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A-B 440T-MSSLE100B Guardmaster Trapped-Key Interlock Switch

Product Overview

The Allen-Bradley Guardmaster 440T-MSSLE100B is a mechanical trapped-key interlock switch designed to help protect personnel during access to hazardous machinery. It uses a slamlock mechanism with a single coded key. The key remains trapped until the actuator is released, helping enforce a controlled access sequence. Its stainless-steel construction is suitable for demanding industrial environments.

Key Technical Specifications

Parameter	Specification
Brand	Allen-Bradley (A-B)
Model	440T-MSSLE100B
Product Series	Guardmaster 440T
Product Type	Mechanical Trapped-Key Interlock Switch
Mechanism	Slamlock
Key Configuration	Single key
Key Coding	Standard key code, code B
Key Operation	Key trapped to release actuator
Housing Material	316L stainless steel
Maximum Holding Force	2000 N
Mechanical Life	200,000 operations
Mounting	M5 fasteners
Dimensions (H × W × D)	Approx. 93 × 48 × 34 mm
Weight	Approx. 0.76 kg
Operating Temperature	Manufacturer lists minimum operating temperature of −40°C
Lifecycle Status	Active

Specifications are based on Rockwell Automation's official product information.

Features and Advantages

Trapped-key safety design: Helps control access to hazardous machinery.
Mechanical interlocking: Operates without electrical power for the locking mechanism.
Slamlock mechanism: Supports guard or access-door interlocking.
316L stainless-steel construction: Provides corrosion resistance in industrial environments.
Coded key: Helps prevent operation with an incorrect key.
Durable construction: Rated for up to 200,000 mechanical operations.

Typical Applications

Machine guarding and access doors
Industrial manufacturing equipment
Packaging and processing machinery
Hazardous-area access control
Maintenance and machine isolation procedures

Important Notes

Rockwell Automation lists this model as Active.

US
This is a mechanical interlock device; it does not by itself guarantee that machinery is electrically isolated or has stopped moving.
Confirm the key code, actuator configuration, mounting dimensions, and safety-system design before installation.
Follow the manufacturer's installation instructions and applicable machine-safety requirements.