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Solid State Relays

Six SSRs on one module with quick-connect terminals

SSR6 relay module
Download the SSR6 installation guide [pdf]

• Six solid state relays on one circuit board.
• 3 to 25 milliamps DC activation current per relay.
 
Now shipping SSR6 rev. 2 which has input current limiting on board.
Use of an external resistor is optional for SSR6 rev. 2 and higher.

• Ouput contacts: 0.35 amp max, 30 v AC or DC.
SSR6  $24.00
  • Six single-pole-single-throw (SPST) normally-open (N.O.) relays on one printed circuit board for simple mounting.
  • Spring cage terminal blocks for quick connections.
  • Input current: 3 to 25 milliamps DC.
  • Output contact: 0.35 amp max, 30 volts max ac or dc.
6x solid state relays
SSR6 module schematic
Like mechanical relays, solid state relays (SSRs) allow one electrical circuit to control a second electrical circuit when there is no direct electrical connection between the two circuits. These two circuits are said to be 'isolated' because there is no conductive path between them.

Also like mechanical relays, solid state relays enable a low power circuit to control a load that uses higher voltage or more current.

An advantage of solid state relays over mechanical relays is that solid state relays require much less activation current (typically 3 to 25 milliamps) than mechanical relays.

Solid state relays have no moving parts. They operate silently.

On the down side, solid state relays usually have only one contact, while mechanical relays often have multiple contacts allowing more complex control functions.

SSR connection
Typical connection to one of the six relays on the SSR6 module.
When current flows through the input diode (+CA to -Kn), then the output contact is closed. Otherwise the output contact is open.
 
Resistor R is optional for SSR6 rev. 2 and higher.
 

SSR6 application examples

  • Use with a TS2 block signal circuit to control signals with incandescent bulbs.
    A TS2 circuit by itself can only supply enough power to illuminate signals with LEDs. Old style incandescent bulbs consume more current, so an interface circuit like the SSR6 is required.
  • Because the TS2 circuit has built-in current limiting resistors, no additional resistors are required for this application.
TS2 with SSR6
SSR6 solid state relays enable TS2 to control signals with incandescent bulbs.
Connect power and sensors to the TS2 per the TS2 instructions.
  • Use with a MRD6T or MRD6X HexDetex™ to control incandescent bulbs or mechanical relays.
    A HexDetex™ circuit by itself can only supply enough power to one LED per detector. Incandescent bulbs and mechanical relays need more current, so solid state relays like the SSR6 are required.
  • Because the HexDetex™ circuit has built-in current limiting resistors, no additional resistors are required for this application.
  • Use an SSR6 to connect an MRD6 HexDetex™ to a Digitrax™ DS64 or SE8C decoder. The SSR6 relay provides voltage level translation and electrical isolation for the Digitrax™ inputs. Click here for details...
TS2 with SSR6
SSR6 solid state relays enable an MRD6 HexDetex™ to control incandescent bulbs or mechanical relays.
Connect power and sensors to the MRD6 per the MRD6 instructions.
common anode signals
Switching red/green common anode (+) LED signals.
common cathode signals
Switching red/green common cathode (-) LED signals.

Control up to six red/green LED signals with an SSR6 solid state relay module.
(Two red/green LED signals are shown in each of the above examples.)

Click here for mechanical double pole (DPDT) relays.
Click here for mechanically latching DPDT relays.
 

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