TS 870 Manual Transfer Switch
UL 1008/ CSA 178 Certified, 100 - 1200 AMP Single & 3 Phase 600V Max

Thomson Power Systems TS 870 Manual Transfer Switch employs an enclosed contact power switching unit with an electrically operated control mechanism to allow manual selection of desired power source to feed a common load.

All manual load transfer sequences are “Open Transition” (i.e. “break-before-make”). All TS 870 Manual Transfer Switch models have been tested in accordance with UL 1008 standards. Molded case circuit breakers or fuses with overcurrent protection are required upstream of the transfer switch. The standard Manual Transfer Switch is rated for 100% system load. Operating status is provided via LED indicators visible on the front of the enclosure.

Stock Models

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 Amperage Range: 100A - 1200A
 Voltage Range: 208 - 600V
 Poles: 2, 3 or 4
 Frequency: 50/60Hz 
 Power Distribution: Single Phase, 3 wire or 3 Phase, 4 wire
 Standard Enclosure: Nema 1
 Safety Standard:  UL 1008
 Quality Assurance: ISO 9001 Registered 
 Warranty: 2 Year 


Thomson Power Systems TS 870 Manual Transfer Switch offers the following outstanding features:

Enclosed Contact Power Switching Units

  • Fully enclosed silver alloy contacts provide high withstand rating & 100% continuous current rating
  • 3 cycle short circuit current withstand tested allows use of non-series rated upstream protective devices
  • Completely separate utility and generator power switching units provide superior reliability through redundancy

Reliable Motor-Operated Transfer Mechanism

  • Heavy duty brushless gear motor and operating mechanism provide mechanical interlocking and extreme long life with minimal maintenance
  • Electrical and Mechanical Interlocked mechanism prevents simultaneous closure of Utility and Generator sources

Superior Serviceability

  • All mechanical and control devices are visible and readily accessible

Control Features

  • Source available and load status LED pilot lights
  • Source selection control switch for manual operation


OPTIONAL FEATURES: (Specify separately from ATS MODEL CODE when ordering)


AUX-G    Auxiliary Contact – Generator Side (up to Qty 3)
AUX-U    Auxiliary Contact – Utility Side (up to Qty 3)
UPA        Utility Power Available Contact (up to Qty 3)
CMLKG   CAM LOK connectors for Generator Supply
TS-H1     Enclosure Strip Heater c/w Thermostat (120VAC external Source Required)
TS-H2     Enclosure Strip Heater c/w Thermostat (internally powered from ATS Load)



Engineering Briefs


Schematic Drawings

Physical Drawings

Ordering Information

TS 870 Manual