Bently Nevada 3500/32 125712-01 4-Channel Relay Module
Technical Specifications
– Module size : full-height, single-slot, front plug-in
– Relay channels : 4, each DPDT (2 × SPDT)
– Contact rating : 5 A @ 24 Vdc / 120 Vac (resistive)
– Max switching voltage : 250 Vac / 30 Vdc
– Operate time : ≤ 10 ms (typical)
– Isolation : 1 500 Vrms coil-to-contact & channel-to-ground
– Power draw : 5 W max (24 Vdc from rack back-plane)
– MTBF : >300 000 h @ 45 °C per MIL-HDBK-217F
– Operating temperature : –40 °C to +85 °C
– Storage temperature : –55 °C to +100 °C
– Humidity : 5 % – 95 % RH non-condensing
– Shock / vibration : 15 g ½-sine 11 ms; 2 g 5-500 Hz operational
– Dimensions : 177 mm × 127 mm × 70 mm (7″ × 5″ × 2.8″)
– Weight : 1.1 kg
– Agency approvals : CE, UL/cUL Class I Div 2, ATEX/IECEx Zone 2, RoHS, ABS marine
Description
Functional Highlights
– Independent alarm-drive logic – every relay can be programmed with AND/OR combinations of any monitor channel alarm (Warning / Danger / OK) or real-time value
– Three output styles – bus relay, dedicated relay or independent relay to match different voting philosophies
– Fail-safe capability – normally-energised or normally-de-energised contact state selectable; supports latching and non-latching modes
– Hot-swap maintenance – module can be inserted or removed under power without disturbing rack operation or protection
– On-board diagnostics – front LEDs (OK, TX/RX, CH ALARM) give instant visual feedback; detailed relay health, cycle count and contact wear data are reported over the rack Ethernet link
– Sealed contacts – epoxy block protects against dust, moisture and corrosive atmospheres (Class G3)
– Firmware flash – field-upgradeable through 3500 Rack Configuration Software in <3 min; rollback image stored for safety
– TMR ready – certified for use in Triple Modular Redundant racks where 2-out-of-3 voting is required
– Independent alarm-drive logic – every relay can be programmed with AND/OR combinations of any monitor channel alarm (Warning / Danger / OK) or real-time value
– Three output styles – bus relay, dedicated relay or independent relay to match different voting philosophies
– Fail-safe capability – normally-energised or normally-de-energised contact state selectable; supports latching and non-latching modes
– Hot-swap maintenance – module can be inserted or removed under power without disturbing rack operation or protection
– On-board diagnostics – front LEDs (OK, TX/RX, CH ALARM) give instant visual feedback; detailed relay health, cycle count and contact wear data are reported over the rack Ethernet link
– Sealed contacts – epoxy block protects against dust, moisture and corrosive atmospheres (Class G3)
– Firmware flash – field-upgradeable through 3500 Rack Configuration Software in <3 min; rollback image stored for safety
– TMR ready – certified for use in Triple Modular Redundant racks where 2-out-of-3 voting is required
Application Scenarios
– Steam & gas turbine TSI cabinets – energise emergency stop solenoids, lift trip oil or annunciate overspeed alarms
– Offshore platform centrifugal compressors – drive fire & gas deluge valves, start standby pumps or send shutdown signals to DCS
– LNG refrigeration trains – isolate motor feeders on high vibration or differential expansion alarms
– Ethylene hyper-compressors – combine radial-vibration and temperature alarms through AND logic to initiate rod-drop shutdown
– Cross-country pipeline pump stations – redundant relay pairs vote to trip motor starters on thrust-bearing failure
– Steel mill blast-furnace blowers – energise visual/audible stack lights for early warning of gear-tooth damage
– Wind-turbine test stands – switch brake calipers when tower vibration exceeds safe threshold
– Nuclear feed-water pumps – TMR relay set meets IEEE 338 requirements for safety-related actuation
– Steam & gas turbine TSI cabinets – energise emergency stop solenoids, lift trip oil or annunciate overspeed alarms
– Offshore platform centrifugal compressors – drive fire & gas deluge valves, start standby pumps or send shutdown signals to DCS
– LNG refrigeration trains – isolate motor feeders on high vibration or differential expansion alarms
– Ethylene hyper-compressors – combine radial-vibration and temperature alarms through AND logic to initiate rod-drop shutdown
– Cross-country pipeline pump stations – redundant relay pairs vote to trip motor starters on thrust-bearing failure
– Steel mill blast-furnace blowers – energise visual/audible stack lights for early warning of gear-tooth damage
– Wind-turbine test stands – switch brake calipers when tower vibration exceeds safe threshold
– Nuclear feed-water pumps – TMR relay set meets IEEE 338 requirements for safety-related actuation
Installation & Maintenance
The module plugs into any full-height front slot; a rear I/O card (125712-01) delivers four Euro-style plug connectors for field wiring.
Captive screws provide chassis earth bonding and vibration resistance.
Front LEDs give immediate status indication; relay cycle counters and contact wear estimators are accessible through System 1 or any Modbus client.
Replacement takes <1 min with no need to power-down the rack or re-configure monitor set-points.
The module plugs into any full-height front slot; a rear I/O card (125712-01) delivers four Euro-style plug connectors for field wiring.
Captive screws provide chassis earth bonding and vibration resistance.
Front LEDs give immediate status indication; relay cycle counters and contact wear estimators are accessible through System 1 or any Modbus client.
Replacement takes <1 min with no need to power-down the rack or re-configure monitor set-points.
Compatibility
Backward- and forward-compatible with every 3500 monitor (3500/40M, 3500/42M, 3500/44M, 3500/45, 3500/46M, 3500/50, 3500/60, 3500/62, 3500/70M, 3500/72M, 3500/77M, 3500/90, 3500/92, 3500/93) and with 3500/22M TDI or legacy 3500/20 RIM modules.
Supported by System 1 v6.5 onward and by third-party OPC UA, Modbus and DNP3 clients.
Backward- and forward-compatible with every 3500 monitor (3500/40M, 3500/42M, 3500/44M, 3500/45, 3500/46M, 3500/50, 3500/60, 3500/62, 3500/70M, 3500/72M, 3500/77M, 3500/90, 3500/92, 3500/93) and with 3500/22M TDI or legacy 3500/20 RIM modules.
Supported by System 1 v6.5 onward and by third-party OPC UA, Modbus and DNP3 clients.
Ordering Reference
3500/32-01-01-00 125712-01 – Standard 4-channel relay module, DPDT, conformal coat
3500/32-01-02-00 125712-01 – As above plus isolated coil drive
3500/32-02-01-00 125712-01 – TMR version for triple-redundant racks
3500/32-AXX-BXX-CXX – Full modular option table for contact material, firmware revision and hazardous-area certification
3500/32-01-01-00 125712-01 – Standard 4-channel relay module, DPDT, conformal coat
3500/32-01-02-00 125712-01 – As above plus isolated coil drive
3500/32-02-01-00 125712-01 – TMR version for triple-redundant racks
3500/32-AXX-BXX-CXX – Full modular option table for contact material, firmware revision and hazardous-area certification
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