The Allen-Bradley 440K-E33080 Guardmaster Elf Miniature Tongue Interlock Switch is a compact safety interlock engineered for machine guarding applications in space-constrained environments. This Type 2 interlocking device prevents machinery operation when access points, guards, or doors are open, protecting personnel through direct opening action and dual normally closed safety contacts. Built from glass-filled PBT with a stainless steel actuator, the switch delivers IP67 ingress protection and operates across industrial temperature ranges.
Technical Specifications
Electrical Performance:
• Maximum voltage rating: 600V AC / 600V DC
• Thermal current (Ith): 5 A (standard) / 10 A (A600 configuration)
• Rated insulation voltage (Ui): 2500V / 500V
• Minimum switching current: 3 mA @ 18V DC; 5 mA @ 5V DC
• AC utilization category A600/AC-15 at 600V: 1.2 A; 500V: 1.4 A; 240V: 3.0 A; 120V: 6.0 A
• DC utilization category N600/DC-13 at 600V: 0.4 A; 500V: 0.55 A; 250V: 1.1 A; 125V: 2.2 A
• DC-13 (24V): rated per specifications
Physical Dimensions:
• Length: 75 mm (2.95 in.); Width: 25 mm (0.98 in.); Depth: 29 mm (1.14 in.)
• Weight: approximately 60 g (2.11 oz)
• Operating temperature: -20°C to +80°C
• Enclosure rating: IP67
Mechanical Operation:
• Actuator type: flat tongue with stainless steel construction
• Contact configuration: 2 normally closed (NC) safety contacts or configurable as 1 NO + 1 NC
• Auxiliary contacts: 1 NO option available
• Eight actuator entry points with rotatable dual-entry head
• Maximum actuation speed: 160 mm/s (6.29 in./s)
• Maximum actuation frequency: 2 cycles/s
• Minimum operating radius: 150 mm (5.9 in.); 60 mm with GD2 kit
– Key Features
• Direct opening action ensures fail-safe engagement
• Glass-filled PBT housing with stainless steel actuator provides durability
• Eight entry options accommodate flexible mounting configurations
• Certification across ISO 14119, IEC 60947-5-1, EN954-1, ISO 13849-1, NFPA79, and ANSI B11.19
• c-UL-us Listed, TÜV Certified, CE Marked, with CCC, KC, UL approvals
– Typical Applications
Machine access guard interlocking on presses, injection molding machines, and automated assembly equipment where compact form factors and high reliability are required.
– Compatibility & Integration
M16 conduit entry; connector options include M16, 1/2 inch NPT, 4-pin Micro (M12), and 5-pin Micro (M12). Standard cable lengths: 2 m, 5 m, or 10 m.
