Allen-Bradley 440K-E33080 Guardmaster Elf Miniature Tongue Interlock Switch

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.