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AC or DC Latching Relay with Screw Terminals, DPDT contacts

A relay with a memory

  • Latching power relay with DPDT double-pole, double-throw contacts, plus
    • screw terminals
    • flyback voltage protection, and
    • printed circuit board for convenient mounting.
  • Contacts rated for up to 8 amps, 30 volts, sufficient for any model railroad circuit.
  • May be used with an IR train detector to control high current accessories or to automatically switch track power to reversing loops.
  • Latching feature ensures that this relay will maintain its same position when system power is turned off.

Dual coils, 12v AC or DC operation

relay module photo relay module schematic
latching relay module and schematic

 
LARY-AC  $13.75

• Coils may be actuated by 10 to 15 volts AC or DC.
• When actuated with AC voltage, the relay will 'hum' while voltage is applied to the coil.
• When actuated with DC voltage, the 'KC' (common) terminal must be connected to the positive (+) side of the power supply.
• Coil resistance: 240 ohms each.
• Best choice for use with low-side transistor switches, because the flyback voltage of the LARY-AC is clamped at a much lower level than the flyback voltage produced by the LARY-DC relay.
 
Download the LARY-AC package insert [pdf]
Example circuits
1. Add electrical switching for a twin-coil, 3-wire 'snap' switch machine:

turnout application

 
2. Using transistor switches to actuate the latching relay:

transistor drive circuit

Dual coils, 12v DC operation

relay module photo relay module schematic
latching relay module and schematic

 
LARY-DC  $13.75

 
• Coils actuated by 10 to 15 volts DC.
• Common terminal ('KC') may connect to either the positive (+) or negative (-) side of the power supply.
• Coil resistance: 240 ohms each.
• On-board varistors snub the coil flyback voltage to protect the actuating switch contacts.
 
Download the LARY-DC package insert [pdf]
 
Example circuits
1. Add electrical switching to a single coil, 2-wire 'snap' switch machine, such as Kato, LGB or AristoCraft:

DC snap turnout application

 
2. Use push buttons to control the direction of a slow motion switch machine (Tortoise®, SwitchMaster® or Cobalt®) or other DC motor:

Tortoise turnout control

 
For signals that have LEDs, always use a DC power source and current limiting resistors, as shown here:
LED turnout indication
 
For standard single coil relays, click here.
 

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