For a safer and more efficient work environment give your machine guard, gate, or door an upgrade with the 440K Elf Miniature Safety-Rated Tongue Interlock Switch by Allen Bradley Guardmaster.

This space-saving, cost-effective safety switch is specifically designed for use with smaller machinery such as printers, copiers, and domestic machinery due to its unique miniature housing. It is the smallest in the industry at only 75mm x 25mm x 29mm and is designed to be fitted at the leading edge of hinge, sliding, and lift-off guards.

The 440K door interlocks provide reliable and secure electrical interlocking of the guard door to the machine’s control circuit. It can be operated by the insertion of a specially profiled key which is permanently fixed to the safety barrier. This switch has a conveniently rotatable head with dual entry slots, and can offer up to 8 different key entry points for optimal flexibility.

The 440K-E33040 has Break Before Make Action and 1NC/1NO Contacts. It has M16 conduit entry (or quick disconnect). It provides excellent durability as it is made of UL approved glass-filled PBT the actuator is stainless-steel. Actuator type is 90°. It has an operating temperature range of -20 to +80 °C (-4…+176 °F). This tongue interlock switch is environmentally sealed to IP67, ensuring that it is both water-tight and dust-tight.

• Miniature size - the smallest interlock switch available
• Perfectly suited for use with small, lightweight guards, particularly useful for light duty sliding and small radii hinged machine guards (60mm or 2.36in) due to semi-flexible key
• Easy to install and rotatable head with dual entry allows up to 8 options for actuator entry position
• Forced guided contacts
• Environmentally sealed to IP67 – no ingress of dust and water-tight

EN954-1
ISO13849-1
IEC/EN60204-1
NFPA79, EN1088
ISO14119
IEC/ EN60947-5-1
ANSI B11.19
AS4024.1
IP67 rated
UL approved
CE certified

A safety interlock switch is a device which keeps guard doors and gates securely locked to prevent access to areas where dangerous machinery may be in operation, minimalising the risk of injury to personnel and damage to machinery. They can also be used to monitor the status of the machine guard, and to ensure that machinery cannot start up or run while the guard door is open. They are often utilised in industrial settings, such as safeguarding factory production lines. They can vary in lock type, maximum current and voltage, and housing material. Safety-rated interlock switches are specifically designed to meet high machine safety standards. Allen Bradley Guardmaster switches are built to global standards to provide exceptional quality and reliability.