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GE 9T21J1701

Product Name:​ GE Mark V 8-Channel Relay Output Module
Product Introduction:​ The GE 9T21J1701 is a Mark V discrete output module converting TTL logic to 8 isolated dry-contact relays for solenoids, alarms, and interposing coils.
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Detailed content

Technical Specifications:
  • Relays: 8 Form-C, 5 A @ 30 V DC / 250 V AC
  • Input: 5 V backplane logic
  • Suppression: Built-in flyback diode
  • Hot-swap: Supported in most Mark V racks
  • Temp: 0 °C to +60 °C
    Functional Features:​ LED per channel; pluggable terminal; TMR-safe; wire-break invisible but coil LED shows drive.
    Materials & Structure:​ FR-4, sealed telecom relays, gold logic pins.
    Working Principle:​ Backplane logic turns on opto-isolator → transistor energizes relay coil → contact transfers field load.
    Installation Requirements:​ Seat in Mark V DO slot; flyback diode side must face DC coil load; isolate AC from DC terminals.
    Precautions:​ 5 A is resistive—derate for inductive; never land 480 V on same block as 24 V wiring; replace whole module if one relay welds.

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