Relay,Solid State 120 Volt SVCE
          (427R,511,532,542,550,561,590)
    427R  Use Starting with Serial #1944319.
          Prior to Serial #1944319, see 4203420.
  ICB427R See 7014393
    511   Use from Serial #M964470 to #M964769 and
          Starting with Serial #1004775.
    532   Use from Serial #M964770 to #M965069, &
          from Serial #M990700 to #M990999, and
          Starting with Serial #1004775.
    542   Use Regardless of Serial Number.
    550   Use from Serial #M964070 to #M964469, &
          from Serial #M984750 to #M985149, and
          Starting with Serial #1004775.
    561   Use from Serial #M965470 to #M965869 and
          Starting with Serial #1004775.
    590   Use from Serial #M965870 to #M966269 and
          Starting with Serial #1004775.