Contact Ratings for Hazardous Area Systems
Technical Specifications of Bently Nevada 3500/33-01-01
The Bently Nevada 3500/33 (Model 3500/33-01-01) delivers 16 relay channels. You can group these channels into four sets of four. Each group operates in Normally De-energized (ND) or Normally Energized (NE) mode.
Power and Front Panel Indicators
Power Consumption: Consumes only 5.8 Watts typically.
OK LED: Lights up when the 3500/33-01-01 works properly.
TX/RX LED: Flashes during communication with other 3500 rack modules.
CH Alarm LED: Lights up when a relay channel enters an alarm state.
Relay Specifications
The 3500/33-01-01 uses single-pole double-throw (SPDT) relays. Each relay has epoxy sealing for environmental protection. Arc suppressors rated at 250 Vrms come installed as standard.
Contact Ratings for Standard Systems (DC Resistive Load)
Contact Ratings for Standard Systems (AC Resistive Load)
Max Switched Current: 5 A
Max Switched Power: 1200 VA
Max Switched Voltage: 250 Vac
(cNRTLus Class 1 Div 2)Contact Ratings for Hazardous Area Systems
For the 3500/33-01-01 with hazardous area approval (Option 01):
Min Switched Current: 100 mA @ 5 Vdc
Max Switched Current: 5 A
Max Switched Voltage: 30 Vdc
Low Current Relay Applications (Special Order)
The 3500/33 also supports low current configurations:
Min Switched Current: 1 mA @ 1 Vdc
Max Switched Current: 100 mA @ 48 Vdc
Gold-plated relay minimum: 1 mA
Maximum before damage (gold relays): 5 mA
Environmental Limits
Operating Temperature: -30°C to +65°C (-22°F to +149°F)
Storage Temperature: -40°C to +85°C (-40°F to +185°F)
Humidity: 95%, non-condensing
Hazardous Area Approval: cNRTLus (Class 1, Division 2)
Installation Guide for 3500/33-01-01
Follow these steps to install the Bently Nevada 3500/33-01-01. Always power off the 3500 rack before starting.
Insert the main module into 1 full-height front slot of the 3500 rack.
Insert the I/O module into 1 full-height rear slot.
Connect your field wiring to the I/O module terminals.
Configure each relay group for ND or NE operation using the switches.
Power on the rack and verify the OK LED turns green.
Test each channel by simulating an alarm condition.
Note: The 3500/33-01-01 requires both front and rear slots. Do not leave the rear slot empty.
Package Contents (3500/33-01-01)
1 x Bently Nevada 3500/33 Main Relay Module (3500/33-01-01)
1 x I/O Module for rear slot
1 x Relay configuration label
Frequently Asked Questions (FAQ)
### 1. Can I mix ND and NE modes on the same 3500/33 module?
Yes. The 3500/33-01-01 has four groups of four channels. You set each group independently for ND or NE operation.
2. What is the contact life of each relay?
Each relay lasts 10,000 cycles at rated load. For longer life, use the low current configuration with gold-plated relays.
3. Does the 3500/33-01-01 work in hazardous areas?
Yes. Option 01 provides cNRTLus approval for Class 1, Division 2 hazardous locations. Contact ratings limit to 30 Vdc in this configuration.
4. What happens if I short the recorder output?
The 3500/33-01-01 does not have a recorder output. That feature belongs to monitor modules like the 3500/53 or 3500/77M.
5. Can I use this module with 125 Vdc loads?
Yes for standard systems. The 3500/33-01-01 supports 125 Vdc as max switched voltage. Check your load is resistive.
Why Choose This Bently Nevada 3500/33-01-01?
The 3500/33-01-01 gives you 16 reliable relay outputs in one slot. Its epoxy-sealed relays resist moisture and vibration. The hazardous area approval expands your installation options. Choose this Bently Nevada 3500/33 for alarm annunciation, trip logic, or equipment control.
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