Name: Omron D4N-4B32 Safety Limit Switch Top Roller Plunger 2NC - INOSAKI
SKU: Omron-D4N-4B32
Price: 24.16 USD
Availability: InStock

Technical Overview

The Omron D4N-4B32 is a miniature safety limit switch designed with a top roller plunger actuator and slow-action 2NC contacts. Featuring an M20 conduit entry, it incorporates standardized gold-clad contacts to ensure high reliability with both standard industrial loads and microloads. Conforming to rigorous international standards such as UL, EN (TÜV), and CCC, the D4N-4B32 utilizes a certified direct opening mechanism that forcibly separates contacts even in the event of welding. Encased in an IP67-rated housing, this highly durable switch guarantees a mechanical lifespan of at least 15 million operations, making it an optimal failsafe component for machine guarding, elevators, and automation interlocks.

Key Features

2NCslow-actioncontactswithcertifieddirectopeningmechanismforfailsafefaultinterruption[1.3]
Top roller plunger actuator with a 9.5 mm diameter resin roller
Standardized gold-clad contacts suitable for both standard loads and microloads
IP67 degree of protection ensures robust sealing against dust and water ingress
M20 (1-conduit) wiring chamber optimized for European export standards
Free of lead, cadmium, and hexavalent chrome for reduced environmental burden
Rated mechanical life of 15,000,000 operations minimum
Wide operating temperature range of -30°C to 70°C

Technical Specification Matrix

Parameter	Value
Actuator	Top Roller Plunger (9.5 mm Resin Roller)
Contact Form	2NC (Slow-action)
Conduit Size	M20 (1-conduit)
Rated Operating Current (AC-15)	3 A at 240 VAC
Rated Operating Current (DC-13)	0.27 A at 250 VDC
Operating Force (OF)	6.5 N max.
Pre-Travel (PT)	2 mm max.
Mechanical Durability	15,000,000 operations min.
Degree of Protection	IP67
Operating Temperature	-30 to 70 °C

Industrial Applications

1. Machine Tool Safety Guard Interlocking

Integrated into access panels and safety doors of CNC machining centers, the top roller plunger detects whether the guard door is fully closed before allowing machine operation. The 2NC slow-action contacts wire directly into the master safety relay.

Problem Solved

Prevents machine startup while safety doors are open by physically disconnecting the control circuit through a direct opening mechanism, entirely eliminating the risk of undetected contact welding failures.

2NC Slow-actionDirect Opening MechanismIP67 EnclosureTop Roller PlungerSafety Interlock

2. Elevator Hoistway End-of-Travel Sensing

Deployed at terminal limits in elevator hoistways or lift shafts, acting as a redundant failsafe limit switch to prevent elevator cars from over-traveling. The switch handles wide temperature fluctuations (-30°C to 70°C) without seizing.

Problem Solved

Stops lift equipment in the event of an over-travel fault by forcing safety circuits open, utilizing the 15 million operation durability and robust 6.5 N actuating force to ensure reliable, code-compliant mechanical stops.

EN 81-20 Compliance15 Million OperationsM20 Conduit6.5 N Operating Force

3. Automated Packaging Conveyor Failsafe Detection

Positioned on diverter gates of heavy-duty packaging conveyors to provide precise positional feedback to the safety PLC. The gold-clad contacts efficiently handle 24VDC logic loads while the resin roller prevents wear on sliding metal guard parts.

Problem Solved

Eliminates intermittent logic-level signal failures in harsh, dusty environments. The gold-clad contacts ensure reliable microload PLC inputs without contact resistance build-up, protected securely by the IP67 housing.

Gold-Clad ContactsMicroload SwitchingIP67 RatingResin Roller ActuatorDC-13 Rating