The model PSR-SCP-24UC/ESA4/2X1/1X2 2963750 is listed clearly, and you will find that it fits many control panels with ease.
2 Takamisawa / Fujitsu NA4.5W-K 4.5V 2Pole 2A Signal Relays FormC
What stands out about the WD3556 is that it's simple to locate in a crowded panel.