Date Code 20011026 Preface Preface-1
SEL-321/321-1 Instruction Manual
PREFACE
This manual applies to multiple versions of the SEL-321 and SEL-321-1 Relays (designed to
operate with nominal system frequencies of 50 Hz and 60 Hz). Except when specific differences
are noted, all specifications and data apply equally to all versions of the relay.
SEL-321 RELAY VS SEL-321-1 RELAY
Throughout this manual where there are differences between the SEL-321 Relay and the
SEL-321-1 Relay the headings of those sections that apply strictly to the SEL-321-1 Relay
include the following statement:
(SEL-321-1 Relay Only)
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