1SFA611284R3001 ABB M3SSK2-301 3-Position Maintained Key Selector Switch

Why Choose the ABB M3SSK2-301 Key Selector Switch?

The ABB M3SSK2-301 is a three-position maintained key selector switch from ABB's modular pilot-device range, designed for industrial machinery, control panels and automation systems. Its key-operated interface provides deliberate selection between three operating states where controlled access to machine or process functions is required.

This exact M3SSK2-301 configuration uses key code 455 and permits the key to be removed in position B only. All three selector positions are maintained, with no spring return, so the selected operating state remains mechanically set until the operator deliberately changes the key position.

Designed for standard 22 mm panel mounting, the M3SSK2-301 combines a black key-operated actuator with a chrome-metal front ring, non-illuminated construction and IP66 front protection. It is supplied without a contact block, allowing compatible ABB modular contact blocks to be selected according to the required electrical switching arrangement.

Key Advantages

• Three-position maintained operation provides stable selection between three machine or process states.
• Key code 455 provides a defined key-operated configuration.
• Key can be removed in position B only for controlled key-retention behaviour.
• Chrome-metal front ring provides a durable industrial operator-panel finish.
• IP66 front protection and NEMA Type 4X protection support demanding industrial environments.
• ABB modular construction allows compatible contact blocks to be selected for the required control circuit.

Key Features

• ABB M3SSK2-301 key selector switch.
• Three-position operation.
• Maintained/latching switching function.
• No spring return.
• Key code 455.
• Key removable in position B only.
• Black key-operated actuator.
• Chrome-metal front ring.
• Non-illuminated construction.
• 22 mm mounting-hole diameter.
• IP66 front protection.
• NEMA Type 4X protection.

Controlled Three-Position Selection for Industrial Machinery

Three-position key selector switches provide a deliberate operator interface for machinery and processes requiring controlled selection between multiple operating states. The ABB M3SSK2-301 uses a maintained latching mechanism without spring return, so the selected position remains mechanically set until the operator intentionally moves the selector.

The M3SSK2-301 uses ABB's 455 key code and permits key removal in position B only, keeping the key captured while either alternative operating state is selected. Combined with its chrome-metal front ring and modular contact-block architecture, it is well suited to machine-mode, process and function-selection applications.

Typical Applications

• Industrial machinery control panels.
• Key-controlled machine mode selection.
• Operator control stations and consoles.
• Three-state process and function selection.
• Controlled enable and operating-mode functions.
• Production and manufacturing equipment.
• Material handling and conveyor control systems.
• OEM machinery and electrical control assemblies.