SKU: SENS-3650
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KSD9700/BK05-BB1D Metallic Shell Temperature Control Switch - 155C NC, 5A 250V

₹15.00 (Inclusive of all taxes)
Out of Stock

The KSD9700/BK05-BB1D is a metallic shell, snap-action thermal switch rated for 5A at 250V AC/DC, designed to open a circuit at its calibrated 155°C setpoint. This normally closed (NC) thermal protector is suitable for integration into power supplies, motor controls, and industrial equipment for over-temperature cutoff protection.

Features

  • Metallic shell construction for robust thermal conduction and durability.
  • Normally closed (NC) contact opens at the calibrated 155°C (±5°C) setpoint.
  • Rated for 5A switching current at up to 250V AC or DC.
  • Compact form factor with 7cm lead wires for easy installation.
  • Reliable snap-action bimetallic disc mechanism for precise trip and reset.

Out of stock

Description

The KSD9700 series thermal switch utilizes a bimetallic disc mechanism housed within a metallic shell for efficient heat transfer and reliable operation. When the ambient temperature reaches the factory-calibrated setpoint of 155°C, the disc snaps, mechanically opening the normally closed electrical contacts to interrupt the circuit, providing fail-safe thermal protection.

Designed for direct mounting on heat sinks, motor housings, or within enclosures, this switch offers a simple, non-powered solution for over-temperature cutoff. Its robust metallic housing ensures consistent thermal response and mechanical strength in demanding environments, making it a staple component in appliance safety, power electronics, and industrial control panels.

Key Features

  • Metallic shell ensures excellent thermal conductivity and physical robustness.
  • Precision bimetallic snap-action mechanism for reliable trip and reset hysteresis.
  • Rated for 5 Amps at 250V, suitable for direct control of small motors, heaters, or transformers.
  • Normally Closed (NC) configuration provides fail-safe open-circuit upon over-temperature.
  • Factory-set trip temperature of 155°C with typical tolerance of ±5°C.
  • Includes 7cm insulated lead wires for straightforward solderless connection.
  • Compact dimensions (approx. 9 x 7 x 1 cm) allow for flexible mounting.
  • Maintenance-free operation with a long mechanical lifespan.

Applications

  • Over-temperature cutoff in power supplies, transformers, and battery chargers.
  • Thermal protection for AC/DC motors, fans, and pumps in appliances.
  • Safety interlock in industrial control panels and heating equipment.
  • Temperature monitoring in 3D printer hotends and CNC machine components.
  • Preventive protection for audio amplifiers and power electronics heat sinks.

Technical Specifications

Manufacturer Part NumberKSD9700/BK05-BB1D
Switch TypeThermal Protector, Normally Closed (NC)
Rated Voltage250V AC/DC
Rated Current5A
Trip Temperature155°C
Contact ConfigurationSPST-NC (Single Pole, Single Throw - Normally Closed)
Housing MaterialMetallic Shell
Lead Wire Length7 cm
Operating PrincipleBimetallic Snap Disc
Reset TypeAutomatic upon cooling below reset temperature

Frequently Asked Questions

What is the trip temperature and tolerance for this thermal switch?

The KSD9700/BK05-BB1D is factory-calibrated to trip (open the circuit) at 155°C. The typical tolerance for this type of bimetallic snap-action switch is ±5°C. It will automatically reset and close the circuit once the temperature cools sufficiently below the trip point, usually by about 10-20°C.

Can this switch handle 5A at 250V AC and DC?

Yes, the switch is rated for 5 Amps at up to 250 Volts, for both AC and DC loads. This rating applies to resistive loads; for inductive loads like motors or solenoids, derating may be necessary to account for inrush currents and arcing. It is designed to directly interrupt power to small devices without requiring a separate relay.

How should I mount and wire the KSD9700 thermal switch?

For optimal thermal response, mount the metallic shell of the switch directly to the component or heat sink you wish to monitor, using thermal paste to improve conduction. The 7cm insulated lead wires can be connected directly to your circuit; one wire is connected to the load, the other to the power source, forming a series connection in the normally closed state.

Package Includes

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

Additional Information

Weight 0.03 kg
Dimensions 9 × 7 × 1 cm