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NO AC Load SSR with DC control - del30009

This is another PCB Mount SSR or Solid State Relay. Can Go a bit better on the Amps than the Slim PCB-SSR shown earlier, which is more of an I/O Module for interface from digital circuits to contacters. This circuit is the same, a bigger box, with a alumina filled epoxy and a Small Aluminum plate on top, this way more Load is possible.

Here is an Embedded System that could make use of such Relays - CAn Remote Automation-Control with AVR

This ability to carry more load, does not depend on circuit, yes the tracks have to be reinforced by copper braid for higher currents. Or thick copper strands. The main issue is to get the heat off the BTA16-600 Triac.

16A 600V is good, provided load short circuit is avoided, inductive loads are taken care of. and the heat from triac which increases with more current. has to be pumped out from the aluminum plate to surrounding air.

You certainly need to know about the "The Seniors" The Electromechanical Relays and Contactors.

This is a SSR that was custom made as a Stackable Output Module. It is maent for PC Mount low current applications and generally drives an external Contacter to Power the Motors or Heaters.

Now the Silpad or Mica can be Avoided for BTA16-600 Type of devices, (see datasheet) The Metal tab or sometimes a Non-metal tab of other devices offer kilo-volts of insulation. You can take extra precaution with mica-silpad or a thin layer of thermally conductive epoxy. But this will reduce its Amps or Load abilities.

In a SSR the circuit is not everything, the PCB, the engineering, the production, testing will ensure you can give rugged industrial grade products.

DC-AC Solid State Relay or SSR

PNG-Schematic  PCB - DT  L1  L2  SS  SM
NO AC Load SSR with DC control - del30009

This SSR output module was encapsulated in a fire-retardant plastic box. It was for PCB mounting, capable of 2-3 amps current without heatsink. The footprint was small. The outputs would go to Terminal Blocks on PCB and Inputs to DC drivers from digital systems. Learn more about types of plastic here, Plastic Materials Table .


The PCB will look like the images shown below. This is a double sided PCB. It has conducting Holes called PTH or plated-through-hole. When you rework these PCBs or remove components the conduction path may break. Learn more about PCB Process here.