TS 880 TRANSFER SWITCH
PM064 REV8 10/01/25 22 Thomson Technology
6.1. STANDARD TS 880 AUTOMATIC TRANSFER SWITCH
The standard TS 880 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 880 is rated for 100% continuous loading and can
withstand a maximum short circuit fault current as noted in Section 13 of this manual. The
standard TS 880 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. OPTIONAL TS 880 AUTOMATIC TRANSFER SWITCH WITH INTEGRAL
OVER CURRENT PROTECTION
TS 880 transfer switches will have integral over current protection supplied on the Utility
source as standard. The type of over current protection utilized is dependent upon ATS
amperage size and optional features specified. For transfer switches rated 100A through
200A, over current protection is non-adjustable thermal-magnetic type trip units. For
transfer switches rated 400A through 4000A over current protection is adjustable electronic
type with long time & instantaneous trip unit elements with optional ground fault protection
elements.
Note: Ground fault protection is supplied as standard on 1000A and 1200A transfer
switches that are used on systems greater than 240V.
An upstream over current protection device is required on the generator source which feeds
the TS 880 Transfer Switch if integral over current protection option is not specified on the
ATS.
Note: For models of transfer switch with adjustable integral over current protection trip units,
the over current protection must be set prior to operation. The equipment will be shipped
from the factory with a long-time current setting of 100% (of the equipment rating) and
maximum instantaneous/short-time current and time delay settings.
WARNING!
Do Not Energize this equipment until
device settings have been verified to
ensure proper system protection &
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