What is the difference between scr and ssr

Sheltonus New Member. Joined Aug 13, Messages 1 Reaction score 0. One of its modes is phase angle control, controlled width pieces of current per second. Smooth power, easy to control and monitor. All you need is a signal source and some feedback thermometer and eyeballs, thermostat, etc You must log in or register to reply here.

Similar threads. SSR vs. Coil Relay. Facinerous Feb 10, Replies 11 Views 2K. Feb 10, The10mmKid. Will these ssr's work? Replies 22 Views 2K. May 23, Ohio-Ed. KingMalaka May 24, The hotter they get, the less amperage they actually can switch, so they create heat and they are limited by heat.

Derating curves are critical when evaluating or sizing proper units. Pay attention to what temperature the unit is rated for. Powerblanket was created to understand and solve heating issues relating to total temperature control.

Most industrial heating processes utilize a thermal loop to manage specific temperatures. At the core of the thermal loop is See the bottom of this article SCR — Which is best for you? SSR vs. This looks at how using a thyristor SCR power controller in the right way can save you time and money when it comes to optimising your electric thermal machine.

Click below to receive a copy. The Control of Power Today more than ever, engineers are designing electric process heat systems using SCR thyristor power controls. Take note of rating values Further problems could also arise from the ratings of the SSR. All Rights Reserved. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits.

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The linear controllers prevent the hystereies when used with a setpoint thermistor. You can also adjust gain so this can improve regulation. Too much sensor drift will cause it go full on off with high gain and too little gain will have more overshoot when a door closes or more lag when a cold door opens.

How many cycles per hour you expect depends on the hysteresis. However I assumed proportional control in above remark. THe best controllers include PID signal conditional on temp feedback vs setpoint error. This last one helps protect the wiring, loads and of course the controller itself from overheating. Some support cycle by cycle control, or phase angle control, so that you can use them as a kind of "dimmer" of sorts if the load is appropriate for that kind of control.

A Solid State Relay is just the "guts" so to speak of the SSPC, which is the actual switching part inside without all the fancy features. It requires external control. But if all you want is a replacement for a relay, and you don't need all the fancy features of a SSPC, then these are an alternative to a relay.

Relays have contact arcing and oxidation and erosion and welding issues, plus everything that goes together with physical, moving parts -- longer delays and contact bounce, etc. So very low losses in the switch itself. Their main loss is the coil. It's possible arrange a hybrid of both a relay and an SSR, where you activate both.

The SSR will be faster and will not have arcing problems. Then the relay will engage, but because the SSR is already active there almost won't be any arcing on the contacts and bounce is irrelevant, as well.

So that's nice. Once the relay has finally engaged, it takes over and the SSR no longer dissipates energy. So heat sinking for the SSR isn't nearly so much a concern and can be a lot smaller. I doubt SSMCs can use a hybrid approach inside themselves and still maintain many of their other features. In short, there are options. And that's a nice thing, I suppose. It's just a matter of deciding what's better for the situation. SCRs are small and inexpensive, but are vulnerable to line surges and spikes.

Protection circuitry and CPU-monitoring can be included. Eventually the relay will become erratic, either refusing to close oxide fragments in the way, or when the corroded contacts spot-weld together.