The Omron MY4N-J 240VAC 14-Pin Electromagnetic Relay is an industrial-standard, miniature power plug-in relay engineered for automated control panels, PLC output isolation, motor contactor interlocking, and multi-circuit power switching. Featuring a 4PDT (4 Pole Double Throw / 4 Form C) contact configuration, it enables simultaneous switching or isolation of four independent electrical circuits. Equipped with an integrated red LED operational indicator and mechanical flag indicator, it allows technicians to visually confirm coil energization and contact position at a glance. It mounts into standard 14-pin DIN-rail sockets (such as the PYF14A / PYF14A-E series), making it widely deployed across commercial HVAC, factory automation, and electrical distribution infrastructure.

Specifications

• Brand / Model Series: Omron MY4N-J Series (Miniature Power Relay)
• Relay Type: Electromagnetic General-Purpose Plug-in Relay
• Contact Arrangement: 4PDT (4 Form C: 4 Normally Open [NO] + 4 Normally Closed [NC] + 4 Common [COM])
• Pin Configuration: 14-Pin Flat Blade / Solder Lug Terminals
• Rated Coil Voltage: 220 V AC to 240 V AC (50/60 Hz)
• Coil Operating Voltage Limits:
  • Must-Operate Voltage (Pickup): ≤ 80% of rated voltage (~192V AC)
  • Must-Release Voltage (Dropout): ≥ 30% of rated voltage (~72V AC)
  • Maximum Permissible Voltage: 110% of rated voltage (264V AC)
• Coil Power Consumption: Approx. 0.9 VA to 1.2 VA (AC 50/60 Hz)
• Contact Rating (Resistive Load - cosφ = 1):
  • AC Rating: 3 A at 220V–250V AC (Standard general use: up to 5A at 240VAC on specific sub-grades, 3A standard inductive/resistive nominal)
  • Low AC Rating: 3 A at 125V–150V AC
  • DC Rating: 3 A at 28V–30V DC
• Maximum Switching Voltage: 250 V AC / 125 V DC
• Maximum Switching Current: 3 A (Continuous current per pole)
• Contact Material: Silver Alloy / Gold-Clad Silver (Ag + Au-plated for low-level signal reliability)
• Contact Resistance: ≤ 50 mΩ to 100 mΩ (Initial value at 1A, 6V DC)
• Dielectric Breakdown Voltage:
  • Between Coil and Contacts: 2,000 V AC, 50/60 Hz for 1 min
  • Between Contacts of Different Polarity: 2,000 V AC, 50/60 Hz for 1 min
  • Between Open Contacts of Same Pole: 1,000 V AC, 50/60 Hz for 1 min
• Insulation Resistance: ≥ 100 MΩ (at 500 V DC megger)
• Operating / Response Times:
  • Operate Time: ≤ 20 ms
  • Release Time: ≤ 20 ms
• Life Expectancy:
  • Mechanical Life: ≥ 50,000,000 operations (at 18,000 ops/hour)
  • Electrical Life: ≥ 100,000 to 500,000 operations (at rated resistive load)
• Operating Indicators: Integrated Red LED Coil Status Indicator + Mechanical Target Flag
• Operating Temperature Envelope: -55°C to +70°C (Without condensation or freezing)
• Compatible Socket Base: PYF14A, PYF14A-E, PY14, PY14-02 (PCB socket)
• Net Weight: Approx. 35 g

Features

• 4PDT Multi-Circuit Isolation: Four fully isolated poles allow simultaneous switching of auxiliary signal loops, high-voltage contactor coils, status indicators, and PLC digital inputs from a single coil control signal.
• Dual Visual Indicators: Combines an electronic LED that illuminates when the coil is energized with a bright orange/red mechanical target flag that physically shifts when the armature pulls in, distinguishing between electrical coil faults and mechanical contact binding.
• High Dielectric Isolation: 2,000V AC isolation between coil and contacts protects sensitive digital control electronics from inductive line spikes and transients.
• Arc Barrier Separation: Molded internal arc barriers between adjacent contact poles prevent phase-to-phase flashover when switching multiphase AC loads.
• Plug-in Maintenance Architecture: Designed for tool-free replacement into DIN-rail socket bases, eliminating the need to disconnect field wiring during relay replacement.

Common Applications

• Industrial Control Panels: Interfacing 240VAC mains line controls with motor starters, pneumatic solenoid valves, and warning beacons.
• HVAC Automation: Sequencing compressor contactors, circulation fan relays, and damper actuators in building automation systems.
• PLC Output Interfacing: Isolating PLC digital outputs from inductive field equipment to prevent back-EMF spikes from damaging controller output cards.
• Safety Interlocking & E-Stop Loops: Providing multi-contact feedback loops for guard doors, machine safety curtains, and power interlocks.
• Water Pump & Generator Control: Managing auto-transfer switches (ATS), float switch level automation, and generator starting sequences.

Usage Tips & Pinout Configuration

• 14-Pin Terminal Mapping (Standard Socket / Relay Layout):
  • Coil Terminals: Pins 13 and 14 (Connect 240V AC control line; non-polarized on AC coil models).
  • Common (COM) Terminals: Pins 9, 10, 11, 12 (Poles 1 through 4).
  • Normally Closed (NC) Terminals: Pins 1, 2, 3, 4 (Paired respectively with Commons 9, 10, 11, 12 when de-energized).
  • Normally Open (NO) Terminals: Pins 5, 6, 7, 8 (Paired respectively with Commons 9, 10, 11, 12 when energized).
• Wiring with DIN Rail Sockets (PYF14A):
  • Always mount the relay onto a rated PYF14A or PYF14A-E screw-terminal base mounted to standard 35mm DIN rail.
  • Use the metal retaining spring clip included with the socket to lock the relay housing firmly into the base, preventing loosening caused by machine vibration.
• Inductive Load Snubbing:
  • When using the relay contacts to switch inductive loads (such as solenoid valves or larger contactor coils), install an RC snubber network (0.1 μF + 100 Ω rated for 400V) across the load contacts to suppress arcing and prevent contact pitting or welding.
• Electrical Safety Warning:
  • Ensure the main breaker or control circuit power is locked out and de-energized before inserting, removing, or wiring the relay socket base. Pins 13, 14, and switched contact terminals carry lethal 240V AC line potential.