SKU: SENS-3634
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Generic KSD9700/BK05-BB1D Metallic Shell Temperature Control Switch - 55C NC, 5A 250V

₹13.00 (Inclusive of all taxes)
Out of Stock

The KSD9700/BK05-BB1D is a metallic-shell, normally closed (NC) thermal switch designed to open at 55°C, protecting circuits and equipment from overheating. It is rated for 5A at 250V AC/DC and is suitable for integration into appliances, power supplies, and industrial control panels.

Features

  • Normally Closed (NC) bimetallic thermal switch opens at 55°C setpoint.
  • Rated for 5A continuous current at 250V AC or DC.
  • Durable metallic shell construction for robust thermal conduction and mechanical protection.
  • Compact design with 7cm lead wires for easy PCB or terminal block connection.
  • Reliable over-temperature protection for motors, transformers, and power electronics.

Out of stock

Description

The KSD9700/BK05-BB1D is a bimetallic disc-type thermal cutoff switch housed in a metallic shell. When the surrounding temperature reaches its calibrated setpoint of 55°C, the internal bimetallic element snaps, mechanically opening the normally closed (NC) contacts to break the circuit. This action provides fail-safe protection against overheating in electrical devices.

Its metallic housing ensures excellent thermal conductivity for accurate temperature sensing and offers superior durability compared to plastic-bodied switches. With a rating of 5A at 250V, it is suited for direct integration into AC or DC power lines within appliances, battery chargers, and industrial control systems, requiring no external power or signal conditioning.

Key Features

  • Precise Thermal Protection: Bimetallic snap-action mechanism provides reliable and repeatable circuit interruption at the 55°C setpoint.
  • Robust Electrical Rating: Handles up to 5A at 250V AC/DC, suitable for direct line-level protection.
  • Durable Metallic Housing: Shell ensures effective heat transfer to the sensing element and provides mechanical strength.
  • Normally Closed Configuration: Circuit is closed under normal temperatures and opens upon overheating, offering fail-safe operation.
  • Compact & Easy to Install: Small form factor with pre-attached 7cm insulated lead wires for straightforward soldering or termination.
  • Maintenance-Free Operation: Single-use, hermetically sealed design; resets automatically upon cooling but is not designed for frequent cycling.

Applications

  • Over-temperature protection in AC/DC power supplies and battery chargers.
  • Thermal safety cutoff for small motors, transformers, and solenoids.
  • Heating element protection in coffee makers, soldering irons, and other small appliances.
  • Temperature monitoring and fault detection in industrial control cabinets and PLC systems.
  • Preventive safety device in LED drivers and power conversion modules.

Technical Specifications

Manufacturer Part NumberKSD9700/BK05-BB1D
TypeBimetallic Thermal Cutoff Switch
Setpoint / Trip Temperature55 °C
Contact ConfigurationNormally Closed (NC)
Rated Voltage250 V AC/DC
Rated Current5 A
Housing MaterialMetallic Shell
Cable Length7 cm (pre-attached leads)
Approx. Dimensions (L x W x H)9 x 7 x 1 cm
Approx. Weight0.03 kg

Frequently Asked Questions

Is this KSD9700 switch normally open or normally closed?

This KSD9700/BK05-BB1D model is a Normally Closed (NC) switch. The contacts are closed at temperatures below its 55°C setpoint, allowing current to flow. When the temperature reaches or exceeds 55°C, the internal bimetallic disc snaps open, breaking the circuit to provide over-temperature protection.

What is the maximum current and voltage rating for this thermal switch?

The switch is rated for a continuous current of 5 Amperes at a maximum voltage of 250 Volts, which can be either AC or DC. It is designed to interrupt this load reliably at its trip temperature. Do not exceed these ratings to ensure safe operation and prevent contact welding or failure.

How do I install and use this temperature control switch?

Install the switch by soldering its two pre-attached 7cm lead wires directly into your circuit, ensuring good thermal contact between its metallic shell and the component or area you wish to monitor. The switch is mechanically self-contained and requires no external power. It will automatically reset once the temperature cools below the setpoint, closing the contacts again.

Can this switch be used for precise temperature control or frequent cycling?

No, this is a protective thermal cutoff switch, not a precision thermostat for control loops. Its bimetallic snap-action provides a clear on/off state at approximately 55°C but has a hysteresis (difference between trip and reset temperatures). It is not designed for frequent on/off cycling and is best used for one-time safety protection or infrequent events.

Package Includes

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

Additional Information

Weight 0.03 kg
Dimensions 9 × 7 × 1 cm