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IB140058EN

For more information visit: www.eaton.com

Instructional Booklet

Effective: March 2016

Page

 

3

O&M Manual for 30-1000 Amperes

Manual Transfer Switch

1.2 General Information

Transfer switches are used to protect critical electrical loads 

against loss of power. The load's normal power source is backed 

up by a secondary (emergency) power source. A transfer switch is 

connected to both the normal and emer- gency power sources and 

supplies the load with power from one of these two sources. In 

the event that power is lost from the normal power source, the 

transfer switch transfers the load to the secondary (emergency) 

power source. Transfer can be automatic or manual, depending 

upon the type of transfer switch equipment being used. Once nor-

mal power is restored, the load is automatically or manually trans-

ferred back to the normal power source, again depending upon the 

type of transfer equipment being used (Figure 2)

1.2.1 Transfer Switch Types

Four types of basic transfer switch equipment are available:

Automatic Transfer Switch

Automatic transfer switches automatically perform the transfer 

function. They consist of three basic elements:

1. Main contacts to connect and disconnect the load to and from 

the power source.

2. A mechanism to transfer the main contacts from source to 

source.

3. Intelligence/supervisory circuits to constantly monitor the con-

dition of the power sources and thus provide the intelligence 

necessary for the switch and related circuit operation.

Basic Transfer Switch

The basic transfer switch is designed for use with customer fur-

nished controls. It is similar in design to the automatic version 

except the intelligence circuit (logic panel) and voltage selection 

panel are omitted. All automatic sensing devices, relays or solid-

state devices are the customer's responsibility.

Figure 2. Typical Load Transfer Switch (Circuit Breaker Type) 

Schematic.

Manual Transfer Switch (Manually Operated)

Manual transfer switches provide the main contacts and the trans-

fer mechanism to effect the transfer of the main contacts from 

source to source. Transfer of power, however, is accomplished by 

true hand operation (not power assisted) of the transfer switch. 

This switch is similar to the basic switch in that an intelligence cir-

cuit and a motor driven mechanism are not part of the design.

1.2.2 Design Configuration

The Eaton Transfer Switch is a rugged, compact design utilizing 

molded case switches to effect the transfer of essential loads 

from one power source to another (Figures 3, 4 and 5). Molded 

case switches are interlocked to prevent both switches from being 

closed at the same time. The versatile design, in addition to stan-

dard transfer functions, offers an optional integral thermal and 

short circuit protection in either or both switching devices.

Molded case switches and the associated transfer mecha- nism 

are usually mounted vertically in the assembly. The vertical config-

uration (225 - 1000 amperes) is accomplished by utilizing a posi-

tive, metallic transfer and interlocking system between the molded 

case switches. A horizontally mounted transfer mechanism is uti-

lized with transfer switches 30 - 150 amperes.

The Eaton Transfer Switch was designed with installation ease 

and simplified maintenance in mind. Three main panels comprise 

the automatic transfer switch design:

Power Panel

Voltage Selectin Panel

Logic Panel

Each panel is independently mounted with interconnecting wiring 

terminated in connector plugs to permit individual door or panel 

removal without disturbing critical connec- tions. Enclosure 

mounting is simplified by utilizing top and bottom mounting 

flanges with elongated mounting holes.

For the vertical design, installed power panel positioning bolts, 

elongated mounting holes and pre-tapped inserts insure proper 

power panel mounting after initial enclosure installation or when 

switching from top to bottom entry and vice versa. Refer to Sec-

tion 4 for mounting and modification details.

1.3 Transfer Switch Catalog Number Identification

Transfer switch equipment catalog numbers provide a signifi- cant 

amount of relevant information that pertains to a particu- lar piece 

of equipment. The Catalog Number Identification Table (Table 1) 

provides the required interpretation informa- tion. An example is 

offered to initially simplify the process.

Example:

  Catalog Number (bolded numbers correspond to posi-

tion headings in Table 1)

Table 1.

