Product Overview Solenoid Interlock Safety Switch 440G-T27121 Allen Bradley Guardmaster Power to unlock. Five contacts: 2 NC & 1 NO for door position monitoring 1 NC & 1 NO or 2 NC for lock monitoring. 24VAC/DC M20 electrical terminal. 440GT27121Made in Dominican RepublicNew item in original packaging Reviews (No reviews yet) Write a Review