TS 880 TRANSFER SWITCH
PM064 REV8 10/01/25 23 Thomson Technology
coordination. Failure to do so may result
in equipment failure.
Refer to Section 4.1 Product Model Code for types of integral over current protection which
are supplied with the transfer switch.
7. SERVICING TRANSFER SWITCH MECHANISMS
DANGER!!!!
Arc Flash and Shock Hazard. Will cause severe injury or death.
Do not open equipment until ALL power sources are disconnected
This equipment must be installed and serviced only by qualified electrical
personnel utilizing safe work practices and appropriate Personal Protective
Equipment (PPE). Failure to do so may cause personal injury or death
Failure to correctly maintain an automatic transfer switch may present a hazard to life and
equipment. Full operational testing must be done prior to placing a transfer switch in service
subsequent to any maintenance or repair. Any service work involving electrical components
requires high-potential testing to ensure that required insulation levels have been maintained.
7.1. SERVICING –100A-250A S STYLE MOLDED CASE SWITCH TYPE
TRANSFER MECHANISMS
7.1.1. GENERAL DESCRIPTION
The transfer mechanism consists primarily of the transfer gear motor, a drive hub
assembly, and two power switching device operating arms.
The reversible transfer gear motor drives the drive hub assembly, which in turn
moves the power switching device operating arms. The power switching device
toggles are set inside the operating arm slots and are moved by them. There are
two limit switches, which are contacted by the operating arms (one for each power
switching device), which disconnect the transfer motor power supply when the power
switching devices have attained full travel. Should limit switch adjustment be
required, it is advisable to consult Thomson Technology for further information.
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