SKU: SENS-3641
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KSD9700/BK05-BB1D Metallic Shell Temperature Control Switch - 35°C Normally Open, 5A 250V

₹104.00 (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 AC circuits up to 250V. It features a normally open (NO) contact configuration that closes upon reaching its 35°C setpoint, making it suitable for safeguarding appliances, power supplies, and industrial equipment.

Features

  • Metallic shell construction for robust thermal conduction and durability.
  • Normally Open (NO) contact configuration activates at 35°C setpoint.
  • Rated for 5A at 250V AC, suitable for direct line-level protection.
  • Snap-action bimetallic disc mechanism ensures reliable and quick switching.
  • Compact design with integrated 7cm lead wires for easy installation.

Out of stock

Description

The KSD9700/BK05-BB1D is a bimetallic thermal cutoff switch housed in a metallic shell for efficient heat transfer and mechanical strength. Its core mechanism utilizes a calibrated bimetallic disc that snaps at a precise temperature (35°C), changing the state of its electrical contacts from open to closed. This action can be used to trigger alarms, cut power, or activate cooling systems.

Engineered for reliability in AC line-voltage applications, this switch provides a simple, cost-effective, and maintenance-free solution for over-temperature protection. Its robust construction ensures stable performance across its operational lifespan, making it ideal for integration into space-constrained designs where component overheating is a critical safety concern.

Key Features

  • Metallic housing ensures excellent thermal conductivity and physical durability.
  • Precision-calibrated bimetallic snap disc for accurate 35°C (±3°C typical) actuation.
  • Normally Open (NO) contact design; circuit completes upon temperature rise.
  • High-current capacity: 5 Amperes at 250 Volts AC for direct load switching.
  • Snap-action mechanism provides positive contact operation and high repeatability.
  • Compact form factor (approx. 9 x 7 x 1 cm) with pre-attached 7cm wire leads.
  • Maintenance-free operation with no requirement for external power or calibration.
  • Optimized performance-to-cost ratio for high-volume safety applications.

Applications

  • Over-temperature cut-off protection in AC/DC power adapters and chargers.
  • Thermal safety switching in small appliances like coffee makers, soldering irons, and hair dryers.
  • Temperature-based fan control or alarm activation in electronic enclosures and control cabinets.
  • Battery pack and power tool thermal management and protection circuits.
  • Preventive safety device in transformers, solenoids, and motor windings.

Technical Specifications

Manufacturer Part NumberKSD9700/BK05-BB1D
Switch TypeThermal Control Switch (Thermostat)
Contact ConfigurationNormally Open (NO)
Actuation (Setpoint) Temperature35°C
Rated Voltage250V AC
Rated Current5A
Housing MaterialMetallic Shell
Actuation MechanismBimetallic Snap Disc
Cable Length7 cm (integrated leads)
Head Dimensions2 x 0.8 x 0.2 mm (Sensor Tip)
Product Weight0.03 kg

Frequently Asked Questions

What is the contact state of this thermal switch at room temperature?

This is a Normally Open (NO) switch. At room temperature (below 35°C), the electrical contacts are open, and no current flows through the switch. When the sensing tip reaches the 35°C setpoint, the internal bimetallic disc snaps, closing the contacts to complete the circuit.

What is the maximum electrical load this switch can handle directly?

The KSD9700/BK05-BB1D is rated for a maximum of 5 Amperes at 250 Volts Alternating Current (AC). It is designed to switch this load directly without an external relay. Do not exceed these ratings, and ensure the load (resistive) matches the switch's specifications for safe operation.

How do I install and mount this temperature control switch?

Installation requires good thermal contact between the metallic sensing tip (2 x 0.8 x 0.2 mm) and the component or surface you wish to monitor. Secure it using thermal adhesive, a clip, or a bracket. The integrated 7cm wire leads are for electrical connection. Ensure the switch is not subjected to mechanical stress that could affect its calibration.

Does this switch reset automatically after it cools down?

Yes, it features an automatic reset function. Once the temperature at the sensing tip falls below the reset point (typically a few degrees below the 35°C actuation point), the bimetallic disc will snap back to its original position, reopening the contacts and breaking the circuit until the temperature rises again.

Package Includes

  • 1 x KSD9700/BK05-BB1D Metallic Shell Temperature Control Switch

Additional Information

Weight 0.03 kg
Dimensions 9 × 7 × 1 cm