TS 910 TRANSFER SWITCH
PM140 REV 0 12/02/09 11 Thomson Technology
6. OVER CURRENT PROTECTION
6.1. STANDARD TS 910 AUTOMATIC TRANSFER SWITCH
The standard TS 910 Automatic Transfer Switch does not contain any integral over current
protection and requires upstream over current protection devices for both Utility and
Generator sources. The Standard TS 910 is rated for 100% continuous loading and can
withstand a maximum short circuit fault current as noted in Section 17 of this manual. The
standard TS 910 transfer switch model without integral over current protection is identified in
the product model code. Refer to Section 4.1 of this manual for further details on model
coding.
6.2. SERVICE ENTRANCE RATED TS 910 AUTOMATIC TRANSFER SWITCH
TS 910 transfer switches have integral over current protection supplied on the Utility source
as standard. For transfer switches rated 100A through 400A, over current protection is non-
adjustable thermal-magnetic type.
7. GENERAL NOTES ON SERVICING TRANSFER SWITCH
MECHANISM
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
Only qualified personnel should undertake Service work. 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.
When performing any service work on the transfer mechanism, it is imperative that the
following be observed:
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