KSD301B Defrost Thermostat

The KSD301B is a bimetal defrost thermostat built for precise temperature control in refrigeration, HVAC, and heating systems. It uses snap‑action bimetal discs to trigger defrost cycles, prevent frost buildup, and protect equipment from overheating.

Key Features

1. Precision temperature regulation for stable defrost operation

2. Fast response with reliable snap‑action switching

3. Compact size for installation in confined spaces

4. Robust build rated up to 100,000 mechanical cycles

5. Available in normally open / normally closed and auto‑reset / manual‑reset versions

Technical Specifications

1. Temperature range: 0°C – 250°C

2. Electrical rating: 10A / 16A 250VAC

3. Temperature tolerance: ±3°C to ±5°C

4. Contact type: NC / NO

5. Reset type: Automatic / Manual

6. Mechanical life: 100,000 cycles

How It Works

KSD301B uses a bimetallic disc composed of two metals with different expansion rates. When temperature reaches the preset threshold, the disc snaps to open or close contacts, starting or stopping the defrost cycle. This fast, repeatable action ensures accurate temperature control and system safety.

Typical Applications

1. Refrigerators and freezers

2. Air conditioners and heat pumps

3. Industrial heating equipment

4. Automotive climate control and defrost systems

Core Benefits

1. Improves energy efficiency by activating defrost only when needed

2. Extends equipment life and reduces maintenance

3. Delivers consistent, repeatable performance in harsh environments

4. Supports flexible design and easy integration

Selection Guide

Choose based on three key requirements:

1. Target temperature range for your device

2. Electrical load (10A or 16A)

3. Reset type: automatic for general use, manual for safety‑critical systems

FAQ

What does KSD301B do?

It controls defrost cycles to prevent frost and overheating in cooling and heating systems.

How long does KSD301B last?

Up to 100,000 switching cycles under normal operating conditions.

Can I use KSD301B in freezers?

Yes, it is widely used in household and commercial freezers for defrost control.