Hubbell LX-440 Optional Features, Transfer Switch, Auxiliary Contacts, Manual Disconnect Switch

Transfer Switch

Auxiliary Contacts

Auxiliary contacts TSNa3, -a4 and TSEa3, -a4 are available for remote alarms, pilot lights, or other applications. These contacts are pre-wired for customer connections to PTB1-7 through PTB1-12. The contacts are rated at 10 A, 125/250 VAC.

Manual Disconnect Switch

The MDS (Manual Disconnect Switch) is mounted on the TRC board. This switch isolates the power source to the switching mechanism. Then the automatic transfer switch can only be operated manually with the handle.

CAUTION: Disconnect normal and emergency power sources before using handle to transfer the contacts.

TEST push button

The TEST push button simulates a loss of power from the normal source and causes the Control Module to initiate transfer to the emergency source.

Optional Features

The items described in this section are a few of the optional features available with the LX-450 automatic transfer switch. Contact the local Hubbell representative for additional options desired for an application. Refer to the job schematic and wiring diagrams for these and other features.

BYPASS/RETRANSFER TO NORMAL push button (S1)

This option is standard for combination Fire Pump Controller with automatic transfer switch to meet NFPA 20 specifications.

Pressing this button allows the transfer switch to retransfer to the normal position bypassing the RETRANSFER TO NORMAL SOURCE time delay.

Phase Rotation Monitor (H1)

The PRM (Phase Rotation Monitor) contacts open if the phase rotation of the normal power source is not correct. If the proper phase sequence is not sensed, the LX-301 Control Module does not output a signal to the TCR board to retransfer the transfer switch to the normal source.

Auxiliary Contacts (A1–A4)

One additional NO/NC set of contacts may be added to the normal and the emergency source side of the transfer switch. The contacts are rated for pilot duty: 10 A at 125 or 250 VAC.

BYPASS/TRANSFER TO EMERGENCY push button (S2)

This push button overrides the time delay to transfer to the emergency source.

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