When I installed it, the RELAY AND CONTROL label matched my older gear, which made setup much smoother.
Relay Service Co. 999KUE Relay, 3PDT, 24VDC Coil, Contacts: 120VAC 28VDC SP167
Because it says RELAY AND CONTROL, I can pair it with older units without worrying about mismatched parts.
You will find that with RELAY AND CONTROL, the part numbers stay logical across different models and sizes.