GE DS3800NVRC

Key Parameters

• Output Channels: 16 independent form-C (SPDT) relay outputs

• Contact Rating: 5A at 250V AC / 30V DC (resistive load)

• Coil Voltage: 24V DC from backplane

• Isolation: 2500V RMS coil-to-contact, 1500V RMS channel-to-channel

• Diagnostics: Coil status LED per channel, fuse status indication

• Mechanical Life: >10 million operations

• Electrical Life: >100,000 operations at rated load

• Temp Range: –30°C to +70°C

• Power Supply: +5V (logic), +24V (relay coils) from backplane

• Physical: 6U VME single-slot board

Advantages

• High current capability – 5A contacts can directly drive most solenoid valves and alarm devices without external interposing relays.

• Form-C contacts – provides both NO and NC outputs per channel for flexible wiring (fail-safe or non-fail-safe configurations).

• Full isolation – channel-to-channel and coil-to-contact isolation prevents noise coupling and ground loops.

• Visual status indication – individual LEDs show coil energization for quick troubleshooting.

• Fused outputs – each channel has a replaceable fuse to protect against field wiring shorts.

• Drop-in compatible – works with all Mark IV processor and I/O boards.

Applications

• Turbine trip and shutdown – drives emergency stop solenoid valves for fuel, steam, and lube oil.

• Alarm annunciation – activates panel lamps, horns, and DCS alarm inputs.

• Motor control – starts/stops auxiliary pumps, fans, and cooling water valves.

• Valve actuation – controls on/off isolation valves and purge valves.

• Generator breaker control – initiates trip and close commands to the main generator circuit breaker.

vs Competitors & Related Variants

Selection Tips

• Load verification – confirm the inrush current of solenoid valves does not exceed the 5A rating of the DS3800NVRC; use an external contactor for higher loads.

• Fail-safe wiring – use the NC contact for critical trip circuits so that the valve actuates on power loss or board removal.

• Fuse replacement – stock spare fuses (specification: 5A slow-blow, 250V) for each General Electric DS3800NVRC installed.

• Channel mapping – verify that the main processor is configured to send the correct output commands to the DS3800NVRC; incorrect mapping can cause unintended operations.

• Spare strategy – keep one DS3800NVRC per 5 installed units; relay contacts wear out over time, especially under inductive loads.

Critical Precautions

• Inductive loads – always install a flyback diode (for DC loads) or RC snubber (for AC loads) across solenoid coils to prevent voltage spikes from damaging the DS3800NVRC relay contacts.

• Fuse rating – do not exceed the specified fuse rating; using a higher-rated fuse can result in PCB trace damage during a short circuit.

• Wiring inspection – check for shorts in field wiring before energizing the DS3800NVRC; a short can blow the fuse or weld the contacts.

• Contact wear – for high-cycle applications (frequent switching), consider using an external solid-state relay to extend the life of the DS3800NVRC contacts.

• Hot-swap – never insert or remove the General Electric DS3800NVRC while the rack is powered; relay coils may latch unexpectedly.

• Grounding – use separate grounding for the relay common and the logic ground to avoid noise coupling into the backplane.

• Storage – store spare DS3800NVRC boards in anti-static bags in a dry, temperature-controlled environment to prevent contact oxidation.