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OSHA Hazard Information Bulletins1
Telemecanique D11SF4 Rotary Handle and D11SH10, D11SH16 Shaft Kits used with
Telemecanique D10 Disconnect Switches

July 29, 1994




  • Acting Director
  • Directorate of Technical Support


  • Hazard Information Bulletin1: Telemecanique D11SF4 Rotary Handle and D11SH10, D11SH16 Shaft Kits used with Telemecanique D10 Disconnect Switches

The Consumer Product Safety Commission forwarded to the Occupational Safety and Health Administration information regarding a potential hazard associated with the rotary handle and shaft kits referenced above, manufactured by the French company, Telemecanique Inc., from 1989 through 1992. Telemecanique Inc. is part of the Square D Company.

These kits are used in a variety of industrial and commercial electrical applications. In one application, the rotary handle and shaft kits are used as one unit with Telemecanique D10 disconnect switches in mechanical equipment rooms in schools, commercial buildings, hospitals, and other industrial facilities.

The Telemecanique D11SF4 rotary handle kit consists of an operating lever that can be mounted on the face of an electrical panel box. The lever is secured to a shaft passing through the front of the box and attached to a cam. As the lever is rotated, the cam engages or disengages the internal activating mechanism. A part called a "bullet" is attached to the end of the operating shaft by a set screw which holds the "bullet" in place. The "bullet" may become loose causing it to slide down the operating shaft. This condition would allow the handle to be rotated without the corresponding rotation of the internal activating mechanism. Should this occur, an operator could turn the handle to the "OFF" position without deenergizing the controlling machinery, posing a hazard to service and maintenance workers. Another possible hazardous condition exists if the rotary handle is the sole means of holding the door closed. The electrical panel box door may drift open when the rotary handle is in the "ON" position exposing workers to energized parts.

Square D has issued a detailed product safety notice in July, 1993 to its known customers. The product safety notice includes model/part numbers and drawings to identify the problem rotary handle. It also includes warnings and necessary corrective actions.

Since the rotary handles are used by maintenance and service workers, 29 CFR 1910.147, the control of hazardous energy (Lockout/Tagout) standard, applies. The employer must establish an energy control program as specified in 29 CFR 1910.147(c). The energy control program shall provide full employee protection as set forth in 29 CFR 1910.147(c)(3).

Please distribute this bulletin to all Area Offices, State Plan States, Consultation Project Officers, and appropriate local labor and industry groups.

1 The Directorate of Technical Support issues Hazard Information Bulletins (HIB) in accordance with OSHA Instruction CPL 2.65 to provide relevant information regarding unrecognized or misunderstood health hazards, inadequacies of materials, devices, techniques, and safety engineering controls. HIBs are initiated based on information provided by the field staff, studies, reports and concerns expressed by safety and health professionals, employers, and the public. Bulletins are developed based on a thorough evaluation of available facts and in co-ordination with appropriate parties.

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