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Thomson TS880 Auto Transfer Switch (3Ph, 800A)

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SKU: TS883A0800A1C Category Tag Brand:

This Thomson TS 880 Automatic Transfer Switch is ideal for mission critical commercial and industrial three phase applications up to 800A. Open Transition configuration is standard. Options include Closed Transition and Bypass Isolation.


  • Numerous three phase voltages available up to 600V – 3-wire or 4-wire systems. Three or four poles.
  • Employs two mechanically interlocked power switching units with a micro- processor based controller.
  • Automatically starts generator and transfers system load to generator supply in the event of a utility supply failure.
  • Automatically re-transfers 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”) with adjustable neutral position delay. (Closed Transition operation also available – see below.)
  • Solid Neutral standard on 4 wire systems. (Please inquire about other options.)
  • Fully enclosed silver alloy contacts provide high withstand rating & 100% continuous current rating.
  • 3 cycle short circuit current withstand tested.
  • Completely separate utility and generator side power switching units.
  • Not damaged if manually switched while in service.
  • Safe manual operation permits easy operation.
  • Superior serviceability with all mechanical and control devices visible and readily accessible.
  • ISO 9001 registered for quality assurance.
  • NEMA 1 enclosure standard with options of NEMA 3R, NEMA 3RX, and NEMA 12.
  • Seismic Certified for installation and operation per the following requirements: IBC 2012 – Section 13, Occupancy Category IV; ASCE7-05 Region 3 (minimum SS=200%); and OSHPD Certified.
  • Specifically designed and certified to CSA C22.2 No. 178 & UL 1008 Standards.


  • Isolation plug permits disconnecting control circuits from all power sources.
  • 2.3” back-lit LCD display for monitoring 3 Phase Utility/Generator voltage, system frequency, operation status, and alarms.
  • All parameters and configurations are entered without opening the front door.
  • Front panel editing with PIN protection.
  • Five key menu navigation.
  • Customizable status screens.
  • Load on Utility & Load on Generator indication.
  • Utility & Generator Source available indication.
  • 3 Phase Voltage sensing on Utility & Generator Sources.
  • Generator AC frequency sensing.
  • Utility under voltage control setpoint 70 – 95% (adjustable).
  • Generator under voltage control setpoint 70 – 95% (adjustable).
  • Generator under frequency control setpoint 70 – 90% (adjustable).
  • Engine warm-up timer 0-60 sec. (adjustable).
  • Utility return timer 0-60 min. (adjustable).
  • Engine start timer 0-60 sec. (adjustable).
  • Engine cooldown timer 0-60 min. (adjustable).
  • Neutral position delay timer 0-120 sec. (adjustable).
  • Load Disconnect Contact (LDC) for pre/post transfer control to signal external building systems such as elevators during transfer operations.
  • Multiple date and time scheduler for On-load or Off-load Programmability.
  • Real-time clock provides accurate event logging.
  • Data logging including total transfers to generator, total utility power failures, load on utility hours, load on generator hours and utility or generator voltage/frequency data at time of fault.
  • Two user Programmable Output Contacts rated 2A, 24VDC resistive and Two user Programmable Output Contacts rated 15A, 24VDC resistive, Form A. Each
    output contact is user programmable to 20 different functions including: Load on Utility, Load on Gen, Load Disconnect Contact (LDC), Fail to Transfer (FTT), Utility Power Available (UPA), Generator Power Available (GPA), Utility Power Fail, ATS Not in Auto, and ATS in Auto.
  • The Transfer Switch is pre-programmed with the following outputs enabled: Load on Utility, Load on Gen, Load Disconnect Contact (LDC), Fail to Transfer (FTT), and ATS Not in Auto.
  • Local and remote utility power fail simulation test.
  • Local plant exercise initiate push-button control.
  • Engine start contact (8A, 120/240VAC resistive max.).
  • Transfer fail/forced transfer logic.
  • Automatic force transfer to alternate supply should load voltage become de-energized.
  • 24VDC control power.
  • Remote Load Test/Peak Shave Input.
  • Under/Over Frequency Protection- Utility and Generator Sources.
  • 3 Phase Over Voltage Protection – Utility and Generator Sources.
  • Phase Sequence and Phase Rotation Protection between Utility and Generator Sources.
  • Voltage Phase Loss/Unbalance Protection.
  • Programmable Inputs (Quantity 8 Digital Input-voltage free input).
  • RS485 Modbus Remote Communication Port (Modbus Serial RTU).


