These were used in controllers like this -
Blind Dial Analog Temperature Controller
This is another common SSR which is used in Relay Logic too.
In the Control Panel we could encounter a need to reverse the
logic and drive a contacter. Sometime a relay has to operate
when a Timer is turned on. This SSR turns on with the AC Power
Signal and has High Impedance Input and drives a Motor, Heater
Bank or Fan. The current rating has to exceed the load that
you are using. Use a HRC fuse in Series.
See how a Normal Magnetic Relay is Interfaced -
Relay Driver - Electromagnetic
A high voltage plastic cap limits current to a bridge which generates a small DC from 230 V AC, this drives MOC3041. The rest is the same. It is better to use a DC control SSR where possible. This AC control SSR is used where only an AC control signal is available. The BTA series has the heatsink tab insulated from the Triac chip inside. The BTB needs electrical insulation to the heatsink.
These devices BTA40600 and MOC3041 make SSR’s very simple.
They have proved very reliable and rugged in the field,
overrate your designs, use heat sinks and seal the SSR with
thermally conductive epoxy. Alumina with ciba araldite without
any other filler or dye is the best way to hermetically seal.
The MOC303XM and MOC304XM devices consist of a AlGaAs infrared emitting diode optically coupled to a monolithic silicon detector performing the function of a zero voltage crossing bilateral triac driver. MOC3041
They are designed for use with a triac in the interface of logic systems to equipment powered from 115 VAC lines such as teletypewriters, CTRs, solid-state relays, industrial controls, printers, motors, solenoids and consumer appliances, etc.
See the original Motorola Application below.
The were used to control Heaters from DC control signal from
a Proportional Temperature Controller. The Magnetic Contactors
can be avoided for lower powers. At higher powers SCR banks
become a bit expensive. The SSR has no mechanical wear and
tear but heat up at high currents. So if we overrate by 5
Times then it is an excellent solution for lower power
controls upto 5 Kilo Watts. The cycle time of Contactors must
be 20-60 Seconds to make it last long. In a SSR a one second
cycle time is possible as 10-20mS is the switching speed due
to zero crossing.
10th Jun 2020
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