SKU: SENS-3606
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Generic KSD301 135°C NC Thermostat Switch - Bakelite Housing, 250V 10A

₹11.00 (Inclusive of all taxes)
Out of Stock

The Generic KSD301 is a normally closed (NC) snap-action thermostat switch rated for 250V AC/DC and 10A, featuring a fixed 135°C (275°F) activation temperature. Its bakelite housing provides electrical insulation and thermal stability for integration into heating control circuits, appliance safety cut-offs, and industrial temperature protection systems.

Features

  • Fixed 135°C (275°F) normally closed (NC) snap-action bimetallic thermostat
  • Rated for 250V AC/DC and 10A switching capacity
  • Bakelite housing for high electrical insulation and thermal resistance
  • Compact and robust design for appliance safety and industrial control
  • Simple two-wire installation for series connection in heating circuits

Out of stock

Description

The KSD301 is a bimetallic disc-type thermostat that operates on a snap-action mechanism. When the ambient temperature reaches its calibrated set point of 135°C, the bimetallic disc deforms, causing the normally closed (NC) contacts to snap open, breaking the circuit. This provides a reliable, non-resettable (unless manually cooled) over-temperature cut-off function.

Encased in a durable bakelite shell, the switch offers excellent dielectric strength and resistance to tracking, making it suitable for direct integration into mains-powered heating elements, motors, transformers, and other equipment requiring thermal protection. Its simple two-terminal design allows for straightforward series wiring within the load circuit.

Key Features

  • Bimetallic snap-action mechanism for precise, repeatable switching at 135°C
  • High-current 10A rating for direct control of significant heating loads
  • Bakelite enclosure ensures high-voltage insulation (250V) and flame retardancy
  • Normally closed (NC) configuration fails safe, opening on over-temperature
  • Compact and mechanically robust construction for long service life
  • Designed for surface mounting with integrated bracket for secure installation
  • Wide operating temperature range suitable for demanding industrial environments
  • High-value build for cost-effective thermal protection solutions

Applications

  • Over-temperature safety cut-off in electric water heaters, coffee makers, and kettles
  • Thermal protection for motors, transformers, and power supplies in industrial control panels
  • Safety interlock in soldering stations, 3D printer heated beds, and laboratory equipment
  • Temperature limiting in HVAC systems, fan controllers, and space heaters
  • Appliance compliance with thermal safety standards (UL, CE)

Technical Specifications

Model NumberKSD301
Switch TypeNormally Closed (NC), Snap-Action
Actuation Temperature135°C (275°F)
Rated Voltage250V AC/DC
Rated Current10A
Housing MaterialBakelite (Phenolic Resin)
Contact ConfigurationSPST (Single-Pole, Single-Throw)
Terminal TypeQuick-Connect / Spade (0.250")
MountingBracket Mount
Approx. Weight3 g

Frequently Asked Questions

What is the switching logic of this KSD301 thermostat?

This KSD301 model is a Normally Closed (NC) switch. The contacts are closed at temperatures below its 135°C set point, allowing current to flow. When the sensed temperature reaches 135°C, the internal bimetallic disc snaps and opens the contacts, breaking the circuit to provide over-temperature protection.

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

The switch is rated for 250 Volts (AC or DC) and a maximum current of 10 Amps. Do not exceed these ratings. It is designed for direct switching of resistive loads like heating elements. For inductive loads (motors, solenoids), derating or using an external relay is recommended to handle inrush currents.

How do I mount and wire this thermostat?

Mount the thermostat using its integrated metal bracket, ensuring good thermal contact with the surface or component you wish to monitor. Connect the two quick-connect terminals in series with the load (e.g., the heating element) and the power source. The switch is non-polarized, so either terminal can be used for line or load.

Is this thermostat resettable, and what is its hysteresis?

Yes, it is automatically resettable. After tripping at 135°C, the contacts will close again once the temperature cools below the reset point, which is typically 5-15°C lower than the trip temperature (hysteresis). This cycle repeats, providing continuous protection without manual intervention.

Package Includes

  • 1 x KSD301 135°C NC Thermostat Switch

Additional Information

Weight 0.02 kg
Dimensions 9 × 6 × 2 cm