What do the AL, SSR, RELAY contacts in the temperature controller represent and when do they close? Are they just one contact?

2025-04-11 19:13:32 Billy

There are three commonly used output methods in temperature controllers: Relay Output, Solid State Relay Output (SSR), and AL Output.

The relay output controls the on/off of the circuit through mechanical contacts, which is suitable for situations that require high current control. When the temperature reaches the set value, the coil of the relay is energized, the contacts are closed, and the circuit is conductive.

Solid state relays use semiconductor devices instead of mechanical contacts for output, which have the advantages of fast response speed and long lifespan. When the temperature reaches the set value, the semiconductor switch inside the solid-state relay conducts, and the circuit conducts.

It is currently unclear what AL output specifically refers to. In some specific temperature controllers, AL may represent a particular output mode, but the specific function and working principle need further understanding.

Both relay output and solid-state relay output will close when the set temperature is reached, thereby controlling the on/off of the circuit. The specific working mode of AL output may vary, and it needs to be understood according to the specific equipment manual.

It is worth noting that these output methods are not solely composed of a single contact. Relays typically contain multiple contacts to achieve different control requirements. The solid-state relay contains multiple semiconductor switches inside to ensure stable conduction of the circuit.

In practical applications, the choice of output mode depends on specific requirements, such as controlling current size, response speed, lifespan, etc. Users need to choose the appropriate output method based on their actual needs and device specifications.

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What do the AL, SSR, RELAY contacts in the temperature controller represent and when do they close? Are they just one contact?

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