D4B Limit switches Limit switch with metal housing The D4B series of limit switches in a rugged metal housing is suitable for both safety and non-safety applications due to its direct opening mechanism and TÜV approval. Furthermore with the increased temperature range and enhanced mechanical switching life- time,theD4B is first choice for all applications from standard to demanding environ- ments and for highest flexibility in mountingand connectivity preferences. • Direct openingmechanismand approval by notifiedbody • Rugged metal housing and extended mechanical switching lifetime (snap action models) • Terminal block for direct wiring Ordering information Actuator type Connection method Order code*1 1NC/1NO (snap-action) 1NC/1NO (slow-action) 2NC (slow-action) Roller lever*2 Terminal block with M20 conduit*3 D4B-4111ND4B-4511ND4B-4A11N Adjustable roller lever D4B-4116ND4B-4516ND4B-4A16N Adjustable rod leverD4B-4117ND4B-4517ND4B-4A17N Plain D4B-4170ND4B-4570ND4B-4A70N Roller D4B-4171ND4B-4571ND4B-4A71N Coil spring D4B-4181N*4 –– Plastic rod D4B-4187N*4 –– *1The NC contacts provide the approved direct opening mechanism. *2For models with stainless steel rollers and temperature resistance of -40°C refer to WL-_-TC. *3Models with G1/2 or 1/2"14NPT conduit are available. For ordering refer to complete datasheet. For PG13.5 conduit models for non-safety applications contact yourOMRON representative. *4No direct opening mechanism. Specifications Item Snap-actionSlow-action Durability*1 Mechanical 30,000,000 operations min.10,000,000 operations min. Electrical500,000 operations min. (at a 250VAC, 10 A resistive load) Operating speed1 mm/s to 0.5 m/s Operating frequency Mechanical 120 operations/min Electrical30 operations/min Rated frequency50/60 Hz Contact resistance 25 m max. (initial value) Pollution degree (operating environment)3 (EN60947-5-1) Conditional short-circuit current 100 A (EN60947-5-1) Conventional enclosed thermal current (Ith)20 A (EN60947-5-1) Protection against electric shockClass I (with ground terminal) Ambient temperatureOperating–40 to 80°C (with no icing)*2 Degree of protectionIP67 (EN60947-5-1) *1The values are acquired for an ambient temperature of 5 to 35°C and an ambient humidity of 40% to 70%. *2–25 to 80°C for the flexible-rod actuator. 288 D4B Limit switches 1NO/1NC Contact (Snap-action) If metal deposition betweenmating contacts occurs on the NC contact side, they can be pulled apart by the shearing force and tensile force generatedwhen part B of the safety cam or plunger engages part A of the movable contact blade. When the safety cam or plunger is moved in the direction of the arrow, the Limit Switch releases. 1. When metal deposition occurs. 2. When contacts are being pulled apart. Movable contact 3. When contacts are completely pulled apart. Movable contact blade Fixed contact (NC) Plunger Safety cam Safety cam directly pushes up the movable contact blade. 1NC/1NO Contact (Slow-action)2NC Contact (Slow-action) Fixed contact (NC) Fixed contact (NC) Contact spring Return spring Movable contact Plunger Contact spring Return spring Movable contact Plunger Fixed contact (NO) NC contacts conform to EN60947-5-1 Direct Opening When metal deposition occurs, the contacts are separated from each other by the plunger being pushed in. is marked on the product to indicate approval of direct opening. 289
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