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6. S A F E T Y STA N D A R D S
6.1 U L APPRO VED (U L I 577: OPTICAL ISOLATORS)
UL File No. E72422(S) ·PS2501-1 to 4 ·PS2502-1 to 4 ·PS2503-1 to 4 ·PS2505-1 to 4 ·PS2506-1 to 4 ·PS2521-1 to 4 ·PS2