The Omron LY2 is a high-power, general-purpose "Power Relay" that bridges the gap between a standard control relay and a small contactor. In the elevator industry, it is a "workhorse" component found in both traction and hydraulic controllers. It is designed to handle significantly higher inrush currents than standard miniature relays, making it the go-to for switching brake coils, heavy-duty door operators, and fan motors.

Core Specifications

Manufacturer: Omron Industrial Automation
Part Number: LY2-AC110/120
Number of Poles: 2-Pole (DPDT / 2 Form C)
Coil Voltage: 110V to 120V AC (50/60 Hz)
Contact Rating: 10A @ 250V AC / 30V DC (15A max inrush)
Base Type: 8-Pin Plug-in (Blade terminals)
Construction: Heavy-duty silver-alloy contacts with clear dust cover.

Elevator Logic

2-Pole DPDT Switching: The dual-pole configuration allows for the simultaneous switching of two independent circuits. A common application is using one pole to switch the "Line" side of a 120V AC brake circuit and the second pole to provide a 24V DC feedback signal to the controller's input card.
Brake Pilot Relay: Often used as the "Brake Run" relay. The 120V AC coil is energized by the safety string, while the 10A contacts handle the inductive load of the machine brake coil.
Door Operator Interface: Functions as the "Heavy-Duty" interface for door operators that pull high current during the initial "start" phase of the opening or closing cycle.
Car Fan/Light Control: Manages the high-inrush current of car ventilation blowers and older fluorescent lighting ballasts.

Accessories

PTF08A-E Socket: The standard 8-pin track-mount socket used for DIN-rail or screw mounting in the controller cabinet.
PYC-A1 Retaining Clip: A metal spring clip that locks the relay into the socket, essential for preventing the relay from vibrating loose in high-vibration machine rooms.
Built-in Indicators (N-Suffix): Many LY2 units used in elevators feature a built-in LED or mechanical indicator for immediate visual troubleshooting of the coil state.
Surge Suppressor: RC-circuit modules are often added across the 120V AC coil to prevent electrical noise from causing "ghost" faults in nearby microprocessors.

Maintenance & Code

B44 Safety Limitations: Under Canadian Elevator Code (B44), the LY2 is not a force-guided safety relay. It must not be used for primary safety-critical monitoring (such as door interlock verification) where a welded contact could bypass a safety function.
Contact Pitting: Because this relay often drives inductive loads (coils/motors), the silver-alloy contacts will eventually pit or carbonize. If the relay clicks but the brake fails to lift, check for high resistance across the DPDT blades.
Coil Chatter/Hum: A loud buzzing or "chattering" in a 120V AC relay often indicates a drop in supply voltage or a loosening of the coil laminations. This is a common sign of imminent failure in older controllers.
Terminal Integrity: Ensure the 8-pin blade terminals are clean and seated firmly in the socket. Arcing at the socket base is a frequent cause of intermittent "Power Loss" faults in legacy systems.