TDR, time delay 30 seconds 5VAC/DC, SPDT-3A.
Edison B1624 Model 501 3380-705224-2715
Relay. TDR, time delay 30 seconds 5VAC/DC, SPDT-3A. Product of Instrument Division of Thomas A Edison Inc. Package: thermostatic glass tube. Mount: octal plug-in. Military NSN 3380-705224-2715.