SKU: SENS-3632
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Generic KSD9700/BK05-BB1D 5A 250V Metallic Shell Temperature Control Switch (60C Normally Closed)

₹45.00 (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, featuring a normally closed (NC) contact that opens at a fixed 60°C setpoint. This compact, durable protector is designed for integration into electrical appliances, power supplies, and industrial control panels to provide reliable over-temperature cutoff.

Features

  • Fixed 60°C (140°F) normally closed (NC) snap-action bimetallic switch.
  • Rated for 5A resistive load at 250V AC/DC for reliable circuit interruption.
  • Rugged metallic housing ensures mechanical durability and good thermal conductivity.
  • Compact dimensions (approx. 9 x 7 x 1 cm) for easy integration into tight spaces.
  • Pre-wired with 7cm lead wires for simplified installation and connection.

Out of stock

Description

The KSD9700/BK05-BB1D is a bimetallic disc-type thermal protector housed in a robust metallic shell. Its operating principle relies on the differential thermal expansion of a bimetallic element, which snaps to physically open the electrical contacts once the calibrated temperature threshold (60°C) is reached, thereby breaking the circuit to prevent overheating. The switch remains open until the temperature cools below the reset point, typically a few degrees lower than the trip point.

Designed for direct mounting on heat sinks, motor housings, or within transformer enclosures, its metal casing ensures fast thermal response and long-term reliability in demanding environments. The normally closed configuration makes it ideal for series connection in a power line, where an over-temperature event will safely de-energize the protected device or subsystem.

Key Features

  • Fixed Temperature Protection: Precisely calibrated bimetallic disc trips at 60°C (±5°C typical tolerance) to open the circuit.
  • High-Current Switching: Handles up to 5 Amps at 250V AC/DC, suitable for controlling small motors, heaters, and transformers directly.
  • Robust Metallic Housing: Provides excellent mechanical strength, corrosion resistance, and efficient heat transfer to the sensing element.
  • Normally Closed (NC) Operation: Circuit is closed under normal conditions; opens upon overheating for fail-safe protection.
  • Manual Reset: Automatically resets once the temperature cools sufficiently below the trip point, restoring circuit continuity.
  • Pre-attached Wiring: Includes 7cm insulated lead wires for quick solderless or terminal block connections.
  • Compact & Lightweight: Minimal footprint and low weight (approx. 30g) for versatile installation in appliances and control panels.

Applications

  • Over-temperature protection in small power supplies, battery chargers, and LED drivers.
  • Thermal cutoff safety for electric motors, solenoids, and fan coils in appliances.
  • Embedded thermal protection within transformer enclosures and power conversion modules.
  • Safety interlock for heating elements in coffee makers, soldering irons, and food warmers.
  • Preventive thermal management in telecommunications equipment and industrial control cabinets.

Technical Specifications

Manufacturer Part NumberKSD9700/BK05-BB1D
Switch TypeBimetallic Thermal Protector (Snap-Action)
Contact ConfigurationNormally Closed (NC)
Trip Temperature60°C
Rated Voltage250V AC/DC
Rated Current5A (Resistive Load)
Housing MaterialMetallic Shell
Lead Wire Length7 cm
Approx. Dimensions (L x W x H)9 cm x 7 cm x 1 cm
Approx. Weight0.03 kg

Frequently Asked Questions

What is the trip temperature and reset behavior of this thermal switch?

This KSD9700 switch has a fixed trip temperature of 60°C (140°F) with a typical tolerance of ±5°C. It is a normally closed (NC) bimetallic snap-action switch, meaning the contacts open at 60°C to break the circuit. It will automatically reset and close the contacts once the temperature cools sufficiently below the trip point, usually by 10-20°C, restoring power automatically.

What is the maximum electrical load I can control with this switch?

The switch is rated for a maximum of 5 Amps at 250 Volts AC or DC, assuming a resistive load. This rating is suitable for directly switching small motors, heating elements, or transformers. For inductive or capacitive loads, derating or additional snubber circuits may be required for long-term reliability and to prevent contact arcing.

How should I mount and install this metallic shell thermal switch?

For accurate temperature sensing, the metallic housing should be in direct physical contact with the heat source (e.g., a motor casing, transformer core, or heat sink) using thermal paste or a mounting clip. The 7cm pre-attached wires can be connected via solder, screw terminals, or quick connectors. Ensure the switch is not insulated from the monitored surface to guarantee proper thermal response.

Package Includes

  • 1 x KSD9700/BK05-BB1D Metallic Shell Temperature Control Switch (60C NC)

Additional Information

Weight 0.03 kg
Dimensions 9 × 7 × 1 cm