Omron D4N-4A31 Safety Limit Switch

USD 22.32

IP67 safety limit switch with a top pin plunger and 1NC/1NO slow-action contacts. Features a direct opening mechanism, M20 conduit, and -30°C to +70°C range.

SKU Omron-D4N-4A31 Category
Industrial Limit Switches

Omron D4N-4A31 Safety Limit Switch

Model Identifier D4N-4A31
Official Part Number D4N-4A31
GTIN Standard NA

Technical Overview

The Omron D4N-4A31 is a compact safety limit switch featuring a top pin plunger actuator, direct opening mechanism, and slow-action 1NC+1NO contacts. Housed in a durable, double-insulated plastic enclosure with an IP67 rating, it provides robust protection against dust and water ingress in harsh industrial environments. It includes an M20 conduit entry and operates reliably across a wide ambient temperature range of -30°C to +70°C. Compliant with stringent safety standards like EN ISO 14119, it is engineered for general-purpose safety monitoring, machinery interlocks, and precise mechanical position detection.

Key Features

  • Slow action switch with 1NC and 1NO contact arrangement
  • Direct opening mechanism compliant with EN ISO 14119
  • Top pin plunger actuator for highly precise and repeatable mechanical actuation
  • IP67 ingress protection against heavy dust and water exposure
  • Wide operating ambient temperature range of -30°C to +70°C
  • M20 conduit entry featuring a hinged wiring chamber
  • Double-insulated, rugged plastic housing
  • Minimum mechanical durability of 15 million operations

10A carry current, rated for up to 240VAC / 250VDC with 7200 VA make capability

Technical Specification Matrix

ParameterValue
Actuator TypeTop Pin Plunger
Contact Configuration1NC / 1NO (Slow-action)
Conduit SizeM20
IP RatingIP67
Rated Carry Current10A (A300)
Maximum Voltage240 VAC / 250 VDC
Operating Temperature-30°C to +70°C
Operating Speed1 to 500 mm/s
Max Operating Frequency30 operations/minute
Housing MaterialPlastic (Double Insulation)

Industrial Applications

1. Automated Production Line Safety Interlocks

Ensuring that protective access doors or physical guards on robotic assembly lines are securely closed before machinery operation is permitted.

Problem Solved

Prevents injury to operators by reliably cutting power if a machine guard is breached, utilizing the switch's direct opening mechanism to ensure failsafe contact separation even if contacts weld.

Safety interlockDirect opening mechanismEN ISO 141191NC/1NOSlow-action contact

2. Conveyor System Position Detection & Over-travel Monitoring

Monitoring the physical limits and mechanical endpoints of heavy-duty material handling conveyors to avoid dangerous over-travel.

Problem Solved

The top pin plunger precisely detects mechanical position limits. If a jam or over-travel fault occurs, the IP67-rated switch safely interrupts the motor circuit without failing from heavy industrial dust or moisture exposure.

IP67 ingress protectionTop pin plungerMechanical position detection10A switchingOver-travel limit

3. Industrial Lift and Hatch Access Monitoring

Verifying that maintenance hatches and personnel access gates on industrial lifts or automated guided vehicles (AGV) stations are physically locked closed.

Problem Solved

Operates safely across severe temperature variations (-30°C to +70°C) found in industrial lift shafts, guaranteeing the lift control circuit (up to 240VAC) will not engage unless all gates are mechanically verified as sealed.

Wide temperature rangeA300 ratedSlow-action switching240VAC control logicDouble insulation
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