Key Specifications Parameter Specification Brand OMRON Model D4N-4232 Series D4N Product Type Safety Limit Switch Actuator Type Roller plunger (9.5 mm dia. × 5 mm, resin roller) Operating Mechanism Snap action (direct circuit opening operation included) Contact Form 2NC (DPST-NC) Switch Function On-Momentary Conduit Entry M20 (1 conduit) Terminal Type Screw terminal Protection Rating IP67 (dust-tight, waterproof) Classification Class II (Double insulation) Operating Temperature -30°C to 70°C (no icing) Ambient Humidity 95% RH max. Housing Material Plastic Mechanical Life 15,000,000 operations min. Electrical Life 300,000 cycles min. Permissible Operating Frequency 30 operations/min max. Mounting Method Chassis mount / Front mounting Mounting Hole Pitch 20–22 mm Weight Approx. 65-105 g (depending on configuration) Electrical Ratings Parameter Specification Rated Current (AC resistive load) 3 A at 240 VAC Rated Current (DC resistive load) 270 mA at 250 VDC Rated Current (125 VDC) 0.55 A 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 Operating Force (OF) 6.5 N max. (approx. 663 gf) Release Force (RF) 1.5 N min. (approx. 153 gf) Pre-Travel (PT) 2 mm max. Movement Differential (MD) 1 mm max. Over-Travel (OT) 4 mm min. Total Travel (TT) 6 mm (reference value) Operating Position (OP) 28.6 ± 0.8 mm Direct Opening Force 20 N min. Direct Opening Travel 3.2 mm min. Dimensions Parameter Value Width (W) 31 mm Height (H) 31.5 mm Length / Depth (L/D) 83.6 mm Actuator Roller Diameter 9.5 mm 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 Machinery Directive Conforms Low Voltage Directive Conforms