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Thomson TS910SE Auto Transfer Switch (1Ph, 400A)


SKU: TS912A0400B Category Tag Brand:
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Free Shipping in the Continental United States
Please call for orders to Alaska or Hawaii.

Thomson TS 910 SE Automatic Transfer Switches are perfect for residential and light commercial applications. These switches employ a power contactor switching unit with a microprocessor based controller to automatically start a generator and transfer system load to the generator supply in the event of a utility supply failure. System load is automatically re-transferred back to the utility supply following restoration of the utility power source to within normal operating limits. All load transfer sequences are “Open Transition” (i.e. “break-before-make”) utilizing an in-phase transfer detection control sequence. Service Entrance Rated.

Power Contactor Switching Units

  • 100% Continuous Current Ratings for use with all load types
  • Suitable for Copper and Aluminum power cable connections
  • High Short Circuit Withstand Ratings when used with upstream molded case circuit breakers

Reliable Solenoid Operated Transfer Mechanism

  • Fast Operation allows In-Phase Power Transfer
  • Electrical and Mechanical Interlocked mechanism prevents simultaneous closure of Utility and Generator sources

Service Entrance Rated

  • Utility service disconnect breaker switch
  • Non-adjustable thermal-magnetic over-current protection on utility
  • Still requires upstream over-current protection for the generator source (not included)

Superior Serviceability

  • Plug-in Control Devices allow superior field serviceability
  • Enclosed Power Contacts for safe operation and maintenance

Quality Assurance

  • ISO 9001 Registered Manufacturing Facilities
  • Complies with NEMA & UL50, UL 508, IEEE C62.41, C37.90.1; FCC CFR 47 Part 15, Class B; IEC EN 61000 Electromagnetic Capability

Safety Standards

  • UL 1008 Listed Automatic Transfer Switches for use in optional standby Systems

Control Features

  • New/Advanced TSC 9 Series Transfer Controller with features specifically designed for Residential and Light Commercial ATS applications. User programmable timers, Simple LED interface
  • Normal Operation Status LED Lights: Load on Utility & Load on Generator, Utility & Generator Source Available, Engine Start Activated, Load Shed Activated
  • Diagnostic LEDs: System OK, Alarm, Wait For Transfer, Diagnostic
  • USB Port Factory Programming/Diagnostic
  • Voltage sensing on Utility & Generator
  • Generator AC frequency sensing
  • Utility under voltage control set point 70% dropout (fixed)
  • Generator Set points: under voltage 70% dropout (fixed), under frequency 90% pick-up (fixed)
  • Engine warm-up timer (Selectable 10 sec, 30 sec, 60 sec)
  • Utility return timer (Selectable 10 sec, 60 sec, 120 sec)
  • Engine start timer (Selectable 3 sec, 6 sec, 10 sec)
  • Engine cool down timer (Selectable 60, 120, 300 sec)
  • Integrated Programmable Generator Exercise Timer with easy to configure 7, 14 or 28 day, On-load or Off-load Programmability, initiate pushbutton & light
  • Local utility power fail simulation test pushbutton & LED, front faceplate mounted
  • Engine start contact (5A, 120/240VAC resistive max.)
  • Load Shed contact (5A, 120/240VAC resistive max) for optional automatic load shedding of selected non-essential loads when power source is switched to the generator. (Optional Load Shed Control Kits are also available)
  • Alarm Output (100ma, 24Vdc)


TS910 Brochure

TS910 Quick Start Guide

TS910 Manual

TS910 Warranty


Please see the Accessories Tab for more information and to order.

  • Enclosure Heater Kit
  • Surge Protection Device
  • KW Load Shed Control Kit
  • Universal Generator Interface Start Kit
Model Number






Withstand Rating @ 240VAC


Cabinet Type

Service Entrance Rated

Engine Start Contacts

Full Dimensions HxWxD (inches)


Limited Warranty


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