AC or DC Latching Relay with DPDT contacts A relay with a memory

• Latching power relay with DPDT double-pole, double-throw contacts, plus
  • quick-connect or screw terminals
  • flyback voltage protection, and
  • printed circuit board for convenient mounting.
• May be used with model railroad 'snap' switches for position feedback, signal lights or routing frog power.
• Latching feature ensures that this relay will maintain its same position when system power is turned off.

Dual coils, 12v AC or DC operation heavy duty 8 amp contacts latching relay module and schematic download the pdf     • Coils may be actuated by 10 to 15 volts AC or DC. • 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.

LARY-AC Example circuits 1. Add electrical contacts for signal switching to a twin-coil, 3-wire 'snap' switch machine:   2. Using transistor switches to actuate the latching relay:   3. Use LARY-AC with Lionel Fastrack® switch [pdf].

12v DC dual-coil or single-coil operation heavy duty 8 amp contacts latching relay module and schematic download the pdf     • 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.

LARY-DC Example circuits 1. Add electrical switching to a single coil, 2-wire 'snap' switch machine, such as Kato, LGB or AristoCraft:   2. Use push buttons to control the direction of a slow motion switch machine (Tortoise, SwitchMaster or Cobalt Classic) or other DC motor:

12v DC single-coil latching relay DPDT contacts rated for 2 amps latching relay module and schematic download the pdf     • Coil actuated by 10 to 16 volts DC. • Reverse the coil voltage polarity to change the contact position. • Coil resistance: 1400 ohms. • On-board varistor to limit the coil flyback voltage.   • Also compatible with stall-motor switch machines. Add position feedback contacts to Switch Master, Switch Tender, Tortoise and Cobalt Classic.

LARY-DCS Example circuits Electrical contacts for signal switching or position feedback for a Kato single coil, 2-wire 'snap' switch machine: Note - for LGB and AristoCraft switch motors, use the LARY-DC relay above, not the LARY-DCS relay. Connecting LARY-DCS latching relay to a Kato track switch by modifying a Kato 24-841 turnout extension cord: • Cut the 24-841 cable • Strip all wire ends • Twist the two red wire ends together • Twist the two black wire ends together • Insert the red wire ends into relay terminal KC • Insert the black wire ends into relay terminal KB turnout extension cord 35 inch (90 cm) length for N scale and HO

LARY-DCS relay adds turnout contacts to a SwitchMaster or SwitchTender switch motor.

LARY-DCS relay adds more turnout contacts to a Tortoise switch motor.

 
For signals that have LEDs, always use a DC power source and current limiting resistors, as shown here:

 
 
Kato and Aristocraft / LGB switch machines are single coil, as shown here:

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

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