Key Specifications Parameter Specification Brand OMRON Model D4N-8D2HR Series D4N Product Type Pull-reset Safety Limit Switch Reset Method Pull-reset (manual reset) Actuator Type Adjustable roller lever, form lock (metal lever, rubber roller, φ50 × 8, R32 to 66) Operating Mechanism Slow action (direct circuit opening operation included) Contact Form 3NC (DPST-3NC) Conduit Entry M20 (2 conduits) Terminal Type Screw terminal Protection Rating IP67 (dust-tight, waterproof) Classification Class II (Double insulation) Ambient Temperature (Operating) -30°C to 70°C (no icing) Ambient Humidity 95% RH max. Permissible Operating Frequency 30 operations/min max. Mechanical Life 1,000,000 operations min. Electrical Life 300,000 cycles min. Electrical Ratings Parameter Specification Rated Current (AC resistive load) 3 A at 240 VAC Rated Current (DC resistive load) 270 mA at 250 VDC / 0.55 A at 125 VDC Switched Voltage (AC) 240 VAC max. Switched Voltage (DC) 250 VDC max. Contact Resistance (Initial) 25 mΩ max. Insulation Resistance 100 MΩ min. Impulse Withstand Voltage Same polarity: 2.5 kV; Different polarity: 4 kV; To non-live-metal: 6 kV Operating Characteristics Parameter Specification Pre-Travel (PT) - NC open 18 to 27° Total Travel (TT) 80° (reference value) Locking Force (LF) 5.4 N max. (reference value) Locking Travel (LT) 55° max. (reference value) Direct Opening Force 20 N min. Direct Opening Travel 50° min. Operating Speed Range 1 mm/s to 0.5 m/s Environmental & Physical Ratings Parameter Specification Vibration (Malfunction) 10 to 55 Hz, 0.75 mm single amplitude Shock (Destruction) 1000 m/s² Shock (Malfunction) 300 m/s² Mounting Method Chassis mount / Front mounting RoHS Compliant Standards & Certifications Standard Compliance EN60947-5-1 TUV (approved direct opening) UL508 UL Listed CSA C22.2 No.14 CSA Certified GB14048.5 CCC (CQC) Certified EN115-1, EN81-1/50 Compliant (slow-action models) Machinery Directive Conforms Low Voltage Directive Conforms