UR8HH is a “digital-only” plug-in for GE Multilin UR relays: eight inputs or outputs that switch in <0.25 ms. Use it for breaker-fail, arc-flash trip, lock-out or high-speed interlocking—without stealing extra panel space.
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Mode (jumper-free)
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Typical signal
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Timing
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On-board protection
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8 DI, 24–250 Vdc
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Breaker 52a
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0.1 ms
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2 kV optical isolation
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4 DI + 4 DO
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Trip + seal-in
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0.2 ms
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Dry contact 8 A, NO/NC
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8 DO (high-side)
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Lock-out coil
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0.25 ms
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Varistor clamp 1.5 J
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· Pick-up 18 Vdc, drop-off 5 Vdc; burden <0.2 W per DI
· Output contact: 8 A continuous, 30 A make-for-100 ms (L/R=40 ms)
· Scan synchronized to UR ¼-cycle task → deterministic 2.08 ms @60 Hz
· SOE resolution 1 ms; time-stamp via IRIG-B or PTP to 0.1 ms
· Operating range –40 °C…+85 °C, 5…95 % RH non-condensing
· 3 kV RMS isolation to station ground; surge 4 kV IEC 61000-4-5
1.Loop-power harvesting: board steals 20 mA from the DI line—no external 24 V supply needed.
2.Dual-polarity outputs: software-selectable high-side or low-side; reverse-battery safe.
3.Auto pulse stretch: if your lock-out coil needs 50 ms but the CPU task is only 8 ms, UR8HH stretches the pulse in hardware—zero code change.
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Host relay
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UR8HH slot
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Job
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Pay-off
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F650
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Slot 3
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Arc-flash fast trip <2 ms
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Cuts switch-gear cost by 30 %
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L90
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Slot 5
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Breaker-fail initiate
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Meets IEEE 1547 160-ms window
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B90
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Slot 2
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Bay-to-bay blocking
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Saves copper vs. hard-wire
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Email title “UR8HH qty + host relay” → ab@mooreplc.com (May)
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Your quote
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