SKU: SENS-3611
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KSD301 110°C Normally Open NC Temperature Control Switch Thermostat - Bakelite, 250V 10A

₹11.00 (Inclusive of all taxes)
Out of Stock

The KSD301 is a bimetallic, normally-open (NO) snap-action thermostat rated for 250V AC/DC and 10A, designed to open its contacts at a fixed 110°C set point. This Bakelite-housed switch is ideal for over-temperature protection and simple temperature control in appliances, power supplies, and industrial equipment.

Features

  • Fixed 110°C (230°F) snap-action bimetallic disc actuator
  • Normally Open (NO) contact configuration; opens on temperature rise
  • High current rating: 10A at 250V AC/DC for direct load switching
  • Durable Bakelite housing with UL94-V0 flame-retardant properties
  • Compact, screw-terminal design for easy integration into control panels

Out of stock

Description

The KSD301 is a mechanical, fixed-temperature thermostat utilizing a bimetallic disc as its sensing element. As the ambient temperature reaches the calibrated 110°C set point, the disc snaps, physically opening the normally closed contacts to break the circuit. This provides a reliable, non-resettable cut-off for overheating protection without requiring external power.

Housed in a robust Bakelite case, the switch offers excellent electrical insulation and thermal stability. The screw terminals facilitate secure wiring for direct integration into AC or DC control loops, making it suitable for safeguarding heaters, motors, transformers, and small appliances from thermal runaway.

Key Features

  • Fixed-Temperature Protection: Precisely calibrated bimetallic disc opens contacts at 110°C (±5°C typical tolerance).
  • High-Current Switching: Handles up to 10A resistive load at 250V AC/DC for direct control of heating elements or fans.
  • Robust Insulation: Bakelite housing provides high dielectric strength and resistance to tracking, suitable for mains voltage applications.
  • Snap-Action Mechanism: Ensures quick, positive contact separation to minimize arcing and extend switch life.
  • Normally Open Configuration: Circuit is open at temperatures below the set point; opens fully upon reaching trip temperature.
  • Compact & Mountable: Small footprint with mounting holes for secure installation on heatsinks or inside enclosures.

Applications

  • Over-temperature cut-off protection for electric water heaters, coffee makers, and small appliances.
  • Thermal safety switch in power supplies, battery chargers, and transformer enclosures.
  • Temperature limiting control for 3D printer heated beds, extruder heaters, or CNC machine spindles.
  • Fan control or alarm triggering in electronic equipment racks and ventilation systems.
  • Simple thermostat function in incubators, soldering stations, or laboratory heating devices.

Technical Specifications

Model / TypeKSD301 Temperature Control Switch
Switch ConfigurationNormally Open (NO)
Set Point (Trip Temperature)110 °C
Rated Voltage250V AC/DC
Rated Current10A
Contact MaterialSilver Alloy
Housing MaterialBakelite (Phenolic Resin)
Actuator TypeBimetallic Disc (Snap-Action)
Terminal TypeScrew Terminals
Approximate Weight3 g

Frequently Asked Questions

What is the trip temperature and reset behavior of the KSD301 switch?

The KSD301 is a fixed-set, automatic reset thermostat. Its bimetallic disc is calibrated to snap and open the normally open contacts at 110°C. Once the ambient temperature cools down approximately 15-25°C below the set point, the disc will snap back, resetting the switch automatically for the next cycle.

Can this switch be used to directly control a 120V AC heating element?

Yes. With a rating of 10A at 250V AC, the KSD301 is suitable for directly switching 120V AC loads, including heating elements, provided the current draw does not exceed 10A. Ensure wiring is secure using the screw terminals and that the switch is mounted in a location where it can accurately sense the temperature of the protected device.

How do I wire this normally open (NO) thermostat?

Wire the KSD301 in series with the load (e.g., heater) and the power source. In its normal state below 110°C, the circuit is open and no current flows. When temperature rises to the trip point, the contacts remain open. Therefore, it is typically used as a safety cut-off: when it opens at high temperature, it breaks the circuit to turn the load OFF.

What is the electrical life expectancy of the contacts?

The silver-alloy contacts are designed for frequent snap-action operation. Under rated resistive load (10A, 250V), expect a mechanical life of over 100,000 cycles. Life can be reduced with inductive or capacitive loads due to arcing. For best longevity, use within the specified current and voltage ratings and consider a snubber circuit for inductive loads.

Package Includes

  • 1 x KSD301 110°C Normally Open Temperature Control Switch

Additional Information

Weight 0.02 kg
Dimensions 9 × 6 × 2 cm