440G-T27121

The Allen-Bradley 440G-T27121 is a solenoid interlock safety switch designed for the safety of machine guard doors and operating personnel. The switch has a supply voltage of 24 volts AC/DC, a thermal current of 10 amperes, and a rated insulation voltage of 500 volts. The switch allows power to unlock and an M20 conduit entry. It features 1 normally open (N.O.) and 1 normally closed (N.C.) solenoid contacts, as well as 2 normally closed safety contacts and 1 normally open auxiliary contact.

The 440G-T27121 switch has an operating temperature of -20 to 60 °C (-4 to 140 °F). It is housed in a package (126 x 33 x 86 mm) composed of UL approved glass-filled PBT and has a built-in stainless-steel actuator guide to protect the actuator from damage due to prolonged usage and poor gate alignment. The enclosure is also IP67 rated enabling protection from dust and water. The switch can be used with a variety of doors (hinge, sliding, lift-off) and is suitable for use with PLCs. Additional features of the guard switch include a high locking force of 2 kN (450 lb), rotatable head with two entry slots, four actuator entry positions, five 2 NC and 1 NO contacts for door position monitoring, 1 NC and 1 NO contacts for lock monitoring, built-in blanking plug, three manual release points fitted with security screws, and indicators for lid mount status.

This 440G-T27121 is a tongue operated, positive mode interlock switch that safeguards machinery enclosures when they are in motion and isolates power while the guard doors are open. The switch lowers the risk of personnel entry into a hazardous area and is ideal for use with machinery that does not stop instantly or is prone to damage if interfered while working. The switch is equipped with power to unlock functionality which implies that interlock mechanism is released and the safety barrier is opened only when an external signal is applied.