Cutler-Hammer ATVISPE31000XSU, Instructions Manual

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I.B. ATS-SD02
Page 7
Effective 5/98
SECTION 3: EQUIPMENT DESCRIPTION
3.1 GENERAL
This Cutler-Hammer transfer switch equipment is avail-
able in three different configurations:
• Automatic Transfer Switch
• Non-Automatic Transfer Switch (Electrically Operated)
• Bypass Isolation Transfer Switch
Refer to Section 1 for a discussion of the four types.
Each transfer switch is usually supplied in an enclosure,
although unmounted sub-assemblies can be supplied for
mounting by the customer. Since the enclosed automatic
transfer switch encompasses all transfer switch equip-
ment possibilities, it is the only specific type that will be
discussed in this section.
The enclosed automatic transfer switch consists of three
basic panels interconnected through connector plugs
and mounted in an enclosure:
• Power Panel
• Voltage Selection Panel
• Logic Panel
- IQ Transfer
- Solid State
The components comprising the three panels are installed
in accordance with the specific requirements of the circuit
being controlled. Each transfer switch is, therefore, tailor-
made to a specific application.
3.2 POWER PANEL
The power panel consists of a means for making load,
power, and neutral connections. The main contacts and
the transfer mechanism are all on one steel frame
(Figures 3-1). The actual power connections are shown
in Figure 3-3.
3.2.1 MAIN CONTACTS
The main contacts connect and disconnect the load to
and from the different power sources. High withstand
insulated case switches are the main contacts for the
Normal and Emergency power sources in standard,
unmodified automatic transfer switches. Optional inte-
gral thermal and short circuit protection in either or both
switching devices is available (Figure 3-2 and Section
3.6). These continuous duty devices are rated for all
Figure 3-1 Typical Power Panel Figure 3-2 Insulated Case Circuit Breaker