A-B 440K-T11118 Safety Switch

Allen-Bradley 440K-T11118 Guardmaster Safety Interlock Switch

 

 

The Allen-Bradley 440K-T11118 is a Guardmaster Trojan 5 safety interlock switch used on machine safety guards and doors. It ensures that hazardous machinery cannot operate while a guard door is open, and it is a key part of industrial safety circuit systems (E-Stop / guard interlock protection).

It is a mechanical safety switch with tongue/key actuator, widely used in OEM machines and industrial safety protection systems.

Key Specifications

• Model: 440K-T11118
• Series: Guardmaster Trojan 5 (440K series)
• Brand: Allen-Bradley (Rockwell Automation)
• Type: Safety Interlock Switch (tongue/key operated)
• Contact Configuration:
  • 2 × NC safety contacts
  • 1 × NO auxiliary contact
• Switch Action: Make Before Break (MBB)
• Rated Voltage: up to 300V AC
• Rated Current: up to 6A AC-15
• Protection Rating: IP67 (dust/water resistant)
• Operating Temperature: −20°C to +80°C
• Housing Material: Glass-filled PBT (industrial reinforced plastic)
• Cable Entry: M20 conduit entry
• Actuator: Standard stainless-steel tongue key included

What it does (simple explanation)

Machine Guard Door
↓
440K-T11118 Safety Switch
↓
Safety circuit (relay / safety PLC / CR30)
↓
Machine stops safely if door opens

It physically detects whether a safety guard is closed or open.

Main Functions

• Detects safety guard door position (open/closed)
• Prevents machine operation when guard is open
• Sends safety signal to relay or safety controller
• Supports forced-guided safety contacts
• Improves machine operator protection

Key Features

• 3-contact design (2NC safety + 1NO monitoring)
• Tamper-resistant tongue key system
• High mechanical durability for industrial environments
• IP67 protection for harsh conditions
• Rotatable head (flexible installation options)
• Suitable for safety-rated circuits (ISO 13849 / IEC standards)

Applications

• Machine safety doors and guards
• CNC machines
• Packaging equipment
• Conveyor safety gates
• Robotics safety fencing
• Press machines
• Industrial automation systems