Download Series 300 Frequently Asked Questions Features

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Shaded DIP switches are standard factory settings.
If the Motor Load Transfer feature is enabled, it will be activated following the Load Disconnect Feature Delay
before Transfer delay.
How do I specify an ATS?
For Series 300 (Automatic) click here
For 386 (Non-automatic) click here
For Service Entrance 3AUS click here
For a Series 300L Power Transfer Load Center just click here
How do I specify the type of neutral required?
A Solid Neutral means that the system neutral conductors (load, emergency and utility) are solidly bonded to a
common lug and a copper plate. The connection of the 3 neutral conductors is fixed to the common lug. It is
denoted by an A2 (2 pole) or A3 (3 pole) in the catalog.
A Switched Neutral means that the load neutral conductor connection is switched between the emergency
neutral and the utility neutral. It is denoted by a B2 (2 pole) or B3 (3 pole) in the catalog number string.
An Overlapping Neutral means that the load neutral conductor is connected to both the normal and
emergency neutrals before the transfer and then remains in the position where the switch transferred to. It is a
make before break neutral design. It is denoted by a C2 (2 pole) or C3 (3 pole) in the catalog number string.
How do I specify the TVSS for the ATS?
Specify the surge suppressor (Accessory 73) as an optional accessory upon ordering:
Normal source protection. (3Ø, 4wire WYE)
Emergency source protection. (3Ø, 4wire WYE)
Load side protection. (3Ø, 4wire WYE)
Other distribution voltages available, supplied as a standalone, not mounted or wired.
(Contact ASCO).
What auxiliary control features does the ATS offer?
3. Remote Test – Requires a customer supplied normally closed contact. Opening of the contact simulates a
failure of the normal source similar to the sequence for the transfer switch test push button. The transfer switch
will remain connected to the emergency source under all conditions while the contact is open.
1. Accessory 14A – Auxiliary Contacts which are closed on normal.
2. Accessory 14B – Auxiliary Contacts which are closed on emergency.