Introduction, 0 introduction, Transfer switch – Hubbell LX-440 User Manual
Page 3
Transfer Switch
Page 3 of 16 Pages
1.0 Introduction
Hubbell’s non-automatic, LX-440, and automatic, LX-450, transfer switches are available in 2, 3, and 4
pole models with ampere ratings of 100 to 1250 A. The transfer switches are available as open type or
in an individual cabinet.
The automatic transfer switch has a Solid State Transfer Control Module, LX-301, that monitors voltage
and controls the transfer to and from the normal and emergency sources. The non-automatic transfer
switch has a selector switch to manually initiate transfer. A handle is included with all transfer switches
to manually close the normal or emergency contacts.
PRM
optional
Control
Module
(LX-301)
Transfer Control
Relay Board
Switching
Mechanism
To engine
start contacts
(If generator backup)
Emergency
Source
Normal
Source
TSE
TSN
To load
Normal Source
Transformer
Emergency Source
Transformer
Figure 1-1 Block Diagram of automatic transfer switch showing one phase
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