  • Employs two electrically interlocked insulated case power switching units and a microprocessor based controller to automatically allow a Closed Transition load transfer when both utility and generator sources are available.
  • All Closed Transition transfer sequences ensure both sources of power are in synchronism prior to transfer and load is transferred without power interruption.
  • Automatic control & protection circuits ensure the generator and utility supplies are only in parallel for a maximum of 100 milliseconds to permit an uninterrupted load transfer.
  • Reverts to an Open Transition load transfer sequence when only one power source is available.
  • Ideal for Emergency Power System applications such as commercial, industrial, or government institutions that require automatic standby power and minimal power interruptions to the load.
  • Allows optional use of integral over current trip elements within the power switching units thus eliminating the need for external, upstream protective devices.


  • Employs an interlocked power switching mechanism that provides an easy and safe procedure for system maintenance personnel to manually isolate and bypass the automatic transfer switch.
  • Manually operated switch allows either generator or utility source to be bypassed to maintain power to the load while the automatic transfer switch is tested for maintenance procedures as required.
  • Allows a fast, simple and reliable method of isolating and bypassing the automatic transfer switch through a “break-before-make” bypass design.
  • Mechanical interlocking mechanism ensures that the utility and generator sources cannot be paralleled under any circumstance and the transfer switch may be bypassed to either source.
  • Closed Transition option may be operated in a “make-before-break” sequence at the operators’ direction.
  • Supplied as a single complete assembly with all power conductors provided between the bypass mechanism and the transfer switch.
  • Provisions for all external power cabling for the utility, generator and load conductors are provided for in the bypass/isolation compartment of the switch.
  • Bypass/isolation switch and transfer switch are mounted in separate barriered compartments.
  • Bypass isolation mechanism consists of 2 mechanically interlocked power switch devices and draw-out transfer power switching devices with key interlock mechanism.
  • Utilizing independent switching units provides a high degree of reliability and redundancy not available in other switches.
  • Specifically designed and certified to UL 1008 and CSA 22.2 No. 178 Safety Standards.


TS880 Brochure

TS880 Manual

TSC7320 Controller Manual

TS880 Warranty



  • AUX-BG – Generator Bypass Auxiliary Contact
  • AUX-BU – Utility Bypass Auxiliary Contact
  • KOTS-DSE – Key Operated Test Switch- Auto/Off/Engine Start/Test – includes DSE2130 module
  • RO2157 – Programmable Relay Output Expansion Module – Includes QTY 8, 2A Resistive 30VDC rated relays – 4 NO and 4 Form C Contacts.
  • TS-STG – 24Vdc or 120VAC Shunt Trip Generator Switch (external power source required)
  • TS-STU – 24Vdc or 120VAC Shunt Trip Utility Switch (external power source required)


  • EMB-TCP/IP – Ethernet ModbusTM Remote Communication (ModbusTM TCP) via (DSE855)
  • RA 7320 (DSE2548) – Remote Annunciator with eight configurable LEDs. Works up to 0.6 miles from the TSC7320. Up to 10 modules can be daisy-chain (Refer to the DSE2548 Datasheet).
  • RD 7320 (DSE2520) – Remote Display. Up to three display modules can be connected to TSC7320 (Refer to the DSE2510-20 Datasheet).


  • NEMA 3R Outdoor, NEMA 3RX, and NEMA 12
  • LCK – Enclosure Lockable Door (Single point T-Handle lock)
  • TS-H1 – Enclosure Strip Heater c/w Thermostat (120VAC external power source required)
  • TS-H2 – Enclosure Strip Heater c/w Thermostat (internally powered from ATS load)


  • TS-SS – Internal Multi-Voltage Selector Switch (208V/240V/480V)
  • TCP – Transfer Switch Connection Plate for Generator Supply (camlocks)


  • LPM-DSE – Transfer Switch Load Power Metering CT Kit (Amp, Volt, Freq, kW, kVA, PF) **Requires CT Kit
  • CTKxxxx – Current Transformer Kit (xxxx -Specify CT Size 800, 1200, 1600, 2000, 3000, 4000). **Requires GPM Option
  • MUP – Multifunction Utility Protective Relay – Basler IPS100 (Protection Functions 27, 32, 47, 50/51, 67, 81O/U (Note: May be required by local utility for Soft Load CT applications or even Momentary CT applications. Please inquire for other makes and models.)


  • SPD – Surge Protection Device
Model Number



Voltage Options



Lugs per Phase

Cabinet Type

Service Entrance Rated

Dimensions HxWxD (inches)


Limited Warranty


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