Bently Nevada 3500/32M 149986-02
Full name: 4 Channel Relay Module (Front Card Main Control Unit)
Order model: 3500/32-01-00
✅ Matching rear I/O output card (the card you inquired about)
Standard version: 125720-01
Functional safety/explosion-proof applicable version: 125720-02
⚠️ Important: 149986-02=front card (main control); 125720-01/02=I/O rear terminal board, the two must be paired together as a set and cannot be installed separately!

1、 Summary of Model Information
Front card body PN: 149986-02 (3500/32M)
Complete order model: 3500/32-01-00
Standard I/O rear card: 125720-01 (standard built-in European terminal)
SIL/Hazardous Area Selection: 125720-02
2、 Core functions
3500/32M is a full-size relay card that provides 4 independent SPDT single pole double throw dry contacts;
All monitoring modules (40M/42M/50M/25/62, etc.) in the receiver rack are in alarm status, and the software is internally configured with AND/OR logic voting to drive external alarm and interlock circuits.
4 independent relay outputs, each channel can be configured separately: Alert/Danger/Not OK
Support relay settings: normally dead ND/normally charged NE, latch/non latch mode
Panel indicator lights: OK, TX/RX communication, 4-channel independent CH ALARM channel alarm
Built in arc suppression, epoxy resin sealed relay
Supports hot plugging and backplane bus power supply
3、 Relay contact specifications
Contact type: SPDT Form C
Resistive load: 5A @ 250VAC; 5A @30VDC
Minimum driving current: 100mA @ 12VDC
4、 3500/32M vs 3500/33 Key Differentiation (Procurement Avoidance)
Table
Model, Channel, Quantity, Appearance, SIL Options, Applicable Scenarios
3500/32M 4-channel relay full height card without SIL certification, ordinary alarm circuit, low point requirements
3500/33 (- SIL2) 16 channel relay full height card with optional SIL2 mass interlocking and safety shutdown circuit
Engineering Tip: For safe shutdown SIL circuits, priority should be given to 3500/33-SIL2; 3500/32M is mostly used for ordinary alarms.
5、 Lifecycle information
Continuous supply from the original factory; New original and disassembled testing spare parts are available in the market
Warranty reference: Brand new original 12 months, disassembled spare parts 3-6 months