T400N Elite Hotswitch
Temperature Monitor for Bucket Elevators and Conveyors


The T400N Elite Hotswitch is a microprocessor controlled temperature monitor, which works in conjunction with NTC type bearing & surface temperature sensors to monitor up to 8 inputs.  The unit can provide an alarm and automatic shutdown, on up to 2 machines, when a high (hot) bearing or surface temperature condition is detected.


Alarm and status LEDs on the lid of the T400N provide quick location of alarm conditions.  Alarm muting can be performed at the panel or by an optional remote push button to silence external alarms.  If the system is muted, it will automatically reactivate when a new alarm is triggered.  Testing can also be activated at the panel, providing full system verification.



  T400N Elite Hotswitch Temperature Monitor  

• Bearing & Surface Temperature Monitor


• Monitors up to 8 NTC Type Temperature Sensors


• 2 Separate Alarm & 2 Separate Stop Relays


• Status LEDs Show Location of Sensor Alarm


• Short / Open Circuit Fail-Safe Detection


• Test Feature for Simple System Testing

  Product Questions? (309) 698-5611Phone or Email  Email    
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  T400N Elite Technical Specifications:   Literature:  
  • Power Supply - 120 to 240 VAC or 24 VDC   Product Datasheet Download PDF  
  • Alarm Relay Contacts - Zone 1: 1 Pole Normally Open (8A @ 250 VAC)   Full Line Product Catalog Download PDF  
                                               Zone 2: 1 Pole Normally Open (8A @ 250 VAC)   (See Downloads for more literature)  
  • Stop Relay Contacts - Zone 1: 1 Pole Normally Open (8A @ 250 VAC)      
                                             Zone 2: 1 Pole Normally Open (8A @ 250 VAC)   Technical:  
  • Sensor Inputs - 8 NTC Thermistors Maximum   Product Manual Download PDF  
  • Sensor Supply - 24 VDC (100 mA Maximum)      
  • LED Indicators - Power, Zone (1 - 8) and Alarm   Product Dimensions:  
  • Push Buttons - Alarm Mute and Test   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  Approvals:   Compare Speed Switches Compare Monitoring Systems  
  • CSA Class II Div 2 Groups F & G      
  • CSA Class II Div 1 Available (Class 2 Power Supply Required)          
  • ATEX, IECEx and CE Versions Available      
  CSA - USA & Canada ATEX - Europe CE - Europe IECEx           
  Part Numbers and Accessories:      
  • T4004NV46C ~ T400N Elite - Hotswitch (CSA - Class II, Div. 2)      
  • T4004NV4C ~ T400N Elite - Hotswitch (CSA - Class II, Div. 1)      
  • PS3800V4 ~ Class 2 Power Supply (24 VDC / 3.8 A)      
  • ADB20V3C/D2 ~ Adjustable Depth Bearing (ADB) Temp. Sensor - 2in. Probe      
  • ADB20V3C/D3 ~ ADB Bearing Temperature Sensor - 3 in. Probe      
  • ADB20V3C ~ ADB Bearing Temperature Sensor - 4 in. Probe      
  • ADB20V3C/D6 ~ ADB Bearing Temperature Sensor - 6 in. Probe      
  • ADB20V3C/D8 ~ ADB Bearing Temperature Sensor - 8 in. Probe      
  • ADBT1 ~ Adjustable Depth Bearing Temperature Sensor Tester      
  • WDB70V3C ~ Lug Style Surface Temperature Sensor      
  • WDB20V3C ~ Bearing Temperature Sensor (Non-Adjustable Probe)      
    ~ NOTE: Not All NTC Type Temperature Sensors Listed ~      
  Literature:   Product Dimensions:  
  Product Datasheet Download PDF   Download AutoCAD .dwg (AutoCAD)      Download PDF .pdf  
  Full Line Product Catalog Download PDF      
      Articles, Papers & Case Studies:  
  Technical Manuals & Documentation:   Hazard Monitoring Overview - GEAPS Paper Download PDF  
  Product Manual Download PDF   Monitoring Equipment (Grain Journal Series) Download PDF  
  RS485 Wiring Guide Download PDF   Bucket Elevator Monitoring Systems Download PDF  
      Combustible Dust Standards (Grain Journal Series) Download PDF  
  Note: Product manuals for older part numbers can be   Slack / Broken Chain Detection Download PDF  
  found under the Technical Support area.      
  To See Illustrated Sensor Placement Diagrams For Specific Equipment, CLICK HERE  
Bearing Temperature Sensor

Bearing Temperature Sensor

The ADB series have been designed to allow the depth of the sensor to be adjustable.  They screw directly into a bearing housing through the existing grease zerk thread.  Each sensor is fitted with a grease zerk to allow lubrication of the bearing without the need for removal of the sensor.

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ADB Bearing Sensor Tester

ADB Bearing Sensor Tester

The ADB Sensor Tester has been designed to test 4B adjustable depth bearing (ADB) temperature sensors in the field.  During planned maintenance or periodic testing, this diagnostic tool to verify the alarm and shutdown sequences of the control unit are functioning as expected.

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Surface Temp Sensor

Surface Temperature Sensor

The WDB7 bolts directly onto a bearing housing, motor, gearbox, or machine casing for continuous temperature monitoring.

More Info

  Does 4B offer inspection, testing and commissioning services for your hazard monitoring systems?  
  Yes, the 4B Tech Team is available for on site services.   For more information, CLICK HERE.  
T400N Elite Hotswitch Temperature Monitor
  Hot Bearing on Belt Conveyor Westwego Grain Elevator Disaster  
  CSB Video - What Led to the Imperial Sugar Explosion    
  Preventative maintenance can help reduce the risk of equipment failure and consequent downtime.  When it comes to  
  monitoring your bucket elevators and conveyors, 4B can recommend the ideal combination of sensors and monitoring  
  systems to suit your requirements and budget.  
  4B has an extensive range of CSA / ATEX / IECEx approved hazard monitoring systems, misalignment switches,  
  bearing temperature monitors and level controls.  4B can offer you anything from a replacement sensor, to a fully  
  integrated hazard monitoring system which can be operated as a stand-alone device or connected to your PLC.  
  And if you do not want to install hazard monitoring sensors on every piece of equipment in your plant straightaway, 4B  
  can offer you a scalable solution that can be expanded as your needs grow.  
  To get a free recommendation from our engineers, CLICK HERE to fill out our online form.