Limiters: Once the temperature threshold is exceeded, the switch remains open until manually reset.

Product Overview

1. Thermal Switches for Temperature Detection

• Temperature Switch O – Bimetal thermal switch in NO state, supports up to 1.0A, with an operating range of 50 – 130°C.
• Temperature Switch P – Bimetal thermal switch in NC state, supports up to 4.0A, with an operating range of 40 – 150°C.
• Temperature Limiter Q – Bimetal switch with a self-holding function, supports up to 6.5A, with an operating range of 40 – 150°C.
• Current and Temperature Limiter Y – Bimetal switch with self-holding and tripping functions, supports up to 9.6A, with an operating range of 40 – 150°C.

2. High-Current Thermal Protectors

• Thermal Protector BM-1 Series – High-current bimetal thermal switch supporting up to 20A, with an operating range of 45 – 180°C.
• Thermal Protectors TB02 / TB05 / TB11 – A series of thermal protectors supporting up to 17A, with an operating range of 50 – 165°C.
• High Temperature Protector TB97/98 – High-temperature-resistant switch supporting up to 13A, with an operating range of 180 – 450°C.

3. Bimetal Thermostats

• Bimetal Thermostat KO, KS, KB, SO – Bimetal thermostats for temperature control and limiting, supporting up to 16A, with an operating range of -25 – 350°C.
• Bimetal Thermostat TK24/TK32 Series – Temperature controllers supporting up to 16A.
• Bimetal Thermostat KSD Series – High-current thermostats supporting up to 25A, with an operating range of 0 – 280°C.

4. Motor Protectors

• Motor Protectors ST01 / ST06 – Thermal switches for electric motor protection, supporting up to 10A, with an operating range of 60 – 180°C.

Key Applications

• Automotive Industry – Protecting electrical components from overheating.
• Household Appliances – Protecting water heaters, coffee machines, electric kettles, and more.
• Heating and Cooling Systems – Temperature control in air conditioners, heaters, and ovens.
• Medical Industry – Ensuring stable temperatures in sensitive equipment.
• Electric Motors – Preventing overheating in industrial and heavy-duty motors.

Conclusion

LIMITOR products provide advanced and reliable solutions for temperature monitoring and control in a wide range of industries. The differences between the various models allow for optimal adaptation to each application while ensuring high performance and long-term reliability. AMIRONIC is the exclusive representative of LIMITOR in Israel, offering professional consultation and customized temperature control solutions for its customers.