RELAY BOARDS
Products/Index New Products Prices & Sales Home
RELAY BOARD
The relay board has 4 double pole relays and a power supply. This allows the board to be powered by either AC or DC. All the relay contacts are accessible for wiring from screw terminals. Four LEDs are fitted to the board. Each LED lights when its associated relay is energised. The power supply allows the relay board to be powered from either 12 to 16 volts AC or DC. The relays are rated for switching a current up to 3 amps.
The relays operate when "S" is connected to 0 volts.  
The terminals are arranged so that "C" is common "A" is normally closed and "B" is normally open. 
 The number after the letter refers to the pole of the relay.  
The first relay has poles "1" and "2", the second "3" and "4", the third "5"and "6" and the fourth "7" and "8". 
 If the top right "S" is connected to 0 volts the relay contacts will connect "C3" to "B3"; and "C4" to "B4".
Disconnecting 0 volts would connect "C3" to "A3" and "C4" to "A4". 
The Relay Board is also available with 2 double pole relays. 
LATCHING RELAY BOARD
The latching relay board terminal has the same arrangement of relay contacts as the relay board. The difference is that the latching relay board has extra electronics to latch the relays.
Connecting 0 volts to the "set" ("S") terminal switches on the relay. 
The relay remains switched on after the 0 volts is removed. 
When 0 volts is connected to the "reset" ("R") terminal the relay switches off and stays off after the 0 volts is removed. 
It is the initial pulse of 0 volts onto "S" or "R" which switches the relay on or off.
IRDOTs, IRDASCs, IRDOT-Ps, push button switches, dual delay timers, and relay contacts can all be wired to operate the "set" and "reset" terminals.
The applications for this unit are numerous. As each relay is double pole its contacts can be wired to reverse the track power. This allows use for passing loops and shuttles. It can also be used for signalling, automatic level crossings, switching power to tracks, slow motion point motors etc. 
Further flexibility is possible by connecting several devices to operate the same "set" or "reset" terminal. By connecting "S" terminals and "R" terminals a 4, 6 or 8 pole relay can be formed.
The Latching Relay Board is also available with 2 double pole relays.

SPECIFICATION
Voltage 12 to 16 volts, AC or DC

SIZE
  Inches Millimetres
Length x Width 3.9 x 2.7 100 x 68