Accepts Cole Hersee Heavy duty relays Form A (SPST) or Form C (SPDT) and standard ISO relays. Modular – sockets dovetail together. Accepts standard quick-connect terminals. Easy mount bracket. Constructed of rugged glass-filled polyamide. Temperature range -40F to 85C. Use with Tyco (AMP) terminals 42281 or Ark-Les 3000H112A series.