Thermostat KSD9700

Thermostat KSD9700 20x7.5mm, Metal or Plastic
Thermostat KSD9700A 15.5x7.2mm, Metal or Plastic

Thermostat KSD9700 series products are thermostats that use bimetallic discs as temperature sensing elements. When the appliance is working normally, the bimetallic discs are in a free state and the contacts are in a closed/ open state. When the temperature rises to the action temperature value, the bimetallic element is heated to generate internal stress and quickly moves, opening/ closing the contacts, cutting off/ connecting the circuit, thereby playing a thermal protection role. When the temperature drops to the reset temperature, the contacts automatically close/ open and resume normal working state. It is widely used in household appliances and electrical equipment, such as washing machine motors, air conditioner fan motors, transformers, ballasts, electric heating appliances, etc.

AC250V50~60Hz.5A or 8A (resistant load)
0peration temperature: x士5℃
Reset temperature: <30 ℃ from operation temperature
Normal electrical strength: ACl450V 50~60Hz,No breakdown or no flashover occurred for l min.
Normal insulation resistance: more than 100MQ(DC500 megohmmeter)
Contact resistance:<50mΩ (length of lead X according to customer needs)
Heat resistance: The installation surface temperature does not exceed 120% of the operating temperature
Contact form: single pole single throw
Contact type: normally close
Structure: built-in
Service life: AC250V 5A or 8A (resistive load)10.000 times

Thermostat KSD9700 metal case

Thermostat KSD9700 plastic case

Thermostat KSD9700A plastic case

Thermostat KSD9700A metal case

KSD9700 Thermostat Selection Guide

1. Temperature Range Configuration

Operating Span: Select from calibrated ranges per IEC 60730-2-9:

Standard: 0°C to 250°C (5°C increments)

Extended: -30°C to 300°C (industrial-grade models)

Critical Applications: For medical/process control, specify ±1°C tolerance (Class 1 per EN 14597).

2. Electrical Load Capacity

Contact Ratings:

Resistive Loads: 16A@250V AC (cosφ=1)

Inductive Loads: 10A@400V AC (cosφ≥0.6, 20ms arc suppression required)

Derating Curve: Apply 15% current reduction for ambient >40°C (per UL 60730 derating tables).

3. Contact Configuration

Circuit Types:

SPDT (Form C): For safety interlock systems (e.g., HVAC dual-circuit control)

NC/NO Selection:

NC: Default for over-temperature cutoff (trip at T_max)

NO: For under-temperature alarms (activate at T_min)

Contact Material: AgCdO (anti-welding grade) with ≤35mΩ initial resistance (IEC 60664-1).

4. Mechanical Integration

Mounting Options:

DIN Rail: TS35 compliant with IP20 enclosures

Direct Mount: M4 screw fixation (2.5Nm torque limit)

Probe Types:

Immersion: 316L stainless steel, 15/30mm stem (EN 10088-1 compliant)

Surface: Spring-loaded clamp (2.5N pressure min.)

5. Precision Control Parameters

Hysteresis Adjustment:

Fixed Differential: 3K±0.5K (default)

Adjustable: 2-10K via calibration screw (requires ISO 17025-certified calibration)

Response Time: ≤100ms snap-action mechanism (VDE 0660 tested).

6. Environmental Compliance

IP Rating: IP67 (submersible models) with silicone-sealed terminals

Operating Limits:

Humidity: 0-95% RH (non-condensing)

Vibration: 10-150Hz @ 2g (MIL-STD-810G Method 514.6)

Chemical Resistance: Passes 500h salt spray (ASTM B117) and UL 746C fluid exposure tests.

7. Certification & Validation

Mandatory: UL 60730-1, EN 60335-1 (Annex R)

Sector-Specific:

Medical: IEC 60601-1 leakage current <0.1mA

Automotive: TS 16949 process controls

Lifetime Testing: 100,000 cycles @ 16A resistive load (IEC 61058-1).

8. Application-Specific Guidelines

Application Model Variant Critical Settings Validation Protocol

Commercial Ovens KSD9700-250C 230°C ±2°C, 12A inductive 24h thermal shock (-30→250°C)

Solar Thermal Systems KSD9700-150WP 140°C cutoff, IP68, 25A surge UL 1741 reverse current test

CNC Machine Cooling KSD9700-40I 4-40°C range, 304SS probe EN 50304 eddy current inspection

Post-Installation Checks:

Perform dielectric test: 2.5kV AC between live parts (IEC 61180-1)

Validate contact resistance: ≤100mΩ after 1,000 cycles (4-wire Kelvin method)

For batch installations: 10% sample testing per AQL 1.0 (ISO 2859-1).

Failure Avoidance:

Arcing Issues: Add RC snubber (0.1μF + 100Ω) for inductive loads >5A

False Tripping: Maintain 15mm clearance from heat sources (NFPA 70 Art. 424)

Calibration Drift: Annual recalibration via dead-weight tester (ASME PTC 19.3).

By carefully considering these factors, you can select the right thermostat such as the KSD9700 that meets the specific needs of your application in terms of temperature control and electrical switching capabilities.

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