The Omron MY4N-J 12VDC is a classic, highly reliable 4-pole miniature power relay designed for industrial control panels, automation systems, and electrical isolation networks. Featuring a 4PDT (4 Form C) contact configuration, this plug-in electromagnetic relay allows a low-power 12V DC control circuit to switch up to four independent high-voltage AC or DC load circuits simultaneously. The integrated "N" designation signifies an onboard LED status indicator for quick visual diagnostics inside control cabinets.

Specification

• Manufacturer / Design Family: Omron Industrial Automation (MY Series)
• Model Suffix Coding Breakdown (MY4N-J):
  • MY: General-purpose miniature power relay series
  • 4: 4PDT (4 Changeover / Form C contacts)
  • N: Built-in operational LED indicator light
  • J: Standard international production specification mark
• Coil Nominal Voltage (VCOIL): DC 12V
• Coil Power Consumption: Approx 0.9W (Approx 75mA pull-in current draw)
• Contact Pole Configuration: 4PDT (4 Pole Double Throw / 4 x NO + 4 x NC)
• Max Switching Contact Ratings:
  • AC Load: 3A at 240V AC (Resistive load)
  • DC Load: 3A at 28V DC (Resistive load)
  • (Inductive loads typically rated at 1.5A at 240V AC / 28V DC)
• Contact Material: Silver alloy (Ag alloy contacts for low contact resistance)
• Pin Array & Form: 14-Pin Blade / Plug-in Solder Terminals (Industry standard Pyrex/Ice-cube relay profile)
• Dielectric Strength: 2,000V AC between coil and contacts (50/60 Hz for 1 minute)
• Mechanical Life Expectancy: ≥ 50,000,000 operations min.
• Electrical Life Expectancy: ≥ 100,000 operations min. (at rated load capacity)
• Target Socket Base: PYF14A / PYF14A-E / PY14 (Standard 35mm DIN-rail socket base)

Features

• 4PDT Quad-Channel Circuit Switching: Houses four completely isolated single-pole double-throw (SPDT) switches driven by a single central electromagnet. This enables a single 12V signal to toggle multiple independent feedback loops, signal indicators, and power contactors at the same time.
• Visual LED Operation Tracking ("N" Variant): Features a high-visibility LED built directly inside the clear poly-carbonate housing. The light illuminates brightly when the 12V DC coil is energized, making panel maintenance, fault-tracing, and logic debugging simple.
• Clear Polycarbonate Protective Housing: Encased in a transparent, dust-proof plastic shell ("ice-cube" design) that shields the delicate switching contacts and mechanical springs from ambient industrial dust while allowing visual inspection of internal mechanical movements.
• Standardized 14-Blade Plug-in Footprint: Designed to snap securely into 14-pin DIN-rail mounting sockets (e.g., PYF14A). This allows for quick, tool-less relay replacements without rewiring the control panel terminals during field maintenance.

Common Applications

• PLC & Controller Output Isolation: Protecting delicate microcontroller, PLC, or single-board computer outputs from back-EMF voltage spikes generated by high-power industrial motors, valves, and solenoids.
• Complex Interlocking Control Logic: Building hardwired safety interlocks, manual/auto transfer switches, and reverse-polarity motor control circuits inside machine automation panels.
• Multi-Voltage Signal Multiplication: Using a single 12V DC control signal to trigger multiple independent loads running on different voltage rails (e.g., simultaneous switching of a 240V AC horn, a 24V DC indicator light, and a 5V logic signal).
• Industrial HVAC & Water Pump Control: Activating motorized water valves, heating elements, and exhaust fans in commercial building management systems.

Professional Usage & Deployment Tips

• Observe Coil Polarity for DC LED Relays: Because the MY4N-J 12VDC features an internal status LED, coil polarity matters. You must connect +12V DC to Pin 14 and Ground to Pin 13. If you reverse the polarity, the relay mechanical coil will still pull in, but the diagnostic LED indicator light will fail to illuminate.
• Deploy Flyback Protection Diodes on Driving Transistors: When driving the 12V relay coil using a transistor, MOSFET, or microcontroller interface, always wire a flyback diode (e.g., 1N4007) in reverse parallel across coil pins 13 and 14 (Cathode to Pin 14, Anode to Pin 13). When the relay turns off, the collapsing magnetic field creates a high-voltage back-EMF spike that can instantly fry driving transistors if unsuppressed.
• Derate Ratings for Inductive & Capacitive Loads: The 3A rating applies to purely resistive loads (such as heating elements or filament lamps). When switching inductive loads like AC contactor coils, solenoids, or small electric motors, the severe inrush and inductive kickback will pit or weld the silver contacts over time. Derate the continuous switching current to 1.0A - 1.5A max for inductive applications.
• Use DIN-Rail Sockets for Clean Installations: Avoid soldering wires directly to the relay's 14 blade terminals in permanent panel setups. Always pair the relay with a standard PYF14A DIN-rail socket with screw or spring terminals. This simplifies field maintenance, as a blown or worn-out relay can be pulled out and swapped in seconds without a soldering iron