Guardian Technologies 4389, 4456 Section, Part, Description & Components, The Fuse Holder

V-TYPE PREPACKAGED TRANSFER SWITCHES

PART 3

SECTION 3.1

DESCRIPTION & COMPONENTS

Figure 6. Transfer Switch Terminal Block

Terminals used on the terminal block are identified as Utility 1 and 2; 23 and 194.

UTILITY 1 AND 2:

Interconnect with identically labeled terminals in the generator control panel assembly. This is the utility voltage signal to the circuit board. The signal is delivered to a step-down transformer in the control module assembly and the resultant reduced voltage is then delivered to the circuit board. UTILITY 1 and 2 power is used by the circuit board as follows:

❏If utility source voltage should drop below a preset level, circuit board action will initiate automatic cranking and startup, followed by automatic transfer to the standby source.

❏Utility source voltage is used to operate a battery trickle charge circuit which helps to maintain battery state of charge during non-operating periods.

TERMINALS 23 AND 194:

These terminals connect the transfer relay to the generator circuit board. See "Transfer Relay" on Page 3.1-2.

FUSE HOLDER

The fuse holder holds two (2) fuses, designated as fuses F1 and F2. Each fuse is rated 5 amperes.

FUSES F1, F2:

These two fuses protect the terminal board UTILITY 1 and 2 circuit against overload.

Figure 7. The Fuse Holder

Page 3-1.4