AC/DC 40A SSR-40DA Relay solid state relay AC SSR- Relay solid state relay

SSR-40DA Relay

Description

SSRs produce less electromagnetic interference than mechanical relays during operation. This is mostly due to the absence of a phenomenon called contact arcing only present in mechanical relays, where the physical contacts of the relay tend to spark internally while switching. SSRs do not use electromagnets to switch.

The switch contacts of a mechanical relay will eventually wear down from arcing. An SSR will have a longer life because its internals are purely digital. Properly used, they will last for millions of cycles.
SSRs turn on and off faster than mechanical relays (≈1ms compared to ≈10ms).
SSR-40DA Relay are less susceptible to physical vibrations than mechanical relays.
Since the switch inside an SSR isn’t a mechanical switch, it does not suffer from contact bounce and operates silently.

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Solid state relay ( SSR ), belongs to electronic contactless switch.

The main characteristics are:

• small control signal input, directly driving high current load.
• It is widely used,for example
• used together with temperature control instrument,
• can quickly control the electric heaters.

» Advantages:

• long service life,
• contactless ,
• no spark,no noise,
• no electromagnetic interference,
• fast switching speed,
• strong anti-interference capability,
• reliable work,
• and has the advantages of small volume,
• vibration resistance,
• explosion prevention,
• corrosion prevention,
• compatible with such integrated circuit as TTL, DTL, HTL and so on. .

» Insufficiency:

Output contact is not so much as contactor,only one group;

in addition,due to pressure, temperature rises quickly if the load is above 5A.

So you must pay attention to heat dissipation.You can also use special solid state heat sink.

» Attention of first use:

This product can only control the resistive electrical appliances, like a series of electrical heating appliances as electric wire, electric heating pipe,and there must leave 3/2 margin of the selection current size,pay attention to heat dissipation when current is above 5A!