1 to 2 3

4

5 6

7

8

9 to 12

13

14

15

 

 MT

V

X

  KD

A

3   0300

X

S

U

The catalog number MTVXKDA30300XSU describes a Manual 

transfer switch with the switching devices mounted vertically in 

the enclosure. The Eaton Series CT Type HKD is used as the 

switching device and is in the form of a 3-pole molded case 

switch on each source. The continuous current rating of this 

equipment is 300 amperes and applicable at 480 Vac, 60 Hz. The 

transfer switch equipment is enclosed in a NEMAT 1 enclosure 

and is both UL and CSA listed.

Emergency Source

Normal Source

Load

Summary of Contents for MTVXKDA20225WRU

Page 1: ...m O M Manual for 30 1000 Amperes Manual Transfer Switch Instruction Booklet Description Page Introduction 2 Receiving Handling and Storage 5 Equipment Description 6 Installation and Wiring 10 Operatio...

Page 2: ...eding If further information is required by the purchaser regard ing a particular installation application or maintenance activity an Eaton representative should be contacted 1 1 1 Warranty and Liabil...

Page 3: ...rugged compact design utilizing molded case switches to effect the transfer of essential loads from one power source to another Figures 3 4 and 5 Molded case switches are interlocked to prevent both s...

Page 4: ...00 Amperes Manual Transfer Switch Table 2 Transfer Switch Catalog Number Explanation Figure 3 Vertical Design Automatic Transfer Switch Equipment with Deadfront Cover in Place Over Power Panel 225 100...

Page 5: ...affixed to the top of the shipping container which includes a variety of equipment and customer information such as General Order Number GO and Catalog Number Cat Make certain that this information ma...

Page 6: ...stance stack other equipment on top of a transfer switch equipment enclosure whether packaged or not Section 3 Equipment Description 3 1 General Eaton transfer switch equipment is available in four d...

Page 7: ...The switches incorporate pos itive quick make quick break toggle mechanisms and DE IONT arc chutes Vertically mounted switching devices are mechanically and electri cally interlocked to prevent the t...

Page 8: ...Both N E Selectable or Load line 2 DP 4000 Normal or Emergency or Both N E Selectable or Load line 3 Custom metering available contact Eaton 20A Rear Bus Connections Front connected solder less lugs...

Page 9: ...e and or C In legally required standby systems in accordance with article 701 of the National Electrical Code Since Eaton Transfer Switches utilize specially designed molded case switches and or molde...

Page 10: ...ting Procedure All transfer switch equipment enclosures are of the same design Only the overall physical dimensions change The enclosure is provided with four elongated mounting holes two in the top m...

Page 11: ...and set aside in a safe place until mounting is complete Step 2 Install required mounting bolt anchors and the two upper mounting bolts in the mounting surface Step 3 Gently lift the enclosure and gu...

Page 12: ...removed Figure 8 Step 5 The load lug assembly just mentioned is removed by first removing the six or eight bolts securing the pieces of insulated bus to the back of the power panel The num ber of mou...

Page 13: ...glass polyester phase barriers are in place and positioned properly in the grooves provided When making any bolted connection to the bus comply with the torque requirements as outlined in Table 4 Tab...

Page 14: ...holes in the power panel with the pre tapped inserts in the rear of the enclosure Step 10 With the power panel held securely against the back of the enclosure replace and tighten the four mounting bol...

Page 15: ...Step 6 Tighten cable lugs to the torque identified on the label affixed to the unit immediately adjacent to the lugs Step 7 Make necessary connections of options using wiring dia grams and Quick Start...

Page 16: ...600 Vac are provided Figure 9 A small disconnect plug is provided to change from one voltage to another Horizontal Design Voltage Selection Horizontal design transfer switches are furnished with an ad...

Page 17: ...of the handle to open and or close the main contacts Figure 19 The three switch positions Normal Neutral and Emergency are visually indicated on the indi cator wheel Figure 20 To manually operate the...

Page 18: ...individual representing company 6 Basic description of the situation as it exists 7 Any results of the problem solving steps taken and or read ings taken 6 2 1 Transfer Switch Appears In inoperative S...

Page 19: ...rol power is switched off by disconnecting all logic plugs b Inspect structure area for safety hazards or potential maintenance problems Inspect area especially where molded case switching devices are...

Page 20: ...N RECOMMENDATIONS AND DESCRIPTIONS CON TAINED HEREIN In no event will Eaton be responsible to the pur chaser or user in contract in tort including negligence strict liability or otherwise for any spec...

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