SKU: SENS-3628
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Generic KSD9700/BK05-BB1D Metallic Shell Temperature Control Switch - 70°C NC, 5A 250V

₹45.00 (Inclusive of all taxes)
Out of Stock

The KSD9700/BK05-BB1D is a metallic-shell, snap-action thermal switch designed for over-temperature protection in electrical circuits. It features a normally closed (NC) contact that opens at a calibrated 70°C set point, rated for 5A at 250V AC/DC loads, ensuring reliable safety cutoff in appliances and power equipment.

Features

  • 70°C Normally Closed (NC) snap-action thermal switch with precise bimetal actuator.
  • Rated for 5A at 250V AC/DC, suitable for controlling heaters, motors, and transformers.
  • Robust metallic shell construction for mechanical durability and effective thermal conduction.
  • Compact form factor with integrated 7cm lead wires for straightforward screw-terminal connection.
  • Ideal for over-temperature protection in appliances, power supplies, and industrial control panels.

Out of stock

Description

The KSD9700/BK05-BB1D thermal control switch utilizes a bimetallic disc mechanism housed within a metallic shell. When the ambient temperature reaches the factory-calibrated set point of 70°C, the disc snaps and mechanically opens the normally closed (NC) electrical contacts, breaking the circuit to prevent overheating. This fail-safe action is instantaneous and resets automatically once the temperature drops below the set point.

Designed for direct integration into mains-voltage circuits, its 5A 250V rating makes it suitable for protecting motors, transformers, heating elements, and lighting ballasts. The metallic shell ensures rapid thermal response and provides EMI shielding and physical robustness for demanding industrial or appliance environments. The included 7cm insulated lead wires facilitate secure connections to terminal blocks or solder points.

Key Features

  • Precision bimetallic snap-disc actuator for reliable, repeatable temperature switching at 70°C.
  • Heavy-duty electrical rating: 5A continuous current at 250V AC or DC.
  • Durable metallic housing ensures excellent heat transfer and long-term mechanical stability.
  • Normally Closed (NC) contact configuration provides fail-safe circuit interruption on temperature rise.
  • Compact design with pre-attached wiring for simplified installation in space-constrained applications.
  • Wide compatibility with common control voltages and typical appliance safety standards.

Applications

  • Over-temperature cut-off safety switch in coffee makers, rice cookers, and small kitchen appliances.
  • Thermal protection for transformers, solenoids, and low-power motor windings in industrial control cabinets.
  • Safety interlock in LED drivers, power supply units, and battery chargers to prevent thermal runaway.
  • Temperature monitoring and cutoff in incubators, terrarium heaters, and agricultural warming equipment.
  • Embedded thermal safety device in 3D printer heated beds, hot ends, and enclosure temperature control.

Technical Specifications

Manufacturer Part NumberKSD9700/BK05-BB1D
Switch TypeThermal Protector, Snap-Action
Contact ConfigurationNormally Closed (NC)
Set Point / Trip Temperature70°C
Rated Voltage250V AC/DC
Rated Current5A
Housing MaterialMetallic Shell
Cable Length7 cm (pre-attached)
Head Dimensions (approx.)2 x 0.8 x 0.2 mm (actuator)
Reset TypeAutomatic (on temperature drop)

Frequently Asked Questions

What is the reset behavior of this KSD9700 thermal switch?

The KSD9700/BK05-BB1D features an automatic reset mechanism. Once the temperature at the sensing head drops approximately 10-15°C below the 70°C trip point, the bimetallic disc cools and snaps back, re-closing the normally closed (NC) contacts to restore circuit continuity. This cycle repeats without manual intervention.

Can this switch be used to control a 120V AC heater?

Yes, this thermal switch is rated for 250V AC/DC and 5A, making it suitable for 120V AC applications. The 5A rating applies up to the maximum 250V. Ensure the inrush and steady-state current of your heater does not exceed 5A. The normally closed configuration is ideal for series connection in the hot line to interrupt power on over-temperature.

How should I mount the thermal switch for accurate temperature sensing?

For optimal performance, mount the metallic shell of the switch in direct physical contact with the surface or component you need to monitor, using thermal paste or a clamp to ensure good heat transfer. The bimetal disc inside responds to the temperature of its housing. Avoid placing it in direct airflow or isolated from the heat source, as this will delay or prevent accurate tripping.

What is the electrical connection method for this switch?

The switch comes with two pre-attached 7cm insulated lead wires. You can connect these wires directly to screw terminals, solder them to a PCB, or use crimp connectors. Polarity does not matter for the AC operation of the switch contacts. Ensure connections are secure and insulated to prevent short circuits or arcing at the rated 5A current.

Package Includes

  • 1 x KSD9700/BK05-BB1D Metallic Shell Temperature Control Switch (70°C NC)

Additional Information

Weight 0.03 kg
Dimensions 9 × 7 × 1 cm