Overview
The Allen-Bradley 440K-C21054 Guardmaster Cadet 3 Tongue Interlock Switch is a safety-rated device engineered for machine guard applications where reliable operator protection is critical. Cadet 3 tongue interlock switches are tongue- or key-operated safety interlock switches that fit at the leading edge of sliding, hinged or lift-off guards. This model meets ISO 14119 machine safety standards and integrates into Guardmaster safety systems for predictable, fail-safe performance.
Key Features
- Dual entry slots and rotatable head offer up to eight different actuator entry options
- 2 N.C. safety contacts and 1 N.O. auxiliary contact with M12 6-pin micro quick-disconnect connection
- Break-before-make contact action for safe switching sequence
- Compact housing is 90.5 × 31 × 30.4 mm (3.56 × 1.22 × 1.19 in.)
- PBT plastic construction for durability in industrial environments
Technical Specifications
The 440K-C21054 meets demanding electrical and mechanical requirements typical of modern machine guarding:
- Contact rating: 600 VAC at 1.2 A, 500 VAC at 1.4 A, 240 VAC at 3 A, 120 VAC at 6 A, 24 VDC at 2 A
- Current draw: 5 mA at 5 VDC
- Contact configuration: 2 N.C. safety, 1 N.O. auxiliary with break-before-make contact action
- Actuator type: Flat tongue
- Material: PBT thermoplastic
Typical Applications
This interlock switch is ideal for:
- Machine press and punch guard interlocking
- Injection molding machine safety gates
- Packaging machinery guard protection
- Industrial automation equipment access doors
- Conveyors and material handling systems with movable guards
Compatibility & Replacements
The 440K-C21054 is part of the Rockwell Automation Guardmaster family and is compatible with Guardmaster safety controllers and integrated safety systems. It operates as a direct replacement within the 440K Cadet 3 series. The product family includes catalog numbers 440K-C21048 through 440K-C21098, which share common wiring practices but differ in contact configuration and actuator type. For system integration or replacement guidance, consult the Guardmaster literature library or contact Rockwell Automation technical support.
