Invensys CC-8104-0-0-1 Four Step Sequence Controller Solid State, 24V 50/60Hz BNIB / NOS

<p>Electronic four-step sequence controller operates up to four external AC power handling relays or loads in heating, ventilating, and air conditioning systems.&#160; A second unit can be sequenced to provide up to eight steps.</p><p>&#160;</p>