The 1423157-9 is an AGASTAT 7000 series on-delay (delay on pick-up) electropneumatic timing relay, corresponding to model 7012AC. This unit operates with a 120V 60Hz coil and features a linearly adjustable timing range from 1.5 to 15 seconds, set via an oversized knob. It is constructed with a DPDT snap-action switch assembly, a precision-wound potted coil, and a patented timing head. The modular design, with clearly identified screw terminals on the face, facilitates easy installation and field replacement of switches, making it suitable for various industrial control applications requiring reliable timed delays.