NSR55-BM-EX Belt Misalignment Switch

  • Aluminium Casting Body
  • ATEX Certified for Dangerous Environment
  • 2NO / 2NC Contact Structure
  • CE, EAC Standards
  • 3 Years Replacement Warranty
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NSR55-BM-EX Belt Misalignment Switch

NSR55-BM-EX Belt Misalignment Switches are designed to alarm and/or shut down a conveyor system in the event of belt drift and misalignment in hazardous environments where explosions could occur. They are mounted on both sides of the conveyor belt, with roller arm of the switch positioned 15 cm away from the belt. As the belt starts drifting into either side, it will first contact with the switch arm. Arm will roll without distrupting the belt. If belt continues to drift further the switch arm will rotate and actuate microswitches at specified angles.

The product is suitable for reliable long term usage in most industrial applications due to its durable design. Anti-static powder coated aluminium cast enclosure is resistant to corrosion. Shaft and arm mechanisms are made of stainless steel and all internal parts are metal cast. NSR55-BM-EX series products do not require any maintenance.

The switch arm actuates the alarm switch at 15° angle. If the belt continues to drift and the switch arm rotates until 18°, the second microswitch will be actuated and the system will stop. Can be customized with both switches working at the same angle.

NSR55-BM-EX is Ex-Proof (ATEX  certified). With its protection against dust ingress, it is reliable in explosive athmosphere. All models conform to CE (European Union) and EAC (Eurasian Customs Union) standards. Microswitches used in these products are VDE approved

Technical Specifications

Enclosure Aluminium Casting
Micro Switch Rating 240 V 3A
Output Signal (2) SPDT Alarm and Stop
Cable Gland PG13,5
Temperature Rating -30°C to +85°C
Contact Angles 15° and 18°
Max. Contact Angle -90° / 90°
Protection Class IP65
Enclosure Color Black (RAL 9005)
Weight 1.15 Kg
Mounting Orientation It is suitable for double-sided use.
Mechanical Endurance 300000 cycles
Impact Rating IK09 (EN 62262)
Warranty Period 24 Months

Safety Standards

Electrical Safety EN 60947
Mechanical Safety EN 60204
Outdoor Safety EN 60529
Impact Resistance EN 62262
Certificates CE, EAC
Micro switches are VDE approved.


Bus Security Interface
Custom Contact Angles
Mounting Bracket
Custom Arm Dimensions

EX Definition

II 2D Ex tb IIIC Db T85°C    IP66/68 

Model Specifications

Model Alarm Stop
NC NO Angle NC NO Angle
NSR55-BM-EX 1 1 15° 1 1 18°