DUK
DUK (Dittelbach und Kerzler) is a German manufacturer of industrial-grade switchgear and sensors, specializing in durable solutions for conveyors, cranes, mining, and bulk handling. Since 1925, DUK has delivered custom-engineered safety switches—including misalignment, pullcord, limit, speed, and tilt devices—manufactured entirely in Germany and certified for ATEX and mining environments.
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Company Overview
Founded in 1925 and headquartered in Giessen, Germany, DUK is a family-operated enterprise with deep roots in industrial switch technology. The company designs and manufactures a wide range of electromechanical safety switches and sensors, tailored for harsh conditions such as explosive atmospheres, mining installations, crane systems, and heavy conveyor operations. DUK operates under the credo “Special is our normal” and exports to numerous global markets.
Misalignment and Belt Monitoring Switches
DUK offers robust misalignment detection devices for conveyor belts:
- LHR Series Off-Track Switch: Cast-iron or BMC housing, double-bearing roller lever, IP65 protection, snap-action contacts, available with 2-stage warning and shutdown options.
- LHPE Series (ATEX Zone 22): Cast-iron or polyester construction, Ex tc IIIC Dc IP67, suitable for explosive dust environments with positive-opening contacts.
Pullcord (Rope) Emergency Switches
Pullcord switches enable manual shutdown across conveyor lengths:
- Steel or polyester housing with IP67 sealing.
- Up to 4 NC and 4 NO snap-action contacts.
- Available in ATEX-certified versions (zones 21 and 1) with large pull-travel and force-balanced design.
Limit and Speed Control Switches
DUK manufactures a variety of rugged precision switches:
- Lever Limit Switches (LHP, LHS, OH): Designed for linear or swivel applications in cranes, stage machinery, and conveyor systems, with stainless shafts and high IP ratings.
- Geared Limit Switches: Configurable cam systems with adjustable switching angles.
- Speed Control Units: Shaft-based sensors for zero-speed, under-speed, and overspeed detection.
Tilt and Scratch Detection Sensors
Specialty sensors for material and equipment safety:
- Pendulum/Tilt Switches (BS2): Stainless steel, mercury-free, IP69K, tilt threshold at approx. 22°, for bin high-level or chute blockage detection.
- Scratch Switches (LHPE-10/1): Detect belt edge damage and prompt shutdown at early stages.
Certifications and Global Reach
DUK products are fully manufactured in Germany, ISO 9001 certified, and meet international standards including ATEX, mining certifications, CE, and RoHS. Their industrial solutions are deployed worldwide across mining operations, port facilities, cranes, conveyor systems, and flood control infrastructure.
Conclusion
DUK continues to lead in industrial switchgear with its range of custom-engineered misalignment, pullcord, limit, speed, and tilt safety devices. Known for durability, precision, and compliance with global safety standards, the brand is trusted by OEMs and system integrators in the harshest industrial environments.