GE DS3800NVRC1C1C

Key Parameters

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

• Relay Type: Hermetically sealed (gas-filled) for contamination-free operation

• Contact Material: Gold-plated (optimized for dry-circuit and power loads)

• Contact Rating: 5A at 250V AC / 30V DC (resistive); 0.1A at 5V DC (dry-circuit)

• 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: >50 million operations

• Electrical Life: >200,000 operations at rated load

• Temp Range: –40°C to +85°C (extended)

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

• Physical: 6U VME single-slot board

• Key Variant Features: Hermetically sealed relays, extended temp range, gold-plated contacts, enhanced coil suppression, conformal coating

Advantages

• Hermetically sealed relays – the DS3800NVRC1C1C uses gas-filled relays that are immune to dust, humidity, and corrosive atmospheres, making them ideal for offshore, desert, or chemical environments.

• Gold-plated contacts – ensures reliable operation for both high-current and low-current (dry-circuit) applications; no contact oxidation over time.

• Extended temperature range – operates reliably from –40°C to +85°C, surpassing standard Mark IV boards.

• Enhanced coil suppression – internal flyback diodes and snubbers reduce voltage spikes, extending relay and driver life significantly.

• Conformal coating – the PCB is coated to protect against moisture, salt spray, and airborne contaminants.

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

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

Applications

• Critical turbine trip circuits – drives emergency stop solenoid valves for fuel, steam, and lube oil in safety-critical applications (SIL-2 rated).

• Offshore platforms – the General Electric DS3800NVRC1C1C is specifically suited for saltwater environments where corrosion is a concern.

• Desert installations – sealed relays prevent sand and dust ingress.

• Alarm annunciation – activates panel lamps, horns, and DCS alarm inputs (including dry-contact PLC inputs).

• Generator breaker control – initiates trip and close commands with high reliability.

• Harsh industrial environments – chemical plants, pulp and paper mills, and cement factories benefit from the sealed relay design.

vs Competitors & Previous Variants

Selection Tips

• Harsh environments – choose the DS3800NVRC1C1C over the standard DS3800NVRC or DS3800NVRC1A if your site has high humidity, salt spray, dust, or corrosive gases.

• Critical safety circuits – for SIL-2 rated trip circuits, the hermetically sealed relays of the General Electric DS3800NVRC1C1C provide the highest reliability and contact stability.

• Dry-circuit applications – the gold-plated contacts are ideal for low-current signals (e.g., 5V DC logic inputs to PLCs or DCS).

• Load verification – confirm the inrush current of solenoid valves does not exceed the 5A rating of the DS3800NVRC1C1C; 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 DS3800NVRC1C1C installed.

• Spare strategy – keep one DS3800NVRC1C1C per 8–10 installed units; the sealed relays have a longer life, reducing spare requirements.

Critical Precautions

• Inductive loads – despite enhanced internal suppression, always install a flyback diode (for DC loads) or RC snubber (for AC loads) across solenoid coils for additional protection of the DS3800NVRC1C1C contacts.

• Fuse rating – do not exceed the specified 5A 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 DS3800NVRC1C1C; a short can blow the fuse or weld the contacts.

• Gold contact sensitivity – do not use contact cleaners or lubricants on the relay contacts; the gold plating is thin and can be easily damaged.

• Sealed relay integrity – do not attempt to open or repair the hermetically sealed relays; replace the entire General Electric DS3800NVRC1C1C if a relay fails.

• Hot-swap – never insert or remove the DS3800NVRC1C1C while the rack is powered; relay coils may latch unexpectedly and cause unintended trips.

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

• Storage – store spare DS3800NVRC1C1C boards in anti-static bags in a dry, temperature-controlled environment; although sealed relays are protected, other PCB components are still sensitive.