Omron D4SL-N4EFA-D4 Guard Lock Safety Door Switch – 24VDC Power to Release, 2NC/1NO + 1NC/1NO, IP67

The Omron D4SL-N4EFA-D4 is a high-performance guard lock safety-door switch designed for reliable operator protection and machine access control. Featuring a power-to-release (mechanical lock) mechanism and a 24VDC solenoid, this model ensures machinery remains safely locked during operation, releasing only under controlled conditions.

The switch provides dual circuits for redundant safety feedback with 2NC/1NO door contacts and 1NC/1NO lock monitor contacts. Its robust resin head and IP67-rated housing make it ideal for use in harsh industrial environments. An integrated LED indicator provides quick visual status confirmation, while the M20 conduit entry and standard D4SL-N mounting simplify installation.

Technical Specifications

Model: D4SL-N4EFA-D4 Omron
Series: D4SL-N Guard Lock
Function: Guard lock safety-door switch (bolting type)
Lock Type: Mechanical lock – Power to Release
Solenoid Voltage: 24 VDC
Contact Configuration: 2NC/1NO (door) + 1NC/1NO (lock monitor)
Holding Force: 1.3 kN (1300 N)
LED Indicator: Built-in (status display)
Form Factor: Cuboid – M20 conduit
Colour: Black/Red
Ideal For: Guarding robots, conveyors, and high-risk automation cells

Electrical Specifications

• Supply Voltage: 24 VDC
• Contact Ratings: 120 VAC / 1.5 A
• Rated Insulation Voltage: 250 VAC
• Contact Type: Redundant electromechanical
• Switch Action: Slow action (positive opening)
• Solenoid Logic: Power to Release (mechanical lock engaged when power is off)
• LED Indicator: Integrated – power and lock status

I/O & Control Interface

• Door Contacts: 2NC/1NO
• Lock Monitor Contacts: 1NC/1NO
• Connection Type: Terminal block (screw terminals)
• Key Type: Standard mechanical actuator (sold separately)
• Compatible Actuators: D4SL-NK1, D4SL-NK2, D4SL-NK3, D4SL-NK5 series
• Communication: Not supported (hardwired safety device)

Mechanical Specifications

• Housing Material: Plastic
• Head Material: Resin
• Shape: Cuboid
• Dimensions (W x H x L): 39 × 39 × 179.9 mm
• Mounting Style: Chassis / Panel mount
• Conduit Entry: M20 threaded
• Mechanical Durability: 1,000,000 operations
• Weight: 388 g

Environmental Specifications

• Operating Temperature: -10°C to +55°C
• Storage Temperature: -25°C to +65°C
• Humidity: 5–95% RH (non-condensing)
• Degree of Protection: IP67 (dust-tight and waterproof)
• Application Category: Industrial machinery and automation safety systems

Compliance & Certifications

• CE Marked: Yes
• UL / cUL Listed: Yes
• TÜV Certified: Yes
• RoHS Compliant: Yes
• EN ISO 14119 Compliant: Yes
• Standards: IEC/EN 60947-5-1, IEC/EN 60947-5-3

Key Features & Benefits

✅ Power to Release (24VDC). Lock remains engaged when power is off for fail-safe security.

✅ Redundant Safety Contacts. Dual-channel monitoring for door and lock status.

✅ 1.3kN Holding Force. Ensures reliable mechanical retention under load.

✅ LED Status Indicator. Provides quick visual lock status confirmation.

✅ IP67 Rating. Dustproof and waterproof for industrial use.

✅ Durable Design. Rated for over 1 million mechanical operations.

📦 Order the Omron D4SL-N4EFA-D4 from Drive Outlet Megastore

At Drive Outlet Megastore, we offer unbeatable Omron D4SL-N4EFA-D4 prices, delivering reliable, TÜV-certified interlock switches for advanced safety systems. Compact, durable, and engineered for dependable protection in demanding automation environments.

Check stock now or request a quote.

Lock securely. Operate safely. Omron engineered — only at Drive Outlet Megastore.