The ALLEN BRADLEY 440G-T21BGPM-1B is a GUARDLOCK safety switch featuring TLS-GD2 standard with escape release mechanism. It operates at 24V AC/DC and includes 1 normally closed (N.C.) contact, 1 normally open (N.O.) contact, plus 2 N.C. safety contacts and 1 N.O. auxiliary contact with break-before-make functionality. The switch has M20 conduit entry and plastic housing. Note: Factory warranty does not apply, but this unit comes with Radwell's 2-year warranty.