Šta je normalno otvoreno (NO) Termostatski prekidač KSD301?

Prekidač termostata KSD301 bimetalni disk radi u normalno otvorenom (NO) konfiguraciju. To znači da je kolo u početku otvoreno (isključen) na normalnim temperaturama. Kada temperatura poraste na unapred definisani prag, bimetalni disk se savija, zatvaranje strujnog kola i omogućavanje protoka struje.

Normally open THERM-O-DISC T-O-D THERMAL LIMIT SWITCH L160-40F 60TX01

UL/CUL KSD301 Shutoff Thermostat,Normally Open NO Bimetal Snap Disc 125V 16A Auto Reset

uxcell KSD301 termostat 40°C/104°F 10A normalno otvoren N.O. Podešavanje temperaturnog prekidača na disk

I. Core Features
‌Operation Principle‌
When the temperature rises to the set value, the contact automatically connects the circuit; when the temperature drops to the reset value, the contact automatically disconnects the circuit, which is the opposite of the normally closed type (disconnected when the temperature rises and connected when the temperature drops).

The bimetallic strip is heated and deformed to trigger the mechanism to achieve fast switching.

‌Technical Parameters‌
‌Električne specifikacije‌:
Nazivni napon: AC 250V (otporno opterećenje) or AC 125V (UL standard)
Nazivna struja: 5A/10A/15A (otporno opterećenje)
‌Temperature performance‌:
Action range: 0℃~300℃ (customizable), accuracy ±2℃~±10℃17
Reset and action temperature difference: 8℃~100℃ (adjustable)
‌Mechanical characteristics‌:
Otpor kontakta: ≤50mΩ, insulation resistance: ≥100MΩ13
Električna snaga: AC 1800V/1min without breakdown
Vek trajanja: ≥100,000 times17 (some models up to 150,000 times2)

‌Physical characteristics‌
Nivo zaštite: IP00 (no dust and water resistance)
Metoda ožičenja: plug-in terminal 250# ili 187# (angle 0°~90° optional)
Način ugradnje: supports various structures such as movable ring, flat ring, aluminum cover with holes, itd.

Normally Open State:
The KSD301 is designed to have its contacts in an open state when the surrounding temperature is below the specified operating temperature. This means the circuit connected to the KSD301 is broken, preventing current flow.

Temperature Trigger:
As the temperature increases, the bimetallic disc (made of two different metals bonded together) responds to the temperature change. The two metals expand at different rates, causing the disc to bend.

Circuit Closure:
When the temperature reaches the set point, the disc bends enough to close the circuit, establishing a connection between the contacts. This allows current to flow through the circuit.

Automatsko resetovanje:
Once the temperature drops below a certain level, the bimetallic disc returns to its original shape, opening the circuit again and cutting off the current flow. This is an automatic reset feature.
U suštini, the KSD301 is used as a thermal switch to control current flow based on temperature, acting as a temperature sensor and protector for various applications.

II. Application scenarios
‌Kućni aparati‌: dispenzeri za vodu, electric thermos, mikrotalasne pećnice, ormari za dezinfekciju, električni grijači, aparati za kafu, itd.
‌Industrijska oprema‌: zaštita motora od pregrijavanja, rectifier equipment, mašine za laminiranje, car heated seats, etc.57.

III. Detection method (determine whether it is normally open)
‌Multimeter detection‌:
At room temperature (‌below the action temperature‌): the resistance of the two pins should be infinite (otvoreni krug).
After heating (‌above the action temperature‌): the resistance value drops to ‌tens of ohms‌ (otvoreni krug).
‌Marking distinction‌: The product body is usually marked with “NO” (Normalno otvoren) ili “Normalno otvoren”.

IV. Prednosti proizvoda
Velika brzina odgovora, clean contact action without arcing57;
High temperature control accuracy, strong reliability7;
Compact structure, strong adaptability17.

⚠️ Note: The actual selection needs to confirm the specific temperature threshold (such as 85℃, 95℃, itd.) and the reset temperature difference. The parameters of different models may vary.