Industrial FR-102 Relay

ALCO FR-102 Relay is a compact isolating relay from ALCO Controls designed to switch AC loads with a 117 VAC coil. This SPDT (single-pole double-throw) device provides one common contact with normally open and normally closed outputs, enabling clean signal control and electrical isolation between the control circuit and the load. Rated for up to 6 amps, it handles typical low-to-mid power applications in industrial control panels and signaling circuits. The coil is specified for 117 VAC operation, compatible with standard line-voltage control circuits, while the contacts are intended for general-purpose AC switching. The FR-102 has a long history in vintage and legacy equipment, referenced as a standalone isolating relay in Allied/Lafayette-era schematics and control panels. There are FR-102 variants in the family that use different coil voltages, including a 220 VAC coil variant, reflecting regional electrical standards. The FR-102 is listed as discontinued by the manufacturer, so current availability generally comes from surplus or third-party distributors. This makes it a suitable option for replacing or tracing legacy ALCO controls in older equipment, or for projects requiring a like-for-like SPDT, 6 A, 117 VAC form factor with classic ALCO switching heritage.