Siemens 3SB3921-0AK Protective Collar

Product Description

The SIEMENS 3SB3921-0AK is a protective collar designed to guard pushbutton and selector switch operator assemblies in industrial control panel applications. This accessory mounts around the operator head to provide mechanical protection against accidental actuation and physical damage to the switch body. Electricians and control panel technicians install this collar as part of a complete operator assembly. At 0.143 pounds and measuring 3.740 inches by 3.071 inches by 2.953 inches, it is a compact, lightweight component that integrates directly with compatible 3SB-series operator hardware.

This protective collar is suited for use in industrial and commercial control panel environments where pushbutton operators require additional mechanical guarding. Typical installations include motor control centers, machine control panels, and operator interface stations where accidental contact with adjacent controls must be minimized. It is installed as part of a layered operator assembly during panel construction or field retrofit.

Key Features

• Provides mechanical protection against accidental actuation of pushbutton and selector switch operators
• Lightweight construction at 0.143 pounds for easy integration into operator assemblies
• Compact footprint measuring 3.740 inches by 3.071 inches by 2.953 inches
• Designed for use with 3SB-series operator hardware
• Suitable for industrial and commercial control panel applications

Compatibility

Designed as an OEM-style accessory collar for use with Siemens 3SB-series pushbutton and selector switch operator assemblies in industrial control panel installations.

Installation Notes

Installation is typically performed by a licensed electrician or qualified control panel technician. De-energize and lockout/tagout the control panel before servicing any operator components, in accordance with NFPA 70E safe work practices. The collar should be seated fully around the operator head before securing the assembly to the panel cutout. Do not force-fit the collar onto incompatible operator heads, as this may damage the mounting threads or protective function.

Technical Specifications

• Weight: 0.143 pounds
• Length: 3.740 inches
• Width: 3.071 inches
• Height: 2.953 inches
• UPC: 75455439548

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 3SB3921-0